Siemens SENTRON 5SY4340-6KK11, miniature circuit breaker, 3-pole, 40 A, B characteristic, 10 kA per EN 60898, 15 kA per IEC 60947-2, for railway applications.
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Number of poles | 3 |
| Suitability for operation | Mechanical engineering / industry |
| Parameter | Value |
|---|---|
| Tripping characteristic (curve) | B |
| Breaking capacity per EN 60898 | 10 kA |
| Breaking capacity per IEC 60947-2 | 15 kA |
| Overvoltage category | III |
| IP protection class | IP20, with connected conductors |
| Energy limitation class | 3 |
| Pollution degree | 3 |
| Parameter | Value |
|---|---|
| Rated current (AC) | 40 A |
| Rated voltage (AC, multi-phase) | 440 V |
| Parameter | Value |
|---|---|
| Modular width units | 3 |
| Mounting position | any |
| Width | 54 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Terminal tightening torque, max. | 75 °C |
| Terminal tightening torque, min. | -40 °C |
| Combined terminal, top | Yes |
| Combined terminal, bottom | Yes |
| Fastening method | Quick assembly system |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| Halogen-free | Yes |
| Silicone-free | Yes |
| Influence of surrounding temperature | max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C |
At 35 °C ambient the breaker carries the full 40 A. At 40 °C it derates to 38.4 A, at 50 °C to 36.76 A, and at 60 °C to 35.04 A. That means in a crowded enclosure with multiple breakers side by side, the actual permissible load current is lower than the nameplate 40 A — size the downstream load for the ambient your panel sees, not the 35 °C figure.
The combined terminal at top and bottom accepts both busbar and conductor connections — no need to remove the busbar to land a wire.
Three-pole, 40 A, B-curve miniature circuit breaker with 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2. The higher 15 kA figure governs for industrial panel SCCR calculations.
This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and confirmed availability — stock levels and lead times vary and are confirmed at quote time.
The 5SY4340-6KK11 shares the same SENTRON 5SY family footprint — 3 modular widths (54 mm), 76 mm depth, DIN-rail snap-on. It will physically fit the same panel location, but the 5SY4304-7CV is a different rating (lower current, different curve); verify the branch-circuit protection requirements before substituting.
The breaker carries EN 60898 and IEC 60947-2 ratings, is halogen-free and silicon-free, and is designed for railway applications. Standard Siemens SENTRON declaration of conformity and material compliance (RoHS, REACH) are available on request.
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