Alternating Relays

Alternating relays provide significant cost savings and vastly increase equipment life by equalizing the run time of two loads in standby and lead/lag applications such as pumps, compressors, air conditioning, or refrigeration systems.

Use the AR-TL series 10A relays for a duty/standby system arrangement:

• Only one load runs at a time
• The standby device is a backup in case the first unit fails
• The alternating relay swaps the duty and standby loads to ensure even wear and prolong system life
• A three-position selector switch allows the unit to alternate the two loads as normal, or lock the relay to one load or the other

Use the ARX-TL series 10A relays for a duty/assist (lead/lag) system arrangement:

• In a traditional lead-lag pump system, the lead pump runs by itself and is designed to handle the full system load the majority of the time
• However, if the demand on the system is too great, the lag pump is also started to meet the increased demand
• The alternating relay switches the lead and lag pumps to ensure even wear and prolong system life
• A three-position selector switch allows the unit to alternate the two loads as normal, or lock the relay to always operate the same load first each time