What this 4 A SIRIUS breaker does on your panel
The overload release is thermal (bimetal), the short-circuit trip is magnetic — a proven dual-action design that tracks motor heating and clears fast faults independently.
Mounting and wiring — no surprises
Solid conductors from 0.5 to 2.5 mm² are supported; stranded from 0.5 to 2.5 mm² as well — no special ferrules required, though they help in repeated disconnect situations. Zero clearance needed at the sides or rear — 0 mm backwards and 0 mm at the side — so you can pack breakers tight in a multi-pole group without derating for airflow blockage.
Auxiliary contact and phase-loss coverage
Built-in transverse auxiliary switch handles 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V — enough to signal a PLC input or drop out a contactor coil directly. Phase failure detection is included, so a lost phase on the line side will trip the breaker — critical for protecting motors that can single-phase to destruction. The auxiliary switch can be extended with an add-on module if you need more than one N/O + N/C set.