DIN rail
DIN or Din or din can have several meanings:* A din is a loud noise.* Dīn, an Arabic term meaning "religion" or "way of life".* Din is one of the ten aspects of the Ein Sof in Kabbalah ....

is a metal rail of a standard type widely used for mounting circuit breaker
Circuit breaker
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow...

s and industrial control equipment inside equipment racks. The term applies to multiple similar standards.

The three major types:
  1. Top hat section, type O, or type Ω, with hat-shaped cross section.
  2. C section
  3. G section

Top hat section / Type O / Type Omega (Ω)

This type of rail was originally standardized by the Deutsches Institut für Normung
Deutsches Institut für Normung
is the German national organization for standardization and is that country's ISO member body. DIN is a Registered German Association headquartered in Berlin...

(DIN), the German national standards organization. The most popular is 35 mm wide.

C section

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

G section

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


In addition to the popular 35 mm x 7.5 mm top-hat rail (EN 50022, BS 5584, DIN 46277-3), several less widely used types of mounting rails have been standardized:
  • Miniature top-hat rail, 15 mm x 5.5 mm (EN 50045, BS 6273, DIN 46277-2);
  • 75 mm wide top-hat rail (EN 50023, BS 5585);

See also

  • 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 Electrotechnical Commission
    The International Electrotechnical Commission is a non-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies – collectively known as "electrotechnology"...

     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
    Standards Australia
    Standards Australia was established in 1922 and is recognised through a Memorandum of Understanding with the Australian government as the peak non-government standards development body in Australia. It is a company limited by guarantee, with 72 members representing groups interested in the...

    AS 2756.1997: Low-voltage switchgear and controlgear - Mounting rails for mechanical support of electrical equipment.
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