ARP Series Duplex


Lead Time: In Stock

$129.69 (USD) / EACH

Description Of Function

In the off state, both the LEAD Switch and the LAG Switch are open, the Alternating Relay is in the LOAD 1 position, and both LOAD 1 & LOAD 2 are off. The red LED marked "LOAD 1" is ON. When the LEAD Switch closes, it energizes LOAD 1. As long as the LEAD Switch remains closed, LOAD 1 remains energized. If the LAG Switch closes, it energizes LOAD 2. When the LAG Switch opens, LOAD 2 is turned off. When the LEAD Switch opens, LOAD 1 is turned off and the Alternating Relay toggles to the LOAD 2 position. The red LED marked "LOAD 2" is ON. When the LEAD Switch closes, it turns on LOAD 2. If the LAG Switch closes, it will energize LOAD 1. When the LAG Switch opens, LOAD 1 is turned off. When the LEAD Switch opens, LOAD 2 is turned off, the Alternating Relay toggles back to the LOAD 1 position, the red LED marked "LOAD 1" is ON, and the process can be repeated. NOTE: the LEAD switch must always close before the LAG switch and must always open after the LAG switch.

Function Chart

function chart

Product Overview

  • For Duplex Control of two loads
  • Optional low profile selector switch to lock in one sequence
  • 2 LEDs indicate relay status
Enclosure Style

Plug-in case utilizing industry-standard octal sockets

Configuration / Contact Rating
  • 10A @ 240V AC/24V DC, 1/2HP @ 120/240V AC (N.O.), 1/3HP @ 120/240V AC (N.C.)
Application Information
  • Voltage Tolerance: AC Operation: +10/-15% of nominal at 50/60 Hz.; DC Operation (12 & 24V only): +10/-15% of nominal.
  • Load (Burden): Less than 3 VA
  • Indicator LEDs: Two LEDs marked LOAD 1 and LOAD 2
  • Life: Mechanical: 10,000,000 operations; Full Load: 100,000 operations
  • Temperature: -28° to 65° C (-18° to 149° F)


Duplex Alternating Relays are used in special applications where the optimization of load usage is required by equalizing the run time of two loads. This alternating action is initiated by a control switch, such as a float switch, manual switch&, timing relay, pressure switch, or other isolated contact. Each time the initiating switch is opened, the output relay contacts will change state, thus alternating the two loads. Two LED indicators show the status of the output relay.

Cross-wired alternating relays are also used where additional capacity is required in case of excess load requirements. Not only will this version alternate between two loads, but it also allows both loads to run simultaneously when the lead and lag switches are closed, thus providing a way for both loads to operate when running just one does not provide enough capacity.

Duplex Alternating Relays are available in three output configurations: SPDT, DPDT and DPDT cross-wired. See Knowledge Base Article for more information.

Each version is available with an optional three position selector switch. This allows the unit to alternate the two loads as normal, or lock the relay to one load or the other. By locking the Alternating Relay to one load, the other load can be removed for service without rewiring the first load for continuous operation. In addition, on cross-wired versions, locking a load to always operate first allows the user to balance the run time of both loads if one load has fewer hours of operation than the other. The selector switch has a low profile to prevent any accidental changes in status.

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  • Function Configuration: Single Channel 11 Pin DPDT
  • Control Voltage: 120V AC
  • Output: 7A DPDT
  • Sensitivity Range: 1K to 250K ohms
  • Mount: Plug-in
  • Communication Platform: None
  • Monitored Voltage: 102-138V AC
  • Output: 10A SPDT
  • Protection: Phase Loss, Phase Reversal, Voltage Unbalance, Undervoltage & Overvoltage
  • Standard Modifications: None
  • Enclosure Style: Plug-in
  • Control Voltage: 120V AC
  • Output: 4 Form C Contacts
  • Options: Standard (LED and Push-to-Test Included)
  • Terminal Configuration: Blade