SIRIUS S00 — transformer-protection breaker with 100 kA interrupting capacity
The Siemens 3RV2811-1JD10 is a SIRIUS-branded circuit breaker in size S00, designed specifically for transformer protection per UL 489 and CSA C22.2 No.5. It delivers 100 kA interrupting capacity at 400 V AC (also 240 V AC), dropping to 42 kA at 500 V and 4 kA at 690 V — meaning it can clear a hard fault on a 400 V distribution bus without cascading upstream breakers. The 2.2 kW rating at 230 V gives a quick motor-load reference for panel builders. The screw-type main terminals accept 1 to 10 mm² solid/stranded, up to 2x 10 mm², with an M4 contact screw.
Integration — DIN-rail fit and clearances
The Pozidriv size 2 screwdriver tip (5-6 mm shaft) is standard for terminal work.
