This mounting bracket is used on 8903L or 8903LX lighting contactors mounted in NEMA 1 slip on cover enclosure. It is used when you need to mount a selector switch or push button into the cover of the enclosure. 8903L or 8903LX lighting contactors use this mounting bracket to mount control units in NEMA 1 slip on cover enclosure. It is used when you need to mount a selector switch or push button into the cover of the enclosure.