Description
The ALT series 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.

Features & Benefits
FEATURES BENEFITS
Debounce time delay Prevents nuisance actuating causes by waves or
spashing in the tank
Built-in manual/
auto switch
Force lead pump operation when a pump is
removed for repair or testing (on select models)