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Siemens 5SM3444-6 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM3444-6 SENTRON RCCB, 4P, 40 A, 400 V, Type A, 10

MPN5SM3444-6

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

$395.22Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SM3444-6 — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM3444-6 — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3444-6 — Mechanical
ParameterValue
Mounting positionany
Maximum45 °C
Minimum-25 °C
Width72 mm
Height90 mm
Depth77 mm
Installation depth70 mm
5SM3444-6 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

RCCB for 400 V AC panels — 40 A, Type A, 10 kA

The Siemens 5SM3444-6 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON 5SM3 series, rated 40 A at 400 V AC, 50 Hz. It detects Type A fault currents (pulsating DC and sinusoidal AC) and trips instantaneously — no short-time delay.

Full 40 A rating holds up to 45 °C ambient. Above that, current must be derated linearly: 37.6 A at 50 °C, 35.2 A at 55 °C, 32.8 A at 60 °C, 30.4 A at 65 °C, 28 A at 70 °C. If the panel runs hot — near a drive cabinet or in a non-conditioned enclosure — check the derated value against your load.

Snaps onto DIN rail (REG profile), any mounting position. Finger and back-of-hand safe per the shock protection class.

Frequently asked questions

How do I get current pricing and availability for 5SM3444-6?

Submit an RFQ through this listing; availability and current pricing are confirmed at quote time through independent distribution channels.

What is the depth of 5SM3444-6?

Overall depth is 77 mm; installation depth (behind the panel face) is 70 mm.

What is the width of 5SM3444-6?

72 mm, which corresponds to 4 width units on a standard DIN-rail panel.

Will 5SM3444-6 drop into a panel specified around 5SY4304-7CV without rewiring?

Both are 4-pole DIN-rail RCCBs, but the 5SY4304-7CV is a 4 A unit (different current rating) — verify your load and coordination before substituting. Footprint and mounting are compatible.

MPN
5SM3444-6