DIN rail

Types of DIN Rail
– Top hat section (TH), type O, or type Ω, with hat-shaped cross section
– C section
– G section
– Miniature top-hat rail, 15mm × 5.5mm
– 75mm wide top-hat rail

Top Hat Rail IEC/EN 60715
– Widely used for mounting electrical equipment such as circuit breakers and relays
– Specified in two versions: 35 × 7.5 and 35 × 15
– Also referred to as TH, TH35, Type O, or Type Omega (Ω)
– Known as TS35 rail in the USA
– Module width is commonly used for devices mounted on a 35mm top hat DIN rail

C Section
– Symmetrical rails with four popular variants: C20, C30, C40, and C50
– Number suffix corresponds to the overall vertical height of the rail
– Used for mounting various components

G Section
– G-type rail according to EN 50035, BS 5825, DIN 46277-1
– Designed to hold heavier, higher-power components
– Mounted with the deeper side at the bottom and equipment hooked over the lip
– Equipment clips into the shallower side
– Used for specific applications requiring sturdy mounting

Other Types of Mounting Rails
– In addition to the popular 35mm × 7.5mm top-hat rail, several less widely used types have been standardized
– Includes miniature top-hat rail (15mm × 5.5mm) and 75mm wide top-hat rail
– Each type serves specific purposes and applications Source:  https://en.wikipedia.org/wiki/DIN-rail

DIN rail (Wikipedia)

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.

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.

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.