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MEAN WELL DIN Rails & DIN Rail Power Supplies

27 November 2019

DIN Rails

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, although 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. The original concept was developed and implemented in Germany in 1928, and was elaborated into the present standards in the 1950s.


There are three major types of DIN rail

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

DIN Rail

This 35-mm wide rail is widely used to mount circuit breakers, relays, programmable logic controllers, motor controllers, and other electrical equipment. The EN 50022 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 / Type O / Type Omega (Ω)

It is known as the TS35 rail in the USA.

C section

These rails are symmetrical within the tolerances given. There are four popular C section rails, C20, C30, C40 and C50. The number suffix corresponds to the overall vertical height of the rail.

DIN Rail - C section

G section

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

DIN Rail G section

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.


DIN Rail Power Supplies

Why use a DIN Rail Power Supply?

Din-rails power supplies are extremely flexible due to the ability to snap on and off din rail mounts thus allowing quick installations. Din-rail power supplies are extremely useful in tight or limited spaces and can be easily re-arranged depending on the application. Less cabling is often used due to other similar units being able to mount next to the power supplies. Most Din-rail power supplies are convection cooled, removing the need for fans.

The most common type of applications for Din Rail AC/DC Power supplies is automation, industrial applications, smart homes, instrumental applications. The most common type of operating devices powered by Din rails power supplies are solenoids, motors, sensors, and relays.

Din-rail Power Supply – Points to consider 

  • Size: check your din-rail is compatible with your din-rail, the most common types are Top Hat, G section and C section.
  • Voltage/Current: Fixed or adjustable - a range of variables to fit any application.
  • Cable and wiring: the less wiring will reduce noise and heat and keep it to a minimum.
  • Efficiency: MEAN WELL Din-rail power supplies have over 89% efficiency making them perfect for your applications.
  • Input Voltage Range: please check your territory to match the required voltage input.


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