Consist of length 5.875in., width 3.0in., depth 5.5in; input specifications 12ovolts, single phase, 60cps on terminals one and two, terminals three neg 24v DC and four pos 24v DC output contact rating 5amp, 29v DC to 2amp, 12ovac; operational data-normally energized and set to drop out at 114v plus or minus 2percent-111.7-116.3 and 126v plus or minus 2percent-123.5-128.5; time delay for de-energize from energize three to four seconds