ABB S203-D3, miniature circuit breaker, 3-pole, 3 A, Trip Curve D, 277 VAC, 10 kA interrupting rating, DIN rail mount.
| Parameter | Value |
|---|---|
| Amps | 3 |
| Type | Trip Curve D |
| Poles | 3 |
| Mounting | DIN Rail |
| Volts AC | 277 |
| Breaking capacity | 10 kA |
Trip Curve D means the breaker's magnetic trip operates at 10 to 20 times the rated current (30–60 A instantaneous for this 3 A unit). That's deliberately higher than Curve C (5–10× In) or Curve B (3–5× In). Use it where the load draws a sustained inrush — motor starting, transformer energization, or capacitive loads — that would cause a faster curve to trip on the transient rather than the fault.
The S203-D13 is the same 3-pole Curve D breaker but rated 10 A instead of 3 A. It shares the same 277 VAC rating and 10 kA interrupting capacity. It will physically fit the same DIN-rail slot, but the amp rating must match the circuit design — do not substitute without verifying the load and conductor sizing.
Physically yes — same 3-pole DIN-rail footprint, same terminal size. Electrically no — the S203-D3 is 3 A and the S203-D13 is 10 A. Replacing a 10 A breaker with a 3 A unit will cause nuisance tripping on the intended load; replacing a 3 A with a 10 A risks conductor damage. Only swap if the circuit design and wire gauge match the new rating.
Alternative models and sibling configurations in the same ABB series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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