The Model 441 Multi-Stage Alternator is designed to control the operating sequence of multi-stage motor/pumping systems. It can also be used to maintain the desired level of pressure-on air compressor systems. Four motor select DIP switches located on the front panel allow the alternator to control a single-motor/pump, two-motor/pump, three-motor/pump or four-motor/pump system.

The Model 441 will assure that only the necessary motors/pumps are operating, and that the run time for each motor/pump is approximately equal. Motors are sequenced “first-on, first-off”. If the motor/pumping demand requires only one motor/pump at a time, the alternator will start the next motor/pump in sequence each time an input switch is closed. Input switches may be float switches, pressure switches, flow switches, etc., as required by the application.

Potential uses for the Model 441 include water supply systems, sewage disposal plant systems, storage tank filling systems, air compressor systems, irrigation and water recycling systems.




Input Voltage 

120VAC ±10%
50/60 Hz

240VAC ±10%
50/60 Hz

Power Consumption

6.0 watts max.

Transient Protection

2500 VRMS for 10 msec

Delay Between
Relay Operations

5 seconds

Output Contact Rating

SPST  5A at 250VAC or 5A at 30VDC

Input Contact Requirement

 0.001 amp at 12VDC

Expected Relay Life  Mech:  10 million operations
   Elec:    100,000 at rated load
Operating Temp

- 40° to +140° F

Humidity Tolerance

 0-97% w/o condensation

Enclosure Material

 ABS Plastic


1.0 lbs.


Motor/Pump Select Switch 
OFF (open) Motor/Pump disabled
(unit will not try to use that motor) 
ON (closed) Motor/Pump enabled
(unit will operate relay for motor as needed) 

The Model 441 is not a personal safety device.  Remove power from Motors/Pumps before servicing.