Siemens SENTRON 5SL3 series, miniature circuit breaker (MCB), 1-pole, C-curve, 3 A rated, 4.5 kA breaking capacity per EN 60898 / IEC 60947-2, 400 V AC, 18 mm width, IP20.
| Parameter | Value |
|---|---|
| Product designation | Miniature circuit breaker |
| Brand name | SENTRON |
| Number of poles | 1 |
| Application suitability | Residential buildings/infrastructure |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Rated value (EN 60898) | 4.5 kA |
| Overvoltage category | 3 |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Width | 18 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| IP protection class | IP20, with connected conductors |
| Halogen-free | Yes |
| Silicone-free | Yes |
At 400 V AC (multi-phase) or 250 V AC single-phase, it protects final circuits against overload and short circuit.
Width is 18 mm — one modular unit on a standard DIN rail. Mounting position is any, which simplifies crowded gland-plate layouts. IP20 with connected conductors — panel-internal use only, not for wet or outdoor locations.
Derate above 45 °C per the manufacturer's thermal curve.
The 5SL3103-7MB is 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 is published here.
The breaking capacity is 4.5 kA per both EN 60898 and IEC 60947-2 at 400 V AC. This is suitable for residential and infrastructure sub-distribution where the prospective short-circuit current stays under that level.
It accepts solid or stranded conductors from 0.75 mm² up to 25 mm². Screw terminals with a tightening torque of 2.5 to 3 N·m.
Both are 1-pole SENTRON 5SL3 MCBs with the same 18 mm width, same DIN-rail footprint, same terminal wire range. The difference is the current rating — 5SL3103-7MB is 3 A, 5SL3120-6MB is 20 A. If the panel was designed for a 20 A circuit, dropping in a 3 A breaker will trip on the load. The mechanical fit is identical; the electrical rating must match the circuit design.
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