ALT Alternating Relays Series - 8-pin Plug-in Alternating Relay

Series: ALT Alternating Relays
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The ALT alternating relays are used to alternate between two loads. The ALT is commonly used in duplex pumping applications to balance the runtime of both pumps.

The ALT-S is used in single high-level float applications. When the float switch opens, the alternating relay changes state, forcing the other pump to run the next time the float closes. All ALT relays have a built-in debounce feature that prevents the relay from changing state if the switch or float contact bounces momentarily.

The ALT-X has an internal cross-connected relay and is used in dual high-level float applications. These floats are commonly referred to as lead and lag floats.

The pumps alternate as in the ALT-S version but the crossconnected relay configuration allows both pumps to run simultaneously when both the lead and lag floats are closed. These relays are also available with a built-in switch (SW option) that is used to manually force one of the pumps to run every time the float switch is closed. This is helpful when a pump has been removed for repair or for test purposes. In the case of the ALT-X-SW, the switch essentially forces one pump to be the lead pump, while still allowing the second to run when both floats are closed.

Must use the OT08PC socket for UL Rating!

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Mounting MethodDimensionsWeight (lbs/g)Debounce Time Delay (s)Input Current Range (A)Input Impedance (Ohms)Maximum Input PowerOutput Load Rating (VA)StockSamplesCompare
ALT024-S20 - 26 Vac/VdcSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04100005480 VA @ 240 VacCheckOrder
ALT024-S-SW20 - 26 Vac/VdcSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04100005480 VA @ 240 VacCheckOrder
ALT115-S95 - 125 VacSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04560005480 VA @ 240 VacCheckOrder
ALT115-S-SW95 - 125 VacSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04560005480 VA @ 240 VacCheckOrder
ALT115-X95 - 125 VacCross wired DPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04560005480 VA @ 240 VacCheckOrder
ALT115-X-SW95 - 125 VacCross wired DPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.04560005480 VA @ 240 VacCheckOrder
ALT230-S195 - 250 VacSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.041000005480 VA @ 240 VacCheckOrder
ALT230-S-SW195 - 250 VacSPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.041000005480 VA @ 240 VacCheckOrder
ALT230-X195 - 250 VacCross wired DPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.041000005480 VA @ 240 VacCheckOrder
ALT230-X-SW195 - 250 VacCross wired DPDTDIN rail or surface mount (plug into OT08-PC socket)1.75 H x 2.38 W x 4.13 D in. (44.5 x 60.3 x 104.8 mm)0 Kg0.50.041000005480 VA @ 240 VacCheckOrder
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