Skip to main content
Log in
Siemens 5SM1344-6 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM1344-6 SENTRON RCCB, 4-pole, 40 A, 30 mA, Type A,

MPN5SM1344-6

Siemens SENTRON 5SM1344-6 RCCB, 4-pole, 40 A, 30 mA, Type A, 10 kA, 50 Hz, IP20, DIN rail.

$811.97Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SM1344-6 — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII
5SM1344-6 — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM1344-6 — Mechanical
ParameterValue
Mounting positionany
Width in modular units4
Maximum45 °C
Minimum-25 °C
Installation depth55 mm
5SM1344-6 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors
5SM1344-6 — Electrical
ParameterValue
Operational current / at AC / rated value40 A

Product details

What this 4-pole RCCB delivers

The Siemens SENTRON 5SM1344-6 is a 4-pole residual current circuit breaker (RCCB) rated 40 A at 40 °C and 45 °C, tripping at 30 mA residual current, Type A (pulsating DC and sinusoidal AC).

Snaps onto DIN rail (REG) and occupies 4 modular width units. Installation depth is 55 mm. Mounting position is any. Supply can enter from top or bottom.

Thermal derating and ambient limits

The 5SM1344-6 holds its full 40 A rating up to 45 °C ambient. Above that, it derates linearly: 38.4 A at 50 °C, 36.8 A at 55 °C, 35.2 A at 60 °C, 33.6 A at 65 °C, and 32 A at 70 °C. The maximum permissible ambient is 60 °C (storage up to -40 °C). If your panel runs hot — near a transformer or in a non-ventilated enclosure — factor in the derating curve so the RCCB doesn't nuisance-trip on thermal overload.

Frequently asked questions

What is the 5SM1344-6's maximum ambient temperature rating?

The maximum operating ambient is 45 °C at full rated current (40 A). The maximum permissible ambient (non-operating storage) is 60 °C.

What is the 5SM1344-6's minimum ambient temperature rating?

The minimum operating ambient is -25 °C. The minimum permissible storage temperature is -40 °C.

Will the 5SM1344-6 drop into a panel specified around the 5SJ6325-7RC?

Both are 4-pole RCCBs on DIN rail, but the 5SM1344-6 is a Type A (30 mA, 40 A) with 10 kA SCCR, while the 5SJ6325-7RC is a different rating and type. Check the specific residual current, rated current, and breaking capacity of your existing specification before swapping — the footprint is the same, but the protection characteristics differ.

MPN
5SM1344-6