It carries a rated operational current of 400 A in AC-4 duty (the category for inching and plugging of motors), with a rated operational voltage up to 1000 V AC. The magnetic latching mechanism holds the main contacts closed without continuous coil power — a 48 V AC/DC pulse latches it, a separate pulse unlatches it — which means the contactor stays in its last commanded state through a power loss, useful for fail-safe or energy-conscious applications. The 4 NO (normally open) power poles handle the main load; the front face is IP20 protected against finger contact, so it's safe in an open panel.
This contactor is sized for substantial three-phase induction motors. At 380–400 V AC, it switches a 200 kW motor; at 440 V, 250 kW; at 690 V, 280 kW. For UL/CSA installations, the horsepower ratings are 250 hp at 460–480 V and 300 hp at 575–600 V. These figures are for AC-3 duty (starting and stopping a running motor) at 50/60 Hz. The rated breaking capacity tells you what fault it can safely interrupt: 4000 A at 220–440 V, 3000 A at 660/690 V, and 1200 A at 1000 V — enough to clear a bolted fault on a large motor branch circuit. The associated fuse recommendation (400 A aM or gG up to 500 A BS88) gives the upstream protection boundary for the power circuit.
Coil control and power consumption
The latching coil draws 1600 VA during the latching pulse (AC 50–400 Hz or DC) and only 16 VA during the unlatching pulse. That's a brief, high-inrush pull-in, then zero holding power once latched — the contactor stays closed on the magnetic latch alone. The control voltage limits are 0.85 to 1.1 times the nominal 48 V UC for both latching and unlatching, so your control supply needs to stay within that band. Operating time is 40–75 ms to latch, 50–100 ms to unlatch, which is typical for a contactor this size.
Mounting, connections, and environmental limits
Mounts on a notched AM1-EC rail — a standard DIN-style rail for large contactors. The main power connections accept lugs or ring terminals up to 150 mm² (0.2 in²) or bars 30 x 5 mm, with a tightening torque of 35 N.m (309.8 lbf.in). The contactor measures 261 mm wide, 206 mm high, and 219 mm deep — a substantial footprint, so check your panel depth before committing. Maximum operating rate is 120 cycles per hour at 40 °C, and the mechanical durability is rated at 1 million cycles. Power dissipation per pole is 45 W in AC-3 and 70 W in AC-1, which adds up to 180–280 W total heat to evacuate from the enclosure.