Signal Isolator with A/M Switch, Compatible with Manufacturer Part Number 13E632, 13E633, 13E634, 13E635, 13E636, 13E637, 13E638, 13E639, 13E640, 13E641, 13E642, 13E643, For Use With Grainger Item Number 13E632, 13E633, 13E634, 13E635, 13E636, 13E637, 13E638, 13E639, 13E640, 13E641, 13E642, 13E643, For Use With Dayton Models 13E632, 13E633, 13E634, 13E635, 13E636, 13E637, 13E638, 13E639, 13E640, 13E641, 13E642, 13E643, Mounting Type Internal, Includes A/M Switch