Part Number 009-120-23 is a 120 VAC Triplex Alternator.
This Alternating Relay is a 3 input, 2 or 3 output, solid state Alternator that equalizes output load operational time. The opening of switch SW1 on pin 4 causes the Alternating Sequence Relay to change to the next sequence in preparation for the next cycle. For each cycle, the Three Pump Sequencers outputs are turned on in a 1-2-3, 2-3-1 or 3-1-2 sequence, as switches SW1-SW3 are closed. A load select switch permits the Triplex Alternator to be used as a duplex alternator until system expansion requires Triplex operation.
