Siemens SENTRON 5SY4123-7, miniature circuit breaker, 1-pole, C-curve, 3.5 A rated current, 10 kA (EN 60898) / 35 kA (IEC 60947-2) breaking capacity, 18 mm width.
| Parameter | Value |
|---|---|
| Product designation | Miniature circuit breaker |
| Brand name | SENTRON |
| Number of poles | 1 |
| Pole design | 1P |
| Application suitability | Mechanical engineering / industry |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Rated value (EN 60898) | 10 kA |
| Energy limitation class | 3 |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Fastening method | Quick assembly system |
| Combined terminal, top | Yes |
| Combined terminal, bottom | Yes |
| Width | 18 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Modular width units | 1 |
| Torque, min. | -40 °C |
| Torque, max. | 75 °C |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| IP protection class | IP20, with connected conductors |
| Pollution degree | 3 |
| Halogen-free | Yes |
| Silicone-free | Yes |
Breaking capacity is 10 kA per IEC/EN 60898-1 for domestic-type coordination, and 35 kA per IEC 60947-2 / UL1077 for industrial panel applications — the higher figure matters when the prospective fault current at the panel exceeds 10 kA, which is common in transformer-fed switchgear.
At 35 °C ambient the breaker carries its full 3.5 A; at 50 °C it derates to 3.06 A, and at 60 °C to 2.81 A.
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