Key Ratings & What They Mean
The 3RT1024-3BM40: This is a SIRIUS power contactor in the S0 frame size, designed for switching motor loads in control panels. The 220 V AC coil is the control voltage — match it to your control transformer or PLC output card. For motor duty, the AC-4 rating at 400 V is 12.5 A — that's the switching current for reversing or inching applications where the contactor makes and breaks the motor at full load. The AC-2 rating at 400 V is 5.5 kW, covering slip-ring motor starting. At 500 V and 690 V, the motor power rating is 7.5 kW, so this contactor handles a standard 7.5 kW induction motor on a 500 V or 690 V line. The auxiliary contact block is rated for switching at various control voltages: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. That covers pilot duty for PLC inputs, relay coils, and indicator lamps. Mechanical life is rated at 10,000,000 operations typical, so this contactor is suited for high-cycle applications like conveyor systems or packaging lines.
Mounting & Integration
Mounts via screw or snap-on onto a 35 mm DIN rail per EN 50022. The S0 frame is 45 mm wide, 85 mm tall, and 100 mm deep — fits standard panel layouts. Side-by-side mounting is permitted with no derating, which saves rail space in dense cabinets. The front of the contactor is IP20, meaning finger-safe for panel installation. The terminal area is IP00, so live parts are exposed — maintain safe clearance inside the enclosure. Main circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid/stranded, 2x (2.5 to 6 mm²), or up to 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), or 1x 8. Solid wire range is 2x (0.25 to 2.5 mm²).
Coordination & Environment
For Type 2 coordination (no damage to the contactor on a short circuit), use a gL/gG fuse rated 25 A. For Type 1 coordination (contactor may need replacement after a fault), the fuse rating is 63 A. This matters for selectivity studies and SCCR compliance. Operating temperature range is -25 to +60 °C, suitable for most industrial environments. Pollution degree 3 means it's rated for conductive pollution environments typical of control panels. Maximum operating altitude is 2,000 m. Coil consumption: 5.4 W closing power and 5.4 W holding power (DC). The holding power is the same as closing, so the coil driver sees a constant load — no power-save circuit inside this variant.