The Schneider CR1F1854M7 is a TeSys F magnetic latching contactor, meaning it uses a pulsed coil to latch and unlatch the main contacts — no continuous coil power needed to hold it closed. It's a 4-pole, 4 NO configuration, rated for 185 A in AC-3 duty at 440 V, and carries utilisation categories AC-1, AC-3, and AC-4 so it handles resistive, motor, and plugging/inching loads.
The AC-1 rating at 275 A covers resistive loads like heaters. The coil pulls 1750 VA on latching (both AC and DC) but only 11 VA on unlatching, so the inrush is brief and the steady-state draw is negligible once latched. Rated insulation voltage is 1000 V, and the control circuit accepts 220-230 V AC 50-400 Hz or DC, with a latching and unlatching voltage tolerance of 0.85 to 1.1 Uc.
The CR1F1854M7 is a bolted-connection contactor — power circuit connections use bars, ring terminals, or a connector rated up to 150 mm². It measures 7.1 in deep, 8.2 in wide, and 6.9 in high, so it takes up a fair chunk of panel real estate. Tightening torque is 159.3 lbf·in (18 N·m) on the main connections.