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ABB S203-K25 — 3-Pole MCB (DIN Rail)

S203-K25 Miniature Circuit Breaker, 3P, 25A, Curve K, DIN Ra

MPNS203-K25

ABB S203-K25, 3-pole miniature circuit breaker, 25 A, Trip Curve K, 277 VAC, 10 kA interrupting rating, DIN-rail mount.

$19.43Ref. price · indicative, final on quote
ABB S203-K25 datasheet (PDF)
StockContact for availability
Lead timeCall for availability wk
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026

Specifications

Identification

S203-K25 — Identification
ParameterValue
Number of poles3

Electrical

S203-K25 — Electrical
ParameterValue
Voltage (AC)277
Current (A)25

Protection

S203-K25 — Protection
ParameterValue
Interrupting rating (AC)10 kA

Mechanical

S203-K25 — Mechanical
ParameterValue
Mounting typeDIN Rail

Other specifications

S203-K25 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

What this MCB does on the panel

The ABB S203-K25 is a 3-pole miniature circuit breaker rated 25 A with a Trip Curve K characteristic, designed for DIN-rail mounting in distribution boards and control panels. The 10 kA interrupting capacity at 277 VAC means it can safely clear faults up to that level without upstream damage — sufficient for most commercial and light industrial branch circuits. Curve K (10–14x In) gives it a higher magnetic trip threshold than B or C curves, making it suited for loads with moderate inrush like motor starters or transformer primaries where you need to ride through the start-up spike without nuisance tripping.

Frequently asked questions

How do I get current pricing and availability for S203-K25?

Submit an RFQ — this part is quoted to order through independent distribution, with pricing and availability confirmed at quote time.

What is the closest pin-compatible alternative to S203-K25 in this component family?

Within the same ABB S200 series, the S203-C25 (25 A, Curve C) is the closest functional alternative — same 3-pole, 25 A, 10 kA interrupting rating, but with a lower magnetic trip threshold (5–10x In) better suited for general-purpose resistive and lighting loads rather than moderate-inrush applications.

What is S203-K25's listed amps (25) on this component line?

The S203-K25 is rated 25 A continuous current.

What is S203-K25's listed type (Trip Curve K) on this component line?

The S203-K25 uses Trip Curve K, with a magnetic trip range of 10–14 times the rated current (In).

What compliance documentation does this brand provide for S203-K25 (RoHS, REACH, UL, IEC)?

ABB typically provides RoHS, REACH, and CE declarations for the S200 series; UL and IEC 60898-1 certifications apply to this class. Specific documentation is available upon request with the RFQ.

MPN
S203-K25