The ABB S202-C20 is a 2-pole miniature circuit breaker rated 20 A with a Trip Curve C characteristic, designed for DIN rail mounting in distribution panels and control cabinets. Its 6 kA interrupting rating at 277 VAC covers the fault-clearing requirement for most commercial and light industrial branch circuits — the 6 kA figure is the SCCR the breaker can safely interrupt without welding its contacts or cascading failure upstream. Curve C means the magnetic trip activates at 5 to 10 times rated current (100 to 200 A), so it holds through motor inrush and transformer energization but trips fast on a hard short.
Panel integration
Snaps onto standard 35 mm DIN rail per EN 60715. The 2-pole width (2 modules at 17.5 mm each) fits a 36 mm slot in the enclosure. Terminal design accepts 0.5 to 25 mm² copper conductor; torque to 2.5 Nm for solid or stranded wire. Leave at least 10 mm of straight conductor before the terminal to avoid stress on the cage.