The Siemens 3RA1210-0JA15-0BB4 is a SIRIUS non-fused reversing load feeder — a factory-assembled combination of a reversing contactor, a bimetal overload relay, and a circuit-breaker in one S00-size package. Rated 0.25 kW at 400 V, it switches and protects a three-phase motor in both directions, with the bimetal overload providing thermal protection against sustained overcurrent. The integrated circuit-breakers handle the short-circuit protection up to the device's breaking capacity, so you don't need separate fuses upstream for the motor branch. The 690 V rated insulation voltage means the internal clearances and creepage are designed for a 690 V system, so it can be used on 400 V or 480 V networks without derating the insulation.
The S00 footprint — 90 mm wide, 159 mm tall, 75 mm deep — fits standard distribution boards and motor control centre buckets. Allow 20 mm clearance above and at the sides, 10 mm forward, and 9 mm backward for airflow and wiring access; no clearance needed below. Wire range accepts 0.5 to 4 mm² solid or stranded, with dual terminals for looping through — 2x 0.75 to 2.5 mm² solid or 2x 18 to 14 AWG. The IP20 front protection means it's touch-safe on the front face once installed in a panel; the rear and sides rely on the enclosure for protection.