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ABB S201-K50 — 1-Pole MCB (DIN Rail)

ABB S201-K50 50A K-Curve MCB, 277V, 6kAIC, DIN Rail

MPNS201-K50

ABB S200 series, S201-K50, 1-pole K-curve miniature circuit breaker, 50 A, 277 VAC, 6 kAIC, DIN rail mount, UL 1077 supplemental protector.

$9.49Ref. price · indicative, final on quote
ABB S201-K50 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

S201-K50 — Specifications
ParameterValue
Amps50
TypeTrip Curve K
Poles1
MountingDIN Rail
Volts AC277
Breaking capacity6 kA

Product details

50 A K-curve breaker for 480Y/277 V panels

The ABB S201-K50 is a single-pole 50 A miniature circuit breaker with a K-curve trip characteristic, rated at 277 VAC and a 6 kA interrupting capacity. It's a UL 1077 supplemental protector from the S200 series, designed for 480Y/277 V systems where you need branch-circuit overcurrent protection on a single leg to neutral. That 50 A rating handles heavy individual loads like a large conveyor drive or a compressor bank.

Single-pole footprint means it takes one module width (roughly 18 mm) in the enclosure. For a 50 A breaker at 277 V, expect 14 AWG to 6 AWG wire range on the terminals — torque to the values stamped on the side.

Frequently asked questions

What is the S201-K50's interrupting rating?

The S201-K50 has a 6 kA interrupting capacity at 277 VAC. That's the maximum fault current it can safely clear under short-circuit conditions — adequate for most downstream supplemental protection applications in 480Y/277 V panels where the upstream feeder breaker provides the main fault limitation.

Where can I buy the S201-K50 and get current pricing?

The S201-K50 is available to order through independent distribution. Submit an RFQ with your quantity and target delivery — we'll confirm availability and provide current pricing at quote time.

Will the S201-K50 drop into a panel specified around the S201M-C3?

Physically yes — both are single-pole DIN-rail breakers from the S200 series with the same footprint and mounting. The functional difference is the trip curve: the S201-K50 uses a K-curve (8-12x magnetic trip for motor/inductive loads), while the S201M-C3 uses a C-curve (5-10x for general-purpose). If the original design called for a C-curve, verify the load's inrush characteristic before substituting a K-curve — the K-curve holds longer on inrush, which could mean less nuisance tripping on motor starts but may not clear a lower-level fault as fast.

MPN
S201-K50