ABB S203-D3, miniature circuit breaker, 3-pole, 3 A, Trip Curve D, 277 VAC, 10 kA interrupting rating, DIN rail mount.
| Parameter | Value |
|---|---|
| Number of poles | 3 |
| Parameter | Value |
|---|---|
| Voltage (AC) | 277 |
| Current (A) | 3 |
| Parameter | Value |
|---|---|
| Interrupting rating (AC) | 10 kA |
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
| Parameter | Value |
|---|---|
| Type | Trip Curve D |
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.