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ABB S203-K1 — 3-Pole MCB (DIN Rail)

S203-K1 Miniature Circuit Breaker, 3P, 1A, Curve K, 10kA

MPNS203-K1

ABB S203-K1 Miniature Circuit Breaker, 3 Pole, 1 Amp, Trip Curve K, 277 VAC, 10 kA Interrupting Rating, DIN Rail Mount.

$60.77Ref. price · indicative, final on quote
ABB S203-K1 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S203-K1 — Identification
ParameterValue
Number of poles3
S203-K1 — Electrical
ParameterValue
Voltage (AC)277
Current (A)1
S203-K1 — Protection
ParameterValue
Interrupting rating (AC)10 kA
S203-K1 — Mechanical
ParameterValue
Mounting typeDIN Rail
S203-K1 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

The ABB S203-K1 is a 3-pole miniature circuit breaker rated 1 A with a Trip Curve K characteristic, 277 VAC, and a 10 kA interrupting rating. Curve K typically trips between 8 and 12 times the rated current for short-circuit protection, so this 1 A breaker will hold through a motor starting surge that might nuisance-trip a Curve B or C, but still clear a hard fault fast enough to protect downstream wiring.

Deployment context

DIN-rail mount means it clips into a standard 35 mm rail inside a panel — no tools needed for the rail, just a screwdriver for the terminals. Three-pole configuration covers a 3-phase circuit, so it's the right fit for a small motor branch or a control transformer primary on a 277/480 V system.

Frequently asked questions

What is S203-K1's listed amps and trip curve?

It's rated 1 A with a Trip Curve K characteristic. The 1 A is the continuous current rating; Curve K means it's tuned for motor and inductive loads, tripping between 8x and 12x rated current for short circuits.

What is the closest functional second-source for S203-K1?

The S203-C10 is a 3-pole, 10 A, Curve C breaker with the same 277 VAC and 10 kA interrupting rating. Same DIN-rail footprint, same brand family. The key difference is the trip curve — Curve C (5-10x In) is for general-purpose distribution, not motor starting. If your circuit needs 1 A and Curve K for inductive inrush, the C10 won't match the trip characteristic. No direct drop-in second-source with identical ratings is listed.

Where can I buy S203-K1 and what is the lead time?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here.

MPN
S203-K1