ABBTB S801U-K40 MCB S800 1P K 40A, single-pole miniature circuit breaker, K-curve, 40 A rating.
The K-curve means it's designed for motor and transformer loads where inrush current is higher than a resistive circuit — it tolerates short-duration surges without nuisance tripping, then clears hard faults fast.
The S800 series uses a compact 1-pole module width, so it fits tight panel layouts where every millimeter of DIN space counts. Terminal capacity handles up to 35 mm² conductor, which is generous for a 40 A breaker and simplifies daisy-chaining busbars or feeding downstream contactors.
It's a single-pole 40 A miniature circuit breaker with a K-curve, so it's used to protect motor feeders, transformer primaries, and other inductive loads that draw a higher inrush on startup than a standard B- or C-curve breaker would tolerate without tripping.
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number posted here, but the part is an active catalog line so the channel is open.