ABB, S200 series, miniature circuit breaker, S201-K4A, K-characteristic, DIN rail mount, 0.12 kg.
| Parameter | Value |
|---|---|
| Weight | 0.12 kgs |
The S201-K4A: The K-characteristic is the key spec here. It's designed to handle the inrush of motor loads and transformers without nuisance tripping — magnetic trip at 8–12x rated current, compared to the B-curve's 3–5x or C-curve's 5–10x. If you're protecting a pump, conveyor drive, or small transformer secondary, the K-curve is the right call. A B-curve would trip on startup; a D-curve might let a fault through before opening.
The ABB SH201T-C16 is a peer in the same S200 family but with a C-curve characteristic — magnetic trip at 5–10x rated current. If your load is motor or transformer inrush, the K-curve of the S201-K4A is the correct fit. The SH201T-C16 would be more appropriate for general-purpose resistive or mixed loads. Both share the same DIN rail footprint and terminal style, so no rewiring needed if you swap, but the trip curve difference matters for coordination.
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