The Schneider Electric CR1F1854EZ7 is a magnetic latching contactor from the TeSys F range, built for control applications switching resistive and motor loads. It carries 4 normally-open power poles and is rated for utilisation categories AC-1, AC-3, and AC-4, so it handles resistive heating loads, standard squirrel-cage motor starting, and plugging/inching duty on the same set of contacts. The headline rating is 185 A at 440 V AC in AC-3 duty, which means it will switch a motor drawing that current through its full starting cycle without welding the contacts. For resistive loads (AC-1) the conventional free-air thermal current Ith is 275 A at 104 °F (40 °C), giving headroom for heater banks or lighting panels. The 48 V DC low-consumption coil draws 500 W to latch and 20 W to unlatch, with operating times of 35 to 40 ms latching and 50 to 100 ms unlatching.
This is a panel-mount contactor sized for a 600 V class motor control center or standalone enclosure. The 4-pole block measures 7.1 in deep, 8.2 in wide, and 6.9 in tall, with bar-type terminals accepting two 25 x 3 mm bars or lugs up to 150 mm². Tightening torque is 159.3 lbf·in (18 N·m) on the power connections.
Rated insulation voltage is 1000 V per IEC 60947-4 and BS 775, with an impulse withstand of 8 kV. Short-time withstand current Icw holds 1500 A for 1 second at 104 °F (40 °C), which gives selectivity headroom for upstream fuse coordination — the associated fuse rating is 200 A aM or 315 A gG at 440 V. Breaking capacity is 1800 A at 440 V, making capacity is 2100 A.