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ABB S204-K25 — 4-Pole MCB (DIN Rail)

ABB S204-K25 MCB 4P K 25A 277VAC DIN Rail

MPNS204-K25

ABB S204-K25 miniature circuit breaker, 4-pole, Trip Curve K, 25 A, 277 V AC, 10 kA interrupting rating, DIN rail mount.

ABB S204-K25 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S204-K25 — Specifications
ParameterValue
Amps25
TypeTrip Curve K
Poles4
MountingDIN Rail
Volts AC277
Breaking capacity10 kA

Product details

Curve K is designed for motor and inductive loads: its magnetic trip threshold (typically 8–12× In) is higher than a B or C curve, so it won't nuisance-trip on motor inrush but still protects the branch circuit against short circuits. That 25 A rating governs the maximum continuous load it can carry without thermal tripping — size your downstream conductor and load accordingly.

Where it goes in the panel

The 4-pole footprint takes four module-widths (about 72 mm) on the rail; plan your enclosure fill factor before you start wiring. Rated 277 V AC line-to-neutral, so it's at home in 480Y/277 V three-phase panels where you're protecting single-phase loads off one leg to neutral.

Frequently asked questions

Where can I buy S204-K25 and how do I get a price?

This part is sourced and quoted 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 is the closest pin-compatible alternative to S204-K25 in this component family?

Within ABB's S200 series, the S204-B25 (Curve B) and S204-C25 (Curve C) share the same 4-pole, 25 A, DIN-rail footprint. The difference is the magnetic trip threshold: Curve B trips at 3–5× In (resistive/light loads), Curve C at 5–10× In (general-purpose), and Curve K at 8–12× In (motor/inductive loads). Choose the curve that matches your load type — don't swap curves without verifying the inrush characteristic of the downstream equipment.

What is S204-K25's listed amps (25) on this component line?

The rated continuous current is 25 A. That's the maximum load the breaker can carry without thermal tripping under normal conditions.

What is S204-K25's listed type (Trip Curve K) on this component line?

The Trip Curve K characteristic means the magnetic trip threshold is 8–12 times the rated current (25 A), so it's suited for motor and transformer loads that draw high inrush without nuisance-tripping.

MPN
S204-K25