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Siemens 5SM3642-4BG — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3642-4BG RCCB, Type B, 25 A, 300 mA, 400 V

MPN5SM3642-4BG

Siemens 5SM3642-4BG, 4-pole type B residual current circuit breaker, short-time delayed, rated In 25 A, IΔn 300 mA, Un AC 400 V.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Product details

It is rated at 25 A (In) with a 300 mA residual operating current (IΔn) on a 400 V AC supply. The type B characteristic means it detects AC, pulsating DC, and smooth DC fault currents up to 1 kHz — essential for circuits with variable-speed drives, UPS systems, or PV inverters that can generate DC fault components a standard AC/type A RCCB would miss.

Selectivity and coordination

The short-time delay (S-type characteristic) provides selectivity with downstream RCCBs. In a distribution board, a fault on a sub-circuit trips the downstream device first, leaving the 5SM3642-4BG closed and maintaining supply to healthy circuits. This is the standard approach for main-switch or feeder RCCB positions in TN and TT systems.

Frequently asked questions

What is the 5SM3642-4BG used for?

It is a 4-pole type B residual current circuit breaker rated 25 A, 300 mA, 400 V AC, with short-time delay for selectivity. Use it as a main or feeder RCCB in panels supplying equipment that can generate DC fault currents, such as VFDs, UPSs, or EV chargers.

Where can I buy 5SM3642-4BG?

We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SM3642-4BG