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Siemens 5SM3642-0 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3642-0 SENTRON RCCB, 4P, 25A, 300mA, 10kA

MPN5SM3642-0

Siemens SENTRON 5SM3 series RCCB, 4-pole, 25 A rated current, 300 mA residual trip, 10 kA short-circuit rating, 400 V AC, DIN rail mount.

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

Specifications

5SM3642-0 — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM3642-0 — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3642-0 — Mechanical
ParameterValue
Mounting positionany
Width72 mm
Height90 mm
Depth77 mm
Installation depth70 mm
5SM3642-0 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

The Siemens 5SM3642-0 is a 4-pole SENTRON residual-current circuit breaker (RCCB) rated for 25 A at 400 V AC, 50 Hz, with a 300 mA residual trip threshold and a 10 kA short-circuit current rating. It's an instantaneous type (no short-time delay), designed for AC fault currents only.

Mounting position is unrestricted, but ambient must stay between -5 and +45 °C. The IP20 rating applies only when the distribution board is installed with conductors connected — bare terminals are finger-safe per the finger and back-of-hand protection spec.

Above that, it derates linearly: 24 A at 50 °C, 23 A at 55 °C, 22 A at 60 °C, 21 A at 65 °C, and 20 A at 70 °C. The storage range of -40 to +75 °C is broader; that's for shelf life, not running.

Frequently asked questions

Where can I buy 5SM3642-0 and what is the lead time?

Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here.

What is 5SM3642-0's depth and how does it fit in a panel?

Overall depth is 77 mm; installation depth (behind the panel face) is 70 mm. The extra 7 mm is terminal clearance for the 1.5–25 mm² conductors. It occupies 4 width units (72 mm) on standard DIN rail.

What does the 300 mA trip rating mean for this RCCB?

The 300 mA residual trip is a protection level for equipment and fire prevention, not personnel shock protection (which typically requires 30 mA or lower). It's suited for circuits where nuisance tripping from leakage currents is a concern — motor drives, long cable runs, or industrial machinery.

MPN
5SM3642-0