BOM / RFQ

S203-C20 Miniature Circuit Breaker, 20A, Curve C, 3-Pole, 27

MPNS203-C20

ABB S203-C20 miniature circuit breaker, 3-pole, Trip Curve C, 20 A, 277 VAC, 6 kA interrupting rating, DIN rail mount.

$22.23Ref. price · indicative, final on quote

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ABB S203-C20 datasheet (PDF)

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

Specifications

S203-C20 — Identification
Parameter	Value
Number of poles	3

S203-C20 — Electrical
Parameter	Value
Voltage (AC)	277
Current (A)	20

S203-C20 — Protection
Parameter	Value
Interrupting rating (AC)	6 kA

S203-C20 — Mechanical
Parameter	Value
Mounting type	DIN Rail

S203-C20 — Other specifications
Parameter	Value
Type	Trip Curve C

Product details

The ABB S203-C20 is a 3-pole miniature circuit breaker (MCB) rated 20 A with a Trip Curve C characteristic, designed for DIN rail mounting in distribution panels and control cabinets.

Trip Curve C means it holds up to 5–10× rated current momentarily, so it won't nuisance-trip on motor inrush or capacitive loads but still clears fast on a hard short. The 6 kA interrupting rating at 277 VAC tells you it can safely quench a fault up to 6,000 A without welding contacts or venting gas into the panel — critical for SCCR compliance on the assembly.

Frequently asked questions

What is the interrupting rating of S203-C20?

The S203-C20 has an interrupting rating of 6 kA at 277 VAC.

Where can I buy S203-C20 and how is it quoted?

The S203-C20 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Will S203-C20 drop into a panel specified for S203-C8 without rewiring?

Yes — both S203-C20 and S203-C8 share the same 3-pole DIN rail footprint, 277 VAC voltage rating, and Trip Curve C characteristic. The only difference is the continuous current rating (20 A vs 8 A), so the panel wiring and bus bar arrangement remain compatible as long as the circuit is rated for 20 A.