Siemens SENTRON 5SY4363-8FA, miniature circuit breaker, 3-pole, 63 A, D characteristic, 10 kA per EN 60898, 440 V AC, 3 modular width units.
| Parameter | Value |
|---|---|
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 54 mm |
| Height | 90 mm |
| Depth | 76 mm |
The D curve holds through motor inrush (typically 10–20× rated current for a few cycles) so you don't nuisance-trip on a compressor or conveyor start.
Rated 63 A at 35 °C, it derates to 59.98 A at 40 °C and 56.83 A at 50 °C — so if your panel ambient runs 45 °C, plan for 58.4 A continuous load. The 3-pole design (3P) switches all three phases together; no neutral pole built in, so it's for a 3-wire delta or a 4-wire wye where the neutral is separately protected.
It is rated 10 kA per EN 60898, meaning it can safely interrupt fault currents up to 10,000 A at the rated voltage.
The D curve allows short-circuit trips at 10–20× rated current (630–1260 A for this 63 A breaker), so it avoids nuisance tripping on motor inrush or transformer energization. It is the standard choice for motor circuits and high-inrush loads.
The 5SY4363-8FA is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
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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