Features

Two LEDs indicate the

energized load.

Can be ordered with a

Model ALT

switch to manually

override the system.

Alternating Relay

·

Three choices of input

Engineered

voltage provide the

versatility needed to

Protection

handle global applications.

Can be ordered with a

standard SPDT relay or

with cross connected

relays.

Features:

Debounce time delay

·Alternates between

prevents nuisance tripping

two loads

caused by float switches.

·Solid-state reliability

Compact design saves

precious panel space.

·Compact size

·Debounce time delay

·SPDT or cross connected

·Optional manual/auto

mode switch

Model 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 Model 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.

The Model ALT-X has an internal cross-connected relay and is used in

applications where two high level floats are used. These floats are

commonly referred to as lead and lag floats. The lead float causes the relay

to change state each time it opens (identical to the float in the ALT-S

application). The cross-connected relay configuration allows one pump to run

anytime the lag switch is closed. This system configuration is used when

there is a chance that the tank inflow exceeds the pumping capacity of

either pump alone. When both the lead and lag floats are closed, both

pumps will run.

These relays are also available with a built-in switch that is used to

manually force one pump to run every time the float switch is closed. This

is helpful when one pump has been removed for repair or for test purposes.

All Model ALT relays have a built-in debounce feature that prevents the relay

from changing state if the switch or float contact bounces momentarily.

2880 North Plaza Drive · Rapid City, SD 57702

(800) 843-8848 · (605) 348-5580 · FAX (605) 348-5685

www.symcominc.com · email: sales@symcominc.com

6/04