ATC Diversified ARA/ARB - Duplexor Alternating Relays

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ATC Diversified ARA/ARB - Duplexor Alternating Relays

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The ATC Diversified ARA and ARB series duplexers are used in control panel applications where two loads are required to alternate in order to provide equal run time. The alternating action is initiated by a control switch, which is common to one side of the control voltage. The output contacts will change states each time the control switch is opened, thus alternating the two loads. The LED indicators show the position of the output relay.

The ARA series is the standard duplexer, providing automatic alternating sequence. The ARB series has the automatic sequencing feature plus the option of locking into a single sequence. A three position switch permits the field selection of normal duplexing action, locking in the A-B sequence, or B-A sequence, as required. (ARB series only)


  • For the equal alternating of two loads
  • Wide range of available models
  • 3-position switch-to-lock sequence (ARB series only)
  • 8-pin plug-in enclosure

Click here for a listing of PLUG-IN SOCKETS


  • Municipal water plants
  • Wastewater treatment facilities
  • Large aquarium pumps
  • Water well installations
  • Level and pumping control systems
  • Industrial pump level monitoring

Ram Meter carries the ATC Diversified ARA/ARB - Duplexor Alternating Relays in addition to a full line of Pump & Level Controls products. For questions about the ATC Diversified ARA/ARB - Duplexor Alternating Relays and other products, or for custom and large orders call us at (800) 446-4035 or contact us online.

Additional Information

Manufacturer ATC - Diversified
Model Number ARA / ARB
Spec Sheet ATC_Diversified_ARA_Series_Specs.pdf
Relay or Controller Alternating Relay
Number of Loads 2 Loads
Supply Voltage 24 ACV, 120 ACV, 208 ACV, 240 ACV, 24 DCV, 48 DCV, 120 DCV
Relay Action Automatic Alternating, Selectable Sequencing
Additional SKUs ARA-24-ABA, ARA-24-ADA, ARA-48-DBA, ARA-48-DDA, ARA-120-ABA, ARA-120-ACA, ARA-120-ADA, ARA-240-ABA, ARA-240-ACA, ARA-240-ADA, ARB-24-ABA, ARB-24-ADA, ARB-48-DBA, ARB-48-DDA, ARB-120-ABA, ARB-120-ACA, ARB-120-ADA, ARB-240-ABA, ARB-240-ACA, ARB-240-ADA