Siemens SENTRON 5SQ series, miniature circuit breaker, 1-pole, C-curve, 4 A, 3 kA per EN 60898, 240 VAC, 50 Hz, IP20.
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Number of poles | 1 |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Rated value (EN 60898) | 3 kA |
| Overvoltage category | 3 |
| Parameter | Value |
|---|---|
| Installation depth | 55 mm |
| Parameter | Value |
|---|---|
| IP protection class | IP20 |
| Parameter | Value |
|---|---|
| Type of voltage | AC/DC |
| Energy limiting class | 3 |
| Number of width units | 1 |
| Number of poles (Note) | 1P |
| Circuit-breaker (Design) | 5SQ |
| Current (at AC) | 4 A |
| Supply voltage (at AC) | 240 V |
| Supply voltage frequency | 50 Hz |
| Product function (neutral conductor switching) | No |
The Siemens SENTRON 5SQ2170-0KA04 is a 1-pole miniature circuit breaker with a C-curve tripping characteristic, rated 4 A at 240 VAC, 50 Hz. Rated for AC/DC operation, it fits both AC distribution panels and DC branch circuits at the same current, though the voltage rating on DC side follows the manufacturer's derating curve — something to check if you're wiring a 48 VDC telecom bay.
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It is a 1-pole (1P) breaker, occupying a single width unit on the DIN rail.
Yes — both are 1-pole, 55 mm deep, same SENTRON 5SQ platform and IP20 rating. The 2YA15 is a 1.6 A variant; swapping to the 4 A 0KA04 only changes the overcurrent threshold, not the footprint or wiring.
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