Siemens SENTRON 5SY4308-8, 3-pole miniature circuit breaker, D tripping characteristic, 10 kA interrupting capacity per EN 60898, 20 kA per IEC 60947-2, 3 modular width units.
| Parameter | Value |
|---|---|
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 54 mm |
| Height | 90 mm |
| Depth | 76 mm |
The 5SY4308-8: Rated for 3-pole operation at 400 V AC (440 V max under multi-phase or single-phase operation) and 60 V DC (72 V max), this SENTRON MCB covers the common 3-phase panel voltages across Europe and North American industrial installations.
The D curve (10–20× In) trips magnetically at a much higher multiple of rated current than a B curve (3–5× In) or C curve (5–10× In).
Yes — the D tripping characteristic and 20 kA interrupting capacity per IEC 60947-2 make it appropriate for motor branch-circuit protection in industrial panels, provided the motor full-load current and starting surge are within the breaker's thermal-magnetic curve. Verify coordination with the upstream short-circuit protective device.
Alternative models and sibling configurations in the same Siemens series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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