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Siemens 5SM3444-0 — Residual Current Breakers (RCCB/RCBO)

Siemens SENTRON 5SM3444-0 RCCB, 4-pole, 40 A, 400 V, 10 kA

MPN5SM3444-0

Siemens SENTRON 5SM3 series RCCB, 4-pole, 40 A rated at 400 V AC, 10 kA short-circuit current rating, 50 Hz, DIN rail mount, instantaneous type, IP20.

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

Specifications

5SM3444-0 — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM3444-0 — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3444-0 — Mechanical
ParameterValue
Mounting positionany
Maximum45 °C
Minimum-5 °C
Width72 mm
Height90 mm
Depth77 mm
Installation depth70 mm
5SM3444-0 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

The Siemens SENTRON 5SM3444-0 is a 4-pole residual current circuit breaker (RCCB) rated for 40 A at 400 V AC, 50 Hz.

The 40 A rating holds at ambient up to 45 °C. Above that, the current must be derated: 37.6 A at 50 °C, 35.2 A at 55 °C, 32.8 A at 60 °C, 30.4 A at 65 °C, and 28 A at 70 °C. If the distribution board runs warm — common in densely packed enclosures — the actual trip threshold shifts. Plan the load circuit against the derated figure for the expected cabinet temperature, not the nameplate 40 A.

Installation notes

Mounts on DIN rail (REG) in any position. IP20 applies only when the distribution board is installed with connected conductors; the front terminals are finger and back-of-hand safe. Overvoltage category III suits fixed-installation mains.

Frequently asked questions

What is the closest functional second-source for 5SM3444-0?

The Siemens 5SU9354-7KK16 is a different series (5SU9 vs 5SM3) and carries different ratings — verify the specific pole count, current, and voltage before substituting. The 5SM3444-0 is a 4-pole, 40 A, 400 V AC, 50 Hz, instantaneous RCCB; the 5SU9 series may differ in width or trip characteristic. A direct drop-in replacement without rewiring is not guaranteed.

Where can I buy 5SM3444-0?

The part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment.

What compliance documentation does Siemens provide for 5SM3444-0?

The part carries the SENTRON brand and is designed to EN 61346-2 (designation F) and EN 81346-2 (designation F). It is silicon-free. For RoHS, REACH, and UL declarations, request the manufacturer's compliance documentation at quote time — these are typically available per batch.

MPN
5SM3444-0