The D-curve (10–20× In instantaneous trip) means it handles high inrush loads — motor starting, transformer energization, or welding equipment — without nuisance tripping on the initial surge, while still providing short-circuit protection.
S203-D20 Miniature Circuit Breaker, 3P, 20A, Curve D, 10kA
MPNS203-D20
ABB S203-D20, 3-pole miniature circuit breaker, 20 A, trip curve D, 277 VAC, 10 kA interrupting capacity, DIN rail mount.
$22.23Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Number of poles | 3 |
| Parameter | Value |
|---|---|
| Voltage (AC) | 277 |
| Current (A) | 20 |
| Parameter | Value |
|---|---|
| Interrupting rating (AC) | 10 kA |
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
| Parameter | Value |
|---|---|
| Type | Trip Curve D |
Product details
Frequently asked questions
What is the S203-D20's interrupting rating?
The S203-D20 has a 10 kA interrupting capacity at 277 VAC. This is the maximum fault current the breaker can safely interrupt under standard conditions — verify your panel's available fault current against this figure during coordination study.
Will the S203-D20 drop into a panel specified for the S203-C10?
Yes, same 3-pole DIN-rail footprint, same voltage rating, same interrupting capacity. The only difference is the trip curve: D (10–20× In) vs C (5–10× In). If the original design called for a C-curve, swapping to a D-curve may increase the magnetic trip threshold — verify coordination with downstream loads, especially if the circuit includes sensitive electronics that rely on the C-curve's faster magnetic response.
Where can I buy the S203-D20 and get current pricing?
The S203-D20 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer.
MPN
S203-D20