Key ratings and what they mean for fit
The 3RT1024-1BB44: The 10 A AC-12 rating covers resistive loads and control-circuit switching — this is the maximum continuous current the main contacts can carry in that duty. For motor loads, the contactor is rated at 7.5 kW at 400 V and 690 V (AC-3, 3-phase induction motors). The AC-4 rating at 400 V is 12.5 A, which governs inching or plugging duty where the contacts make and break under full motor current. Coil switching capacity across DC voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. These are the auxiliary contact ratings for DC circuits — useful when the contactor's own auxiliaries switch DC loads like PLC inputs or indicator lamps.
Mounting and integration
The 45 mm wide S0 frame snaps onto 35 mm DIN rail (DIN EN 50022) and can also be screw-mounted. Side-by-side mounting is permitted, so several contactors can line up without spacing gaps — useful when packing multiple motor starters into a panel. Front face carries IP20 protection; the terminal area is IP00, so live parts are exposed and the panel enclosure must provide the final protection degree. Main circuit terminals accept solid/stranded conductors: 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), max 2x (0.75–4 mm²). Auxiliary terminals accept 2x (1–2.5 mm²) and 2x (2.5–6 mm²), max 2x 10 mm². All are screw-type terminals, so a standard Pozidriv or flathead driver is all that's needed for termination.
Environmental and coordination
Operating temperature range is -25 to +60 °C. Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive due to condensation — typical for industrial control panels). For type 1 coordination (no damage to the contactor under short circuit), the required fuse is gL/gG 63 A. For type 2 coordination (the contactor remains usable after clearing the fault), the required fuse is gL/gG 25 A.