Electronic Timed-Delay Unit - Single Key, Engraved Key Code Labeling, 24V DC, Set 1: 2 N.O. 20 Amp, Set 2: 1 N.C. 20 AmpOPERATIONInfo for ETDUThe Electronic Timed-delay Unit (ETU) isolator has two keys. One is a nonremovable key. The other key (Key1...