The 3RV2042-4KA10: Rated for CLASS 10 trip characteristics, this breaker provides fast overload protection for standard induction motors, clearing a stalled-rotor condition before the motor insulation reaches its thermal limit. That trip class is the one most commonly specified for general-purpose motor starting applications — conveyors, pumps, fans — where the acceleration time stays under about 10 seconds.
Dimensions are 70 mm wide, 165 mm tall, 176 mm deep. The 176 mm depth is the full body depth including terminals — measure the enclosure depth before committing the panel layout. Terminal capacity on the main circuit accepts 2x (2.5 to 16 mm²) solid or stranded, with a larger single-conductor range of 10 to 70 mm². That covers most motor feeder cables up to about 95 A copper, but note the 75 A continuous rating at 480 V and 600 V — the terminals are not the limiting factor here.
Motor ratings and protection features
Ground fault detection is not included; if ground-fault protection is required, pair this breaker with a separate ground-fault relay or use a SIRIUS 3RV2 with the GF option. Horsepower ratings span the typical 230 V to 600 V motor range: 15 hp at 230 V, 30 hp at 220/230 V, 60 hp at 460/480 V, and 75 hp at 575/600 V. These are the NEMA-equivalent ratings for the breaker's thermal-magnetic trip curve — useful when replacing a NEMA-style starter with an IEC SIRIUS solution. The wide storage range means the part can sit in a spare-parts cabinet in an unheated warehouse without issue.