0.75 kW direct starter, 24 V DC, SIL 3 / Cat 4
The Siemens 3RA7122-1CA26-0AB4 is a SIRIUS direct starter (load feeder) in size S0, rated for 0.75 kW motor power at 400 V AC-3 duty, drawing 2.7 A. Control voltage is 24 V DC. The adjustable overload release covers 1.8 to 2.5 A.
Safety-rated: SIL 3, Category 4
This direct starter carries a Safety Integrity Level SIL 3 per IEC 61508 and Category 4 per EN 954-1. That means it is suitable for safety-related applications up to the highest performance level — think emergency stop circuits, guard door monitoring, or two-hand control on a hazardous machine. The unit is designed with cascading capability, so multiple starters can be chained in a safety circuit without extra interface modules.
The maximum short-circuit breaking capacity (Icu) is 50 kA at 400 V. The unit includes built-in short-circuit protection (the contactor and overload are coordinated internally).