ALTERNATING RELAYS
Alternating Relays equalize run times to increase equipment life and provide additional capacity. The alternating action is typically initiated by a control switch such as a float switch or pressure switch. Each time the initiating switch is opened, turning off a load, the alternating relay will change state, thus alternating the multiple loads.
Control the Run Time of Redundant Loads
Alternating relays are used in redundant load applications to equalize run times. These relays can also be used to run multiple loads simultaneously when additional capacity is needed. Duplex Controllers are used for S.O.S.O. operation, with three switch input and alternation of which pump is turned on first. If you need help picking the right relay, contact us.
DUPLEX CONTROL, PLUG-IN
ARP Series Relays ensure that multiple loads get equal run time by alternating between two loads. In a typical application, an idle standby unit is available in case the first unit fails. Alternating relays prevent deterioration of the idle unit by equalizing run time
S.O.S.O. OPERATION, PLUG-IN
ARP Duplex Series Relays combines functions of alternating relays, control relays & auxiliary contacts in one unit. The device offers sequence on – simultaneous off (S.O.S.O.) Operation with three float switch inputs.
DUPLEX CONTROL, FLANGE
ARF Series Relays ensure that multiple loads get equal run time by alternating between two loads. The flange mounted enclosure is used for inner-door mounting. A back-mounted socket is included with the relay.
TRIPLEX CONTROL, PLUG-IN
ATP Series Relays control up to three loads with three switch input: LEAD, LAG and LAG2. An optional top-mounted switch allows use as a Duplex relay until system expansion requires an additional third load.
Enclosure Style
Function
Output
Control Voltage
Standard Modifications
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ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex SPDT w/ Selector Switch
Enclosure Style:
Plug-in
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$130.00
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex SPDT
Enclosure Style:
Plug-in
Standard Modifications:
None
$122.16
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired w/ Selector Switch (Control Voltage pins 5 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$133.72
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired (Control Voltage pins 3 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
None
$126.21
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired (Control Voltage pins 5 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
None
$126.21
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired w/ Selector switch; Square Socket (Control Voltage pins 3 and 7)
Enclosure Style:
12 Pin Square
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$172.88
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired; Square Socket (Control Voltage pins 3 and 7)
Enclosure Style:
12 Pin Square
Standard Modifications:
None
$165.19
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT Cross-Wired w/ Selector Switch (Control Voltage pins 3 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$133.72
ARP Duplex
Function:
Duplex
Control Voltage
24V AC/DC
Output:
Duplex DPDT w/ Selector Switch
Enclosure Style:
Plug-in
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$133.72
ARP Duplex
Function:
Duplex
Control Voltage
12V AC/DC
Output:
Duplex SPDT
Enclosure Style:
Plug-in
Standard Modifications:
None
$122.16
ARP Duplex
Function:
Duplex
Control Voltage
12V AC/DC
Output:
Duplex DPDT Cross-Wired w/ Selector Switch (Control Voltage pins 5 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
Switch to select normal alternation or lock loads 1 or 2
$133.72
ARP Duplex
Function:
Duplex
Control Voltage
12V AC/DC
Output:
Duplex DPDT Cross-Wired (Control Voltage pins 5 and 6)
Enclosure Style:
Plug-in
Standard Modifications:
None
$126.21
Frequently Asked Questions About Alternating Relays
A Macromatic ARP Series Duplex Controller combines the function of an alternating relay, control relay and auxiliary contacts in one unit to provide Sequence On – Simultaneous OFF (S.O.S.O.) functionality. For 120V applications see ARP120A8R and for 24V applications use ARP024A8R.
Macromatic relays specify the power consumed by the device as “burden” in units of VA. Look for the burden specification in the catalog page for the specific device you have. The unit of VA(volt-amps) is essentially the same as Watts(power), current draw can be calculated in Amps by taking the VA specification and dividing by the voltage control voltage you are using to power the device.
Macromatic maintains an extensive cross reference database. Follow the link here.
Our triplex alternating relays can be used to alternate between 3 different loads. They also support running multiple pumps under high demand, provide built in time delays, and switch out of sequence protection.
Alternating Relay Downloads
Knowledge Base Articles
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