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 |
|---|---|
| Brand name | SENTRON |
| Number of poles | 3 |
| Pole configuration | 3P |
| Suitability for operation | Mechanical engineering / industry |
| Parameter | Value |
|---|---|
| Tripping characteristic (curve) | D |
| Breaking capacity per EN 60898 | 10 kA |
| Overvoltage category | III |
| IP protection class | IP20, with connected conductors |
| Pollution degree | 3 |
| Parameter | Value |
|---|---|
| Rated current (AC) | 63 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 |
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.
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