NEMA 12 - Control Panel (for Duplex & Simplex Pumps)
For Simplex units, the control panel would include a single motor starter with a single
HOA (HAND-OFF-AUTOMATIC) selector switch to turn the pump on manually to verify
functionality; or, to set in automatic mode along with a single Motor Circuit Protector
switch to shut power off to the pump.
For Duplex systems, the control panel would include two motor starters with two
HOA (HAND-OFF-AUTOMATIC) selector switches to turn either of the two pumps on
manually to verify functionality, or to set in automatic mode along with two separate
Motor Circuit Protector switches to shut power off to either of the two pumps.