The C60H3P20AB is a 3-pole miniature circuit breaker from Schneider Electric's Multi9 C60 range, rated 20 A at 30 °C with a B curve (magnetic trip between 3 and 5 times In). The B curve means it trips fast on moderate overloads — typical for resistive or general-purpose loads where you want protection without nuisance tripping from small inrush. The 10 kA Icu at 440 V AC (30 kA at 230 V AC) tells you it can interrupt a fault up to that level without welding its contacts, which is the figure you need for SCCR coordination downstream of a transformer or main panel.
Occupies 6 modules of 9 mm pitch (54 mm width total) on the DIN rail. Tunnel-type terminals accept up to 25 mm² rigid or 16 mm² flexible conductors; strip length is 14 mm and tightening torque is 2 N.m. The toggle handle gives local ON/OFF indication, and a contact position indicator confirms isolation status — useful when verifying the circuit is dead before working downstream. Tropicalisation per IEC 60068-1 means it handles 95 % relative humidity at 55 °C without condensation issues, so it's fine for non-conditioned enclosures in humid environments.
Selectivity and coordination
The Ics (service breaking capacity) is 15 kA at 440 V AC, which is 100 % of the Icu at that voltage — meaning after clearing a fault at that level, the breaker is still usable, not destroyed. That's a practical advantage for maintenance spares planning: fewer replacements after fault events.