Siemens SENTRON 5SM3 series RCCB, 5SM3744-0, 4-pole, type AC, 40 A rated at 40 °C, 400 V AC, 10 kA SCCR, DIN rail mount.
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Product designation | RCCB |
| Product design / construction | Instantaneous |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Maximum | 45 °C |
| Minimum | -5 °C |
| Width | 72 mm |
| Height | 90 mm |
| Depth | 77 mm |
| Installation depth | 70 mm |
| Parameter | Value |
|---|---|
| IP degree of protection | IP20, if the distribution board is installed, with connected conductors |
The Siemens 5SM3744-0 is a SENTRON 5SM3-series residual current circuit breaker (RCCB) — four-pole, type AC, rated 40 A at 40 °C and 400 V AC. The 4-pole design makes it a fit for three-phase plus neutral applications where you need earth-leakage protection on all live conductors.
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.
Snaps onto DIN rail (REG profile). The 77 mm overall depth includes the front projection.
Sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time.
The overall depth is 77 mm; installation depth behind the panel face is 70 mm.
Width is 72 mm, which corresponds to 4 standard DIN-rail width units.
Both are 4-pole RCCBs on DIN rail, but the 5SU9354-7KK16 is a different series with its own terminal layout and depth. Physical fit is not guaranteed without checking the mounting footprint and connection scheme against your panel's wiring.
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