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DIN rail
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A front view of a populated 35 mm DIN rail
Rear view. Note the release loops at the top of the mounted devices which unclip them.

A DIN rail is a metal rail of a standard type widely used for mounting circuit breakers and industrial control equipment inside equipment racks. These products are typically made from cold rolled carbon steel sheet with a zinc-plated or chromated bright surface finish. Although metallic, they are meant only for mechanical support and are not used as a busbar to conduct electric current, though they may provide a chassis grounding connection.

The term derives from the original specifications published by Deutsches Institut für Normung (DIN) in Germany, which have since been adopted as European (EN) and international (IEC) standards.[1] The original concept was developed and implemented in Germany in 1928, and was elaborated into the present standards in the 1950s.[2]

Types

[edit]

There are three major types of DIN rail:[3]

  • Top hat section (TH), type O, or type Ω, with hat-shaped cross section.
  • C section
  • G section

Top hat rail IEC/EN 60715

[edit]

This 35 mm wide rail is widely used to mount circuit breakers, relays, programmable logic controllers, motor controllers, and other electrical equipment. The EN 60715 standard specifies both a 7.5 mm (shown above) and a 15 mm deep version, which are officially designated

  • top hat rail IEC/EN 60715 – 35 × 7.5
  • top hat rail IEC/EN 60715 – 35 × 15

Some manufacturers catalogues also use the terms: Top hat section / TH / TH35 (for 35mm wide) / Type O / Type Omega (Ω).[citation needed]

The rail is known as the TS35 rail in the USA.[citation needed]

Module width

[edit]

The width of devices that are mounted on a 35 mm "top hat" DIN rail generally use "modules" as a width unit, one module being 18 mm wide. For example, a small device (e.g. a circuit breaker) may have a width of 1 module (18 mm wide), while a larger device may have a width of 4 modules (4 × 18 mm = 72 mm). Equipment enclosures also follow these module widths, so an enclosure with a DIN rail may have space for 20 modules, for example. Not all devices follow these module widths. [citation needed]

Module widths are usually abbreviated as "M" (e.g. 4M = 4 modules) [citation needed]. Some manufacturers (including Mean Well) use "SU" (likely stands for "standard unit", e.g. 4SU = 4 modules) [citation needed].

C section

[edit]

These rails are symmetrical within the tolerances given and referenced by the norm EN 50024 (abrogated). There are four popular C section rails, C20, C30, C40 and C50. The number suffix corresponds to the overall vertical height of the rail.

G section

[edit]
Cross section view of a G-type DIN rail, with electrical equipment mounted on it

G-type rail (according to EN 50035 (abrogated), BS 5825, DIN 46277-1).

G rail is generally used to hold heavier, higher-power components. It is mounted with the deeper side at the bottom, and equipment is hooked over the lip, then rotated until it clips into the shallower side.

Others

[edit]

In addition to the popular 35 mm × 7.5 mm top-hat rail (EN 50022, BS 5584, DIN 46277-3), several less widely used types of mounting rails have also been standardized:

  • Miniature top-hat rail, 15 mm × 5.5 mm (EN 50045, BS 6273, DIN 46277-2);
  • 75 mm wide top-hat rail (EN 50023, BS 5585);
[edit]
  • European Standard EN 50022: Specification for low voltage switchgear and control-gear for industrial use. Mounting rails. Top hat rails 35 mm wide for snap-on mounting of equipment. (formerly: German Standard DIN 46277, British Standard BS 5584)
  • IEC International Standard 60715: Dimensions of low-voltage switchgear and control-gear. Standardized mounting on rails for mechanical support of electrical devices in switchgear and control-gear installations.
  • Australian Standard AS 2756.1997: Low-voltage switchgear and controlgear - Mounting rails for mechanical support of electrical equipment.

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

DIN rail

View on Grokipedia
from Grokipedia
A DIN rail is a standardized metal mounting rail designed for the mechanical support of low-voltage , controlgear, and accessories in electrical enclosures and control panels. It features a specific cross-sectional profile that allows devices to snap on and off securely, facilitating modular installation and . The DIN rail originated in in 1928 as a collaborative project between the Phoenix Electrical Supply Company (now ) and the Rhenish-Westphalian Electric Company () to address the need for uniform mounting solutions in industrial electrical systems. Initially developed to standardize terminal block installations amid inconsistent practices, it evolved through German DIN standards before being adopted internationally under the IEC 60715 designation in 1981, with updates in subsequent editions like the 2017 version to refine dimensions and compatibility. Key types of DIN rails specified in IEC/EN 60715 include the (TH) profile, the most common for general applications, along with C-section and G-section variants for specialized uses. The standard TH35 top hat rail measures 35 mm wide by 7.5 mm or 15 mm high, with tolerances of ±0.3 mm on width, while wider options like TH75 reach 75 mm for heavier loads; materials are typically cold-rolled zinc-plated with a tensile strength of 320–420 N/mm² to ensure rigidity under static and dynamic stresses. These rails, often supplied in 2-meter lengths, support a wide array of components including relays, timers, power supplies, and modules in industrial, building, and machinery control environments.

Overview

Definition and purpose

A DIN rail is a standardized metal rail used for mounting electrical components such as circuit breakers, terminal blocks, relays, and power supplies within enclosures. The (IEC) standard 60715 specifies dimensional and functional requirements for these rails to ensure compatible mounting of low-voltage , controlgear, and accessories. This standardization supports mechanical fixation in electrical panels, promoting reliability in industrial and control applications. The primary purpose of a DIN rail is to offer a secure, modular, and easily accessible framework for organizing and installing control equipment in panels and racks. By providing a consistent mounting base, it facilitates the assembly of complex systems while allowing for straightforward reconfiguration or expansion as needed. Key benefits include enabling quick snap-on installation, optimizing space efficiency in enclosures, and ensuring broad compatibility across components from various manufacturers. This universal approach reduces installation time and maintenance costs in electrical systems. Typically, a DIN rail features a perforated or solid metal strip with a specific cross-sectional profile engineered for clip-on attachment of devices.

History and development

The DIN rail originated in during the late 1920s, specifically around 1928, as a standardized metal strip designed to mount electrical control devices and terminal blocks in industrial panels. This innovation stemmed from collaborative efforts between the Phoenix Electrical Supply Company (now Phoenix Contact) and the Rhenish-Westphalian Electric Company () to address the need for reliable, uniform assembly in growing electrical systems. The (DIN), established in 1917 to foster technical standardization across industries, championed the concept to enhance efficiency in applications. Post-World War II industrial reconstruction and the surge in requirements accelerated the rail's development, creating demand for a consistent framework to support modular electrical installations in and control environments. By the , DIN formalized the standard through DIN 46277, which outlined essential profiles and tolerances; a key part, DIN 46277-3 published in 1970, specified dimensions that became foundational for compatibility across components. This standardization addressed the complexities of expanding relay-based and early electronic systems, enabling quicker assembly and maintenance in control cabinets. The and marked a pivotal evolution, driven by breakthroughs in modular and the introduction of programmable logic controllers (PLCs), which necessitated versatile, snap-on mounting for compact hardware. To achieve global interoperability, the DIN standard transitioned to international frameworks, with IEC 60715 first issued in 1981 and harmonized as EN 60715 in 2001, broadening adoption beyond in sectors like and transportation. These changes reflected the rail's role in supporting scalable, wiring-efficient designs amid rising industrial . In 2017, IEC/EN 60715 underwent a significant revision to refine dimensional and functional requirements, including provisions for protective and updated loading capacities, while accommodating material innovations such as lightweight variants for enhanced durability and reduced weight. This update promotes with modern accessories and aligns with broader trends toward efficient, eco-friendly electrical infrastructure without altering core profiles.

Standards and specifications

Governing standards

The primary standards governing DIN rails originated with the German standard DIN 46277, introduced in the 1970s to define mounting rails for electrical equipment in control panels and assemblies. This standard, particularly DIN 46277-3 published in 1970, established initial dimensions and profiles for symmetrical and asymmetrical rails, ensuring compatibility in industrial applications. It served as the foundation for subsequent international harmonization, influencing European norms like EN 50022, which was later superseded by EN 60715. DIN 46277 has been largely superseded by the IEC 60715, which was adopted as the European norm EN 60715 through processes. Developed by the (IEC) Technical Committee 121, Subcommittee 121A on low-voltage switchgear and controlgear, and approved by the (CENELEC) as a , IEC/EN 60715 provides a global framework while aligning with national bodies such as the Deutsches Institut für Normung (DIN) in . This transition reflects efforts to standardize rail specifications beyond regional boundaries, promoting interoperability in electrical installations worldwide. The scope of IEC/EN 60715 encompasses dimensional and functional requirements for the mounting of low-voltage , controlgear, and accessories on , C-section, and G-section rails, applicable to assemblies operating at voltages up to 1000 V AC or 1500 V DC. It addresses critical aspects such as rail profiles, tolerances (e.g., ±0.3 mm for common 35 mm rails), load-bearing capacities to ensure mechanical stability under specified support conditions, and guidelines for verifying stiffness and deflection to prevent equipment failure. While the standard does not prescribe detailed testing protocols, it emphasizes manufacturer responsibility for demonstrating compliance through empirical validation of strength and compatibility, supporting safe operation in demanding environments. Compliance with these standards is enforced through mandatory safety certifications to mitigate risks in electrical systems. In , Underwriters Laboratories (UL) certification verifies adherence to safety norms, including evaluations for electrical shock prevention and material integrity under stress. In the , CE marking is required, confirming conformity with essential health, safety, and environmental protection directives, often incorporating tests for vibration resistance (e.g., per IEC 60068 series for mechanical robustness) and fire safety (e.g., resistance to flame propagation under UL 94 or equivalent). These certifications ensure DIN rails withstand operational hazards like seismic activity or thermal events without compromising system reliability. The current edition, IEC 60715:2017 published in July 2017, represents the latest revision, refining earlier versions (such as the 1981 edition) to incorporate advancements in manufacturing precision and performance expectations. This edition remains current as of 2025. This update aligns with broader regulatory evolution, including the Restriction of Hazardous Substances (RoHS) Directive 2011/65/EU, which mandates limits on materials like lead and in electrical components to address environmental concerns. Manufacturers must select compliant materials during production to meet these intertwined requirements, ensuring DIN rails support sustainable practices without altering core dimensional or functional specifications.

Dimensions and profiles

DIN rails are standardized mounting systems with specific dimensions to ensure compatibility across electrical and control equipment. The most common rail width is 35 mm, designated as TS 35 per IEC 60715, which supports a wide range of modular components. Other standard widths include 32 mm (TS 32, often used in G-section profiles) and 15 mm (TH15, for miniature applications), all defined with tight tolerances such as ±0.3 mm for the 35 mm variant to maintain precise fitting. Heights for top hat profiles vary, such as 7.5 mm (TH35-7.5) or 15 mm (TH35-15) for the 35 mm width. These widths form the basis for profiles like the design, allowing uniform mounting. Rails are typically supplied in lengths of 1 to 2 meters, which can be cut to custom sizes for specific panel requirements, and perforation options—such as evenly spaced holes every 25 —are available to facilitate secure mounting to enclosures without additional . Load capacities vary by profile and support spacing, reaching up to approximately 20 kg per meter for standard steel TS 35 rails under typical conditions, with the IEC/EN 60715 standard specifying bending tolerances like a maximum deflection of 1 under defined loads to ensure structural integrity. Profile variations include symmetrical designs, such as the top hat (TH) sections with balanced cross-sections for easy bidirectional mounting, and asymmetrical ones like G-sections that provide enhanced stability for heavier loads by preventing incorrect orientation. Some profiles incorporate slotting or perforations to accommodate end stops for securing components or grounding connections, enhancing safety and organization in assemblies. A key feature is the module width system, based on a 17.5 mm grid that standardizes component spacing for precise alignment and interchangeability in control panels, as adopted in equipment compliant with related standards like EN/IEC 60947-2. This grid enables efficient layout of devices such as circuit breakers and relays without gaps or overlaps.

Types

Top hat rails

The top hat rail, also known as the Ω or O type due to its distinctive hat-shaped cross-section, serves as the most prevalent DIN rail profile for mounting electrical components. This design features a flat base with upward-extending parallel , providing a secure lip for device attachment. Standardized under IEC/EN 60715, the primary dimensions include a 35 mm width across the base and flange heights of either 7.5 mm or 15 mm, enabling compatibility with a broad range of enclosures and equipment. Subtypes of top hat rails adhere to the TH35 designations in IEC/EN 60715 and are symmetrical, allowing bidirectional mounting of components without orientation restrictions, which simplifies installation in control panels. Examples include TH35-7.5 (height 7.5 mm) and TH35-15 (height 15 mm). Key advantages of top hat rails include their high structural stability, which supports heavier components without deformation, an intuitive snap-on and snap-off mechanism for rapid device installation and removal, and extensive availability across global suppliers due to their standardization. These rails are particularly suited for standard industrial circuit breakers, relays, and terminal blocks, where the profile's rigidity ensures reliable performance in vibration-prone environments. Typical load ratings reach up to 15 kg per meter without sagging, depending on material thickness and support spacing, making them ideal for densely populated panels. Variations such as perforated top hat rails incorporate evenly spaced holes along the base, facilitating flexible positioning and direct mounting to surfaces via screws or bolts while retaining the core hat profile for device latching. These perforated options enhance versatility in custom layouts without compromising the rail's primary function. In comparison to less common profiles like C-section or G-section rails, top hat rails offer broader applicability for general-purpose industrial setups.

C-section and G-section rails

The C-section rail, designated as type C under the IEC/EN 60715 standard, features an open-sided, channel-like profile that enables improved side access for wiring and secure mounting via sliding nuts or bolts. Available in variants such as C20 (width 20 mm, height 11 mm), C30 (width 30 mm, height 15 mm), C40 (width 40 mm, height 18 mm), and C50 (width 50 mm, height 22 mm), these rails support heavier loads in custom enclosures or industrial applications requiring robustness, particularly in vibration-prone environments due to their emphasis on form tolerances for torsional strength. Although less prevalent in contemporary designs compared to rails, C-section profiles persist for legacy system compatibility. The G-section rail, type G per IEC/EN 60715, serves as a miniature alternative with a height of 15.5 mm, width of 32 mm, optimized for compact panels in space-constrained setups. This asymmetrical G-shaped profile facilitates snap-on mounting for terminal blocks and lighter components, offering space savings in high-density installations while maintaining adequate torsional strength for its scale, though with reduced load-bearing capacity relative to larger profiles. Like the C-section, it is retained primarily for compatibility with existing equipment in electrical .

Materials and construction

Common materials

The primary material used in the production of DIN rails is cold-rolled galvanized , which features a coating to enhance resistance and represents the most economical choice for standard applications. This provides robust mechanical , including a tensile strength of 320–420 MPa, and a of approximately 7.8 g/cm³, enabling it to support heavy loads while maintaining structural integrity in typical industrial settings. For more demanding conditions, alternatives such as in AISI 304 or 316 grades are employed, offering superior resistance to in harsh environments like marine or chemical facilities. Aluminum serves as a lightweight option with a of about 2.7 g/cm³, which reduces overall weight and provides non-magnetic characteristics beneficial for applications involving sensitive electronic components. To further improve durability, DIN rails may receive additional treatments like or passivation, alongside RoHS-compliant formulations that restrict substances such as lead and . Material selection is guided by considerations of cost, electrical conductivity, and resilience to environmental stressors, including moisture and temperatures typically ranging from -40°C to +150°C.

Manufacturing processes

The primary manufacturing process for DIN rails, particularly those made from , is cold . This method involves feeding a continuous strip of coil through a series of precisely engineered rollers and dies that progressively shape the material into the desired profile, such as the top hat or C-section, at ambient temperatures without the need for heating. The process ensures high precision and efficiency, producing uniform cross-sections while minimizing material waste through continuous operation. Secondary processes follow to customize the rails for specific applications. Slitting cuts the coil stock to the required width before forming, while perforating introduces holes or slots along the length for mounting or ventilation purposes in perforated variants. For corrosion resistance, especially in rails, zinc galvanization is applied either through hot-dip immersion in molten for thicker coatings or for thinner, more uniform layers. Quality control in DIN rail production adheres to ISO 9001 standards, encompassing rigorous dimensional inspections to verify compliance with specifications. Key checks include straightness, with deviations limited to less than 0.5 mm per meter, and surface finish to ensure smooth mounting and durability. Modern production incorporates automation via high-speed roll forming lines capable of outputting up to 100 meters per minute, enabling large-scale manufacturing with consistent quality. Sustainability is enhanced through scrap recycling, as excess metal trimmings from forming and cutting are collected and reused in steel production cycles, supporting circular economy practices. For aluminum DIN rails, the primary variation employs , where heated aluminum billets are forced through a die to create seamless profiles, offering advantages in lightweight construction and corrosion resistance without additional forming steps.

Applications and uses

Electrical and control systems

DIN rails play a central role in electrical panel design and control circuitry by providing a standardized mounting platform that enhances and organization within enclosures. They facilitate the secure attachment of essential components such as terminal blocks, fuse holders, and DIN rail-mounted power supplies in distribution boards, enabling efficient wiring and power distribution in control systems. The modularity of DIN rails is exemplified by the 17.5 mm grid system, which allows for the precise stacking and alignment of multi-channel devices, including (I/O) modules in (PLC) systems, optimizing space and simplifying expansions or modifications. This grid-based design supports low-voltage applications operating at less than 1000 V AC or DC, making DIN rails integral to setups, (HVAC) controls, and systems where compact, reliable integration is essential. In assemblies compliant with IEC 61439, DIN rails enable quick reconfiguration during by allowing easy removal and replacement of components without disrupting the entire panel, thereby minimizing in electrical systems. Additionally, DIN rails contribute to by serving as grounding paths that ensure protective connections for mounted devices and providing physical isolation between components to prevent unintended electrical interactions.

Industrial and automation environments

In industrial and automation environments, DIN rails serve as a standardized mounting platform within control cabinets for manufacturing lines, , and systems, where they support the organization and connection of sensors, actuators, and programmable logic controllers (PLCs). These rails enable modular assembly of components essential for process monitoring and control, facilitating quick reconfiguration and maintenance in high-throughput production settings. For instance, in robotic assembly lines, DIN rails secure interface modules that handle from multiple sensors to ensure precise . To withstand demanding conditions, DIN rails are adapted for harsh environments through vibration-resistant designs and integration into IP-rated enclosures, commonly used in automotive assembly plants and oil and gas facilities. Vibration-proof rails, often made from galvanized or aluminum, maintain structural integrity under mechanical stress, preventing component dislodgement during operations like heavy machinery or seismic activity in extraction sites. IP65 or higher enclosures housing DIN-mounted devices protect against dust, , and moisture ingress, ensuring reliable performance in corrosive or atmospheres. Scalability is achieved with DIN rails available in extended lengths up to 3 meters, suitable for large control panels in power plants or conveyor systems, allowing dense mounting of multiple devices without segmentation. This design supports expansive layouts for distributed control, such as in utility-scale or , where continuous rails simplify wiring and expansion. Emerging trends involve DIN rails' integration with (IoT) devices in smart factories under Industry 4.0 frameworks, where they mount modules for real-time data analytics and . These setups enable seamless connectivity between legacy hardware and cloud-based systems, enhancing operational efficiency in cyber-physical production environments. A representative example is the mounting of variable frequency drives (VFDs) on DIN rails in centers, which regulate speed and for industrial motors in conveyor or systems, optimizing use and reducing wear. This configuration allows for compact, accessible installation in enclosed panels, supporting fault-tolerant operations in continuous processes.

Mounting and accessories

Installation techniques

DIN rails are typically secured within electrical enclosures using basic mounting methods that involve fixing the rail to the enclosure's backplate or mounting surface. This is achieved by holes in the rail or utilizing pre-existing elongated slots, then fastening with or rivets at intervals of 100-200 mm to ensure structural integrity under load. Common screw sizes range from M4 to M6, providing sufficient holding power for standard applications, while rivets offer a permanent alternative for non-adjustable setups. Essential tools for installation include rail cutters for precise sizing to fit enclosure dimensions and torque wrenches to apply consistent fastening torque, typically 0.8-2 Nm for M4-M5 screws and up to 5 Nm for M6 screws, as per manufacturer guidelines to prevent damage. A spirit level is used to verify horizontal alignment, ensuring even distribution of mounted components and avoiding stress on connections. End clamps are recommended at both extremities of the rail to inhibit slippage, particularly in vibrating environments, by snapping or screwing them into place. Best practices emphasize secure and level installation to maintain reliability; for instance, rails should be mounted with washers and grommets under screws for resistance, and multiple rails in parallel setups must align precisely to facilitate wiring. In temporary or non-drilled scenarios, adhesive-backed DIN rails provide a quick, non-invasive option, though they are less suitable for heavy-duty use. For safety, the rail assembly must be grounded according to Article 250 or guidelines to mitigate and ensure fault protection, often by attaching a ground wire directly to a mounting or dedicated grounding point on the rail.

Compatible components

DIN rails are designed to accommodate a wide array of electrical and electronic components that feature standardized mounting mechanisms, ensuring secure and efficient installation in control panels and enclosures. Standard components include miniature circuit breakers compliant with IEC 60898-1, which snap onto the rail to provide protection in residential, commercial, and industrial settings. Relays, such as terminal block relays rated for higher continuous loads, mount directly via DIN rail clips to control solenoids, pilot devices, and PLC outputs. Timers, including multifunctional DIN rail mountable units, offer precise time-delay functions for sequences and are available in compact 17.5 mm widths. Surge protectors, such as Type 1 and Type 2 devices, utilize snap-fit bases for quick attachment and protect against transient overvoltages in compliance with IEC standards. Advanced devices extend the rail's utility to more complex systems, including DIN rail enclosures for printed circuit boards (PCBs) that adhere to DIN 43880 dimensions for modular integration in control cabinets. Signal conditioners, mounted via DIN rail adapters, convert and isolate inputs like voltage, current, or frequency to standardized outputs for process control applications. Ethernet switches, both managed and unmanaged, support industrial networking with Gigabit speeds and PoE capabilities, clipping onto the rail for robust connectivity in harsh environments. Interoperability across manufacturers is facilitated by universal clip systems defined in IEC/EN 60715, which standardize the 35 mm top-hat rail profile for snap-on mounting without proprietary adapters. Additionally, DIN 43880 specifies dimensions for terminal blocks, ensuring consistent widths (e.g., 17.5 mm per module) and heights above the rail (up to 44 mm) for seamless side-by-side installation. Accessories enhance functionality and organization, such as jumpers that bridge multiple terminal blocks for common potential distribution. Markers, often in strip form for application, provide clear labeling of circuits to aid . DIN rail fuses, held in dedicated terminal blocks accepting 5x20 mm cartridges, offer localized protection rated up to 15 A and 300 V. To preserve structural integrity, components are limited to lightweight designs, typically 0.5-2 kg per device, as rails support 15-20 kg per meter overall depending on material and mounting.

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  72. https://www.eaton.com/us/en-us/catalog/machinery-controls/terminal-block-relays.html
  73. https://imoautomation.com/imo_us_usd_view/products/relays-timers/timers/din-rail-mount-timers.html
  74. https://www.digikey.com/en/blog/din-rail-mountable-surge-protection-devices-type-1-and-type-2
  75. https://www.bopla.de/en/company/bopla-news/news/new-din-rail-enclosure-according-to-din-43880
  76. https://www.phoenixcontact.com/en-pc/products/signal-conditioners-and-measuring-transducers
  77. https://www.phoenixcontact.com/en-us/products/industrial-communication/industrial-ethernet-switches
  78. https://docs.rs-online.com/2ff5/A700000006685106.pdf
  79. https://www.wago.com/global/c/rail-mount-terminal-blocks
  80. https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/terminal-blocks-fuse-blocks-and-fuse-holders-v7-t8-ca08100008e.pdf
  81. https://www.dwyeromega.com/en-us/din-rail-fuse-terminal-blocks-for-5-x-20-mm-fuse-single-circuit/p/OMTBV7-WFB
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