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ABB S201MUC-K50 — 1-Pole MCB (DIN Rail)

ABB S201MUC-K50 MCB, 1P K 50A, DIN Rail

MPNS201MUC-K50

ABB S200MUC series, 1-pole miniature circuit breaker, 50 A, Trip Curve K, 277 VAC / 250 VDC, 6 kA interrupting capacity, DIN-rail mount.

ABB S201MUC-K50 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S201MUC-K50 — Specifications
ParameterValue
Amps50
TypeTrip Curve K
Poles1
MountingDIN Rail
Volts AC277
Volts DC250
Breaking capacity6 kA
Interrupt rating DC10 kA

Product details

Curve K trips magnetically at 8 to 12 times rated current (400–600 A instantaneous), which means it rides through the inrush of a large solenoid or a 3-phase transformer secondary without nuisance tripping, but clears a hard short fast.

Panel integration — DIN-rail footprint

Single-pole width (roughly 17.5 mm) means it occupies one module position in the enclosure. The S200MUC range shares the same busbar and accessory footprint as the broader S200 series, so existing comb-busbar layouts and shunt-trip or auxiliary-contact add-ons carry over without re-wiring.

Frequently asked questions

Where can I buy S201MUC-K50 and get a price?

This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time.

What is the difference between S201MUC-K50 and S201MUC-K2?

The S201MUC-K2 is the same S200MUC series, same 1-pole DIN-rail form factor, same Curve K trip characteristic, same interrupting ratings — but rated at 2 A instead of 50 A. The S201MUC-K50 drops into the same panel footprint and busbar system as the K2; no rewiring of the DIN-rail layout is needed. The only fit change is the continuous-current rating on the branch circuit.

What does Trip Curve K mean on this breaker?

Curve K means the magnetic trip operates at 8 to 12 times the rated current — for the 50 A version, that is 400 to 600 A instantaneous. It is designed for loads with moderate inrush (motors, transformers, power supplies) where a B-curve would nuisance-trip but a D-curve might delay too long for short-circuit protection.

Will S201MUC-K50 drop into a panel specified around S201MUC-K2?

Yes — same series, same 1-pole DIN-rail footprint, same busbar and accessory compatibility. The only difference is the continuous current rating (50 A vs 2 A). No rewiring of the mounting or busbar is required.

MPN
S201MUC-K50