The ABB S203-K63 is a 3-pole miniature circuit breaker from the S200 series, rated 63 A with a Trip Curve K characteristic. It mounts on a standard DIN rail and is rated for 480Y/277 VAC circuits, with a 6 kA interrupting capacity per UL 1077 and CSA 22.2. The K curve means the magnetic trip threshold is set between 8 and 12 times the rated current — designed for loads with moderate inrush, such as motor circuits or transformer primaries, where a standard B or C curve might nuisance-trip on startup.
S203-K63 Miniature Circuit Breaker, 63A, 3P, Curve K, DIN Ra
MPNS203-K63
ABB S200 series miniature circuit breaker, S203-K63, 63 A, 3-pole, Trip Curve K, 480Y/277 VAC, 6 kA interrupting rating, DIN rail mount, UL 1077, CSA 22.2.
$38.10Ref. price · indicative, final on quote
StockContact for availability
Lead timeCall for availability wk
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026
Specifications
Identification
| Parameter | Value |
|---|---|
| Number of poles | 3 |
Electrical
| Parameter | Value |
|---|---|
| Voltage (AC) | 277 |
| Current (A) | 63 |
Protection
| Parameter | Value |
|---|---|
| Interrupting rating (AC) | 6 kA |
Mechanical
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
Other specifications
| Parameter | Value |
|---|---|
| Type | Trip Curve K |
Product details
Frequently asked questions
What are the key ratings of the S203-K63?
The S203-K63 is a 3-pole miniature circuit breaker rated 63 A, Trip Curve K, 480Y/277 VAC, with a 6 kA interrupting rating. It mounts on DIN rail and is UL 1077 and CSA 22.2 listed.
Where can I buy the S203-K63?
The S203-K63 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
S203-K63