Bussmann CB187P-50 Eaton series CB187P marine rated circuit breaker, 48 Vdc, 50A, 5 kAIC, Automotive, type III, marine-rated, 5/16 in-18 TPI copper terminal

Yes. The CB187P-50 is rated 48 Vdc, which is the maximum DC working voltage, so it covers the 12V, 24V, and 32V DC systems typical of vehicle, marine, and battery-bank wiring as well as 48V. It will not protect an AC branch circuit, this is a DC-only automotive type III breaker.

The studs are 5/16 inch - 18 TPI copper terminals, so you need ring terminals with a 5/16 inch bolt hole and 5/16-18 nuts. Copper studs take a proper crimped ring lug on cable sized for the 50A load. Nothing in the way of lugs or hardware beyond the studs themselves comes as part of the breaker, so size and order your terminals with the cable.

Type III is the manually resettable class: after a trip it stays open until someone pushes the reset, unlike a type I that cycles on its own and a type II that stays tripped as long as power is applied. That makes the CB187P-50 the right choice where you want a fault to stay off until it has been investigated, and the wrong choice where you need an auto-resetting device on an unattended circuit.

A resettable breaker like the CB187P-50 does the same overcurrent job as a 50A fuse but restores service with a reset instead of a spare fuse, which is why it gets used on marine and vehicle DC panels. The trade is size and cost of the device against carrying spares. Where you need protection right at the battery terminal with very high available fault current, a high-interrupt fuse block is the better tool, since this breaker's clearing capability tops out at 5 kAIC.

Order Bussmann CB187P-50. The CB187P is the Eaton Bussmann series and the -50 suffix is the 50 amp rating; the amperage is built into the part number, so a different current rating is a different number, not an option you select.