The Siemens 3RV1021-4CA15-ZX95 is a SIRIUS motor-protective circuit breaker rated for 22 A continuous current and 11 kW at 400 V AC-3 duty, with a CLASS 10 trip characteristic that clears overloads fast enough to protect standard induction motors during start-up. It carries a 100 kA breaking capacity at 240 V AC, dropping to 50 kA at 400 V and 10 kA at 500 V — figures that tell you it handles high-fault-current panels without needing an upstream current-limiting fuse in most installations.
At 45 mm wide, 97 mm tall, and 96 mm deep, it fits a standard single-module footprint in a motor control centre or distribution panel.
Main and auxiliary circuits use screw-type terminals. The main circuit accepts 2x (0.5…1.5 mm²) solid or 2x (0.75…2.5 mm²) stranded, plus 2x (2.5…6 mm²) stranded on the larger side — covers standard motor cable sizes up to 6 mm². Auxiliary switch terminals are transverse design, taking 2x (14…10) AWG for the control wiring.