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ABB S281-K20A — Miniature Circuit Breakers (MCB)

ABB S281-K20A Molded Case Circuit Breaker, 20A K-Characteris

MPNS281-K20A

ABB, System pro M compact, Molded Case Circuit Breaker, S281-K20A, 20 A, K characteristic.

$48.35Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

S281-K20A — Specifications
ParameterValue
Weight0.0045 kgs

Product details

K-Characteristic and Application Context

The S281-K20A: The K-curve on this 20 A breaker provides a magnetic trip threshold typically between 8 and 12 times the rated current. This places it between the B-curve (residential/light commercial) and the Z-curve (semiconductor protection) — suited for motor circuits, transformer primaries, or mixed inductive loads where a moderate inrush tolerance is needed without the full delay of a D-curve. For a panel OEM wiring a 20 A motor branch, the K-characteristic avoids nuisance tripping on starting current while still providing short-circuit protection.

Frequently asked questions

Where can I buy S281-K20A?

The S281-K20A is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the difference between S281-K20A and S204M-C16?

The S204M-C16 is a 16 A C-curve breaker in the same System pro M compact family, while the S281-K20A is a 20 A K-curve unit. The C-curve trips magnetically at 5–10× rated current, the K-curve at 8–12×. The S204M-C16 also uses a 4-pole configuration versus the single-pole S281-K20A, so it will not drop into the same panel position without bus bar changes.

MPN
S281-K20A