The 3RT2018-2BG42-0CC0: The AC-3 rating of 7.5 kW at 400 V governs motor switching — that is the load a standard 400 V induction motor draws under starting and running conditions. The 125 VDC coil suits control circuits common in North American and some European DC-powered PLC or relay panels. Size S00 is the smallest SIRIUS frame; it occupies roughly 45 mm of DIN-rail width, which matters when packing multiple contactors into a compact panel. The single NC auxiliary is built in; if your circuit needs more than one auxiliary contact or an NO, you add a side-mount block from the 3RT29 series.
Siemens 3RT2018-2BG42-0CC0 Contactor, AC-3 7.5kW/400V, S00
MPN3RT2018-2BG42-0CC0
Siemens SIRIUS 3RT2018-2BG42-0CC0, AC-3 contactor, 7.5 kW / 400 V, 1 NC, 125 VDC coil, 3-pole, size S00, spring-loaded terminals.
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Product details
Frequently asked questions
What is the AC-3 rating and what does it mean?
The contactor is rated for 7.5 kW at 400 V in AC-3 duty, which covers starting and stopping of squirrel-cage induction motors. That is the rating to match against your motor nameplate for switching capability.
What coil voltage does this contactor use?
The coil is rated for 125 VDC. Confirm your control circuit voltage matches this before specifying.
What terminals does it have?
Spring-loaded (cage-clamp) terminals on both power and control circuits. No screw-torque check needed after installation.
MPN
3RT2018-2BG42-0CC0