BOM / RFQ

ABB S203P-K40 Miniature Circuit Breaker, 40 A, 3-Pole, K Cur

MPNS203P-K40

ABB S203P-K40 miniature circuit breaker, 3-pole, 40 A, Trip Curve K, 277 VAC, 10 kA interrupting rating, DIN rail mount.

$120.02Ref. price · indicative, final on quote

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ABB S203P-K40 datasheet (PDF)

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S203P-K40 — Identification
Parameter	Value
Number of poles	3

S203P-K40 — Electrical
Parameter	Value
Voltage (AC)	277
Current (A)	40

S203P-K40 — Protection
Parameter	Value
Interrupting rating (AC)	10 kA

S203P-K40 — Mechanical
Parameter	Value
Mounting type	DIN Rail

S203P-K40 — Other specifications
Parameter	Value
Type	Trip Curve K

Product details

Trip Curve K — what it's for

Curve K is the middle ground between B (residential/light commercial) and C (general industrial). For a 40 A frame, that magnetic pickup kicks in around 320 to 480 A — right where a motor starting surge lives.

Three-pole width means it occupies three modular spaces (about 54 mm) in the enclosure. No backplane wiring — line and load terminate directly to the screw clamps. Common in industrial control panels feeding a group of motor starters or a small distribution sub-panel.

Frequently asked questions

Where can I buy the S203P-K40 and get a price?

The S203P-K40 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What are the key ratings of the S203P-K40?

The S203P-K40 is rated 40 A, 3-pole, Trip Curve K, 277 VAC, with a 10 kA interrupting rating.

Will the S203P-K40 drop into a panel specified for the S204-C32?

No — the S204-C32 is a 4-pole breaker with a C curve, so it occupies a wider DIN footprint and has a different trip characteristic. The S203P-K40 is 3-pole with a K curve; it will not directly replace a 4-pole C-curve breaker without panel rewiring.