Siemens SENTRON 5SY3 series, miniature circuit breaker (MCB), 2-pole, 50 A, C-curve, 400 VAC, 4.5 kA (EN 60898) / 6 kA (IEC 60947-2).
| Parameter | Value |
|---|---|
| Product designation | Miniature circuit breaker |
| Brand name | SENTRON |
| Parameter | Value |
|---|---|
| Number of poles | 2 |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 36 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Mounting position | any |
| Min. | -40 °C |
| Max. | 75 °C |
| Protection degree (IP) | IP20, with connected conductors |
| Parameter | Value |
|---|---|
| Pollution degree | 3 |
Breaking capacity is 4.5 kA per EN 60898 and 6 kA per IEC 60947-2, so it fits distribution boards where the prospective fault current stays under those thresholds.
Width is 36 mm — that is 2 width units (2 MW) on a standard DIN-rail enclosure, leaving room for adjacent breakers or accessories in the same row. IP20 with conductors connected; fine for dry indoor panels, not for washdown zones.
Rated breaking capacity is 4.5 kA per EN 60898 and 6 kA per IEC 60947-2 at 400 VAC. For DC circuits, the IEC 60947-2 rating is 15 kA at 72 VDC maximum.
Both are 2-pole SENTRON MCBs on the same DIN-rail quick-assembly system, so the mechanical fit is identical — same 36 mm width, same 76 mm depth. The difference is electrical: 5SY3250-7 is a 50 A C-curve; 5SY4140-7 is a 40 A C-curve. If the panel was wired for 40 A bus bars and downstream conductors, dropping in a 50 A breaker may violate coordination unless the circuit is rated for the higher current.
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price figure is published here.