ALT-100-3-SW - ALT-XXX-1-SW / ALT-XXX-3-SW Series

Find Littelfuse Altenating Relays here.
The ALT-xxx-1-SW and ALT-xxx-3-SW are used to alternate between two loads and are commonly used in duplex pump-up and pump-down applications to balance the runtime of both pumps. The ALT-xxx-1-SW alternating relays are 11-pin octal base plug-ins, available in two different single-phase voltage ranges. The ALT-100-1-SW is used for 95-120VAC applications and the ALT-200-1-SW is used for 190-240VAC applications. Both models are designed for a single float input and feature two isolated Form C relays (DPDT) outputs with two LEDs to indicate the energized loads.

The ALT-xxx-3-SW alternating relays are 8-pin octal base plug-ins, available in two different single-phase voltage ranges.

The ALT-100-3-SW is used for 95-120VAC applications and the ALT-200-3-SW is used for 190-240VAC applications. Both models are designed for three float inputs (lead, lag and stop floats). The lead and lag floats actuate latching relays that release when the stop float actuates. The units feature two LEDs to indicate the energized load(s).

The ALT relays have a built-in debounce time delay that prevents the relay from changing state if the float momentarily bounces, and they have a built-in switch to manually force a specific load (pump) to operate each time the input float closes. This is helpful when performing periodic maintenance or pump repair.

Property (Mouseover for details) Value
Input Voltage (V) 95 to 120VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz
Output Form DPDT
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC; General Purpose: 10A @ 240VAC
Debounce Time Delay (s) 5s
Termination Type Torque: 12 in-lbs; Wire: 12 - 22AWG solid or stranded
Mounting Method DIN rail or surface mount (plug-in to OT08-PC socket)
Operating Temperature -40° to 70°C (-40° to 158°F)
Humidity 10-95% non-condensing per IEC 68-2-3
Dimensions 1.75 in H x 2.38 in W x 4.13 in D (44.5 x 60.3 x 104.8 mm)
Weight (lbs/g) 0.65 lb. (10.4 oz. 294.84 g)