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Siemens 5SM3324-4 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3324-4 SENTRON RCCB, 40 A, 30 mA, Type B

MPN5SM3324-4

Siemens SENTRON RCCB, 2-pole, Type B, short-time delayed, 40 A, 30 mA, 230 V AC, 10 kA SCCR, DIN rail mount.

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

Specifications

5SM3324-4 — Electrical Ratings
ParameterValue
Number of poles2
Overvoltage categoryIII
5SM3324-4 — Identification
ParameterValue
Product designationRCCB
Product design / constructionShort-time delayed
5SM3324-4 — Mechanical
ParameterValue
Mounting positionany
Width in modular units4
Maximum45 °C
Minimum-25 °C
Width72 mm
Height90 mm
Depth70 mm
Installation depth70 mm
5SM3324-4 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

RCCB for universal-current-sensitive protection

The Siemens 5SM3324-4 is a 2-pole SENTRON residual current circuit breaker (RCCB) rated 40 A at 230 V AC, with a 30 mA trip threshold and Type B residual current characteristic. Type B means it detects smooth DC fault currents in addition to AC and pulsed DC — essential for circuits feeding variable-frequency drives, UPS systems, or EV charging equipment where pure AC-sensing RCCBs would miss a DC fault. The short-time delayed design (S-type) provides selectivity: it withstands transient earth-leakage surges up to 3 kA (8/20 µs) without nuisance tripping, coordinating with downstream RCCBs so only the faulted branch clears.

Depth of 70 mm (installation depth 70 mm) leaves clearance for wiring gutters in a typical 120 mm deep enclosure. The silicon-free construction avoids outgassing issues in sealed cabinets with sensitive electronics.

Frequently asked questions

What is the 5SM3324-4 used for?

It is a 2-pole Type B RCCB (residual current circuit breaker) rated 40 A, 30 mA, 230 V AC, short-time delayed. It protects circuits against earth faults including smooth DC, making it suitable for VFD, UPS, and EVSE installations where standard AC/Type A RCCBs may not detect DC fault currents.

Where can I buy the 5SM3324-4?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response.

MPN
5SM3324-4