The surface mount version is designed to be mounted on a flat surface behind the breaker and has lug type terminals that accept wire sizes from #14 to #2 AWG on the 15A to 100A sizes, and wire up to 250MCM on the larger breakers. Surface mount breakers can be used in the GFI Enclosure (page 108), in some older power centers, and to mount in custom combiner boxes and power centers. Use these breakers in the 175A and 250A sizes for mounting in the front spaces of the Xantrex DC Disconnect for use as inverter breakers (GJ1 Mount Kit required).