B-Line Eaton Quicklag Type QC Industrial Thermal-Magnetic Miniature Circuit Breaker,Industrial miniature ,40 A,10 kAIC,Four-pole,240 V,Thermal-magneti

Yes. The Quicklag Type QC model QC4040H is a four-pole industrial miniature circuit breaker rated 40 A at 240 V. Four poles means it switches three phases plus a neutral or a fourth switched leg together, so all four conductors open on a trip.

It is a cable-in/cable-out breaker, so both line and load land on terminal lugs with conductors rather than clipping onto a panel bus stab. That makes it suited to industrial enclosures, control panels and equipment builds where you are running cable straight into the device.

No. This breaker is rated 240 V only, so it cannot be applied on 480 V or 600 V equipment. For a four-pole 40 A application above 240 V you need a breaker with a higher voltage rating on its nameplate.

The Quicklag QC uses a thermal-magnetic trip: a bimetal element handles sustained overloads with an inverse time delay, and a magnetic element trips instantly on a short circuit. That combination protects both the conductors against long-duration overload and the circuit against faults. A magnetic-only (instantaneous) device gives short-circuit protection alone and relies on a separate overload relay, which is why it shows up in motor starter combinations rather than general branch and feeder work.

Order Eaton Quicklag catalog number QC4040H. The number breaks down as Type QC, four-pole, 40 A, with the H suffix denoting the 10 kAIC interrupting rating at 240 V. If the unit you are replacing carries a different suffix, the interrupting rating differs and you should match the existing designation.

The catalog spec gives 12 in length/depth, 5 in height and .6 in width, with a product weight of 7.31 lb. Use those figures when you are checking gutter space and mounting room in the enclosure before you order.