Alternating relays

Alternating control for booster units with 2 or more pumps.

Alternating control for booster units with 2 electric pumps.

Alternating command for booster units or effluent stations with 2 electric pumps + alarm.

Alternating control for booster units with 3 electric pumps.

Alternating control for booster units with 2 electric pumps. 2 command levels.

Alternating control for booster units with 2 electric pumps. 3 command  levels + alarm.