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Siemens 5SM3322-4BG — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3322-4BG RCCB Type B, 25 A, 30 mA, 400 V

MPN5SM3322-4BG

Siemens 5SM3322-4BG residual current operated circuit breaker, 2-pole, type B, short-time delayed, In: 25 A, IΔn: 30 mA, Un AC: 400 V.

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

Product details

Residual current circuit breaker, type B, 25 A, 30 mA

The Siemens 5SM3322-4BG is a 2-pole residual current operated circuit breaker (RCCB) with type B sensitivity, rated at 25 A and 30 mA residual current, for 400 V AC systems. Type B detection means it trips on AC, pulsating DC, and smooth DC fault currents — essential where variable-speed drives, UPS systems, or PV inverters can inject DC into the ground path. The short-time delayed characteristic provides selectivity against downstream RCDs, keeping the upstream device from tripping on a transient fault in a sub-circuit. Mounts on standard DIN rail in a distribution board.

Frequently asked questions

What does the type B sensitivity mean on the 5SM3322-4BG?

Type B detects AC, pulsating DC, and smooth DC residual currents, making it suitable for circuits with frequency converters, UPS systems, or photovoltaic inverters that can produce DC fault currents.

What is the rated voltage and current of the 5SM3322-4BG?

It is rated 25 A (In) at 400 V AC (Un) with a 30 mA residual current sensitivity.

Where can I buy the 5SM3322-4BG?

This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

MPN
5SM3322-4BG