Series DPC Duplexing Pump Controller is used where two pumps are required to alternate to provide equal run time on each. The controlled relay alternates each time the control switch opens. Two LED indicators show the load that is energized by the SPDT output relay. The DPC‑ACS model is a standard duplexing controller providing the automatic alternating sequence. The DPC‑ACL offers the same automatic sequencing as well as A‑B or B‑A sequence lock selectable by a three‑position toggle switch. DPC Controllers have cUR and UR approvals.