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Siemens 5SM3644-6BA — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3644-6BA SENTRON RCCB, 4P, 40 A, 300 mA, Type A

MPN5SM3644-6BA

Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A, In: 40 A, IΔn: 300 mA, Un AC: 400 V, DIN rail mount, instantaneous design.

$407.94Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SM3644-6BA — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM3644-6BA — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3644-6BA — Mechanical
ParameterValue
Mounting positionany
Installation depth70 mm
5SM3644-6BA — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

The Siemens 5SM3644-6BA is a 4-pole RCCB from the SENTRON 5SM3 series, rated 40 A and 300 mA trip threshold. Type A detection responds to sinusoidal AC and pulsed DC residual currents. The rated supply voltage is 400 V AC. The 4-pole design switches three phases and neutral.

Installation and wiring constraints

Tightening torque is specified at 2.5 to 3 N·m — use a torque screwdriver; under-torquing raises contact resistance on a 40 A continuous load. Mounting position is unrestricted, and supply can enter from top or bottom, which simplifies busbar routing in crowded enclosures. The IP20 rating applies only with the distribution board installed and conductors connected — the RCCB itself is not touch-safe when removed from the enclosure.

Frequently asked questions

What is 5SM3644-6BA's listed solid and stranded conductor range?

Both solid and stranded conductors from 1.5 mm² up to 25 mm² are accepted by the screw-type terminals.

Will 5SM3644-6BA drop into a panel specified around 5SY4310-7CV without rewiring?

No — the 5SY4310-7CV is a 3-pole MCB (miniature circuit breaker) with a 10 A rating and C-curve trip characteristic, while the 5SM3644-6BA is a 4-pole RCCB at 40 A / 300 mA. They serve different protection functions and are not form-fit interchangeable.

MPN
5SM3644-6BA