Red alarm beacon provides 360° visual check of alarm condition.
Alarm horn provides audio warning of alarm condition.
Exterior alarm test/normal/silence switch allows horn and light to be tested and horn to be silenced in an alarm condition; alarm automatically resets once alarm condition is cleared.
Horn silence relay.
IEC motor contactors control pumps by switching electrical lines.
Motor protective switches provide adjustable overload, branch circuit protection and pump disconnect.
Alternating circuit board (U.S. patent 5,909,532) provides pump control and alternation.
Hand/Off/Auto (HOA) switches for manual pump control.