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Siemens 5SM3644-0KL — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3644-0KL SENTRON RCCB, 4-pole, 40 A, 300 mA, 400

MPN5SM3644-0KL

Siemens SENTRON 5SM3 RCCB, 4-pole, type AC, 40 A rated, 300 mA residual trip, 400 V AC, 50 Hz, DIN rail mount, instantaneous, N left.

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

Specifications

5SM3644-0KL — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM3644-0KL — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3644-0KL — Mechanical
ParameterValue
Mounting positionany
Maximum25 mm²
Minimum1.5 mm²
Installation depth70 mm
5SM3644-0KL — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

RCCB for panel builders and spares planners

The Siemens 5SM3644-0KL is a 4-pole SENTRON RCCB, type AC, rated 40 A with a 300 mA residual trip at 400 V AC, 50 Hz. This is an instantaneous-trip RCCB. It trips when residual current exceeds 300 mA. It handles AC fault currents only.

Installation notes

Mounts in any position on DIN rail. Power supply can feed from top or bottom. Accepts conductors from 1.5 mm² to 25 mm² — the 25 mm² maximum covers most feeder and subfeed sizes in a distribution board. Silicon-free construction avoids outgassing issues in sensitive environments. The test circuit requires at least 100 V AC to function.

Frequently asked questions

What is the maximum conductor size for 5SM3644-0KL?

The maximum conductor cross-section is 25 mm². The minimum is 1.5 mm².

Where can I buy 5SM3644-0KL and how is it quoted?

We source the 5SM3644-0KL to order against an RFQ. Submit a request with your quantity and target delivery window; we confirm availability and current pricing at quote time. Volume and tender pricing is available.

MPN
5SM3644-0KL