The 10C is a Variable Transformer operate from 120 volt lines. It is rated at 2.25A for constant current loads and 3.0A for constant impedance loads. For over voltage connection the output rating for constant current load is 0.5A in the output range above line voltage but 0.7A in the range from zero to line voltage. All these ratings are for metal panel mounting. The 10C have 1/16-inch (1.6mm) high non-turn devices for keying the units to the panels.