Single Phase Electrical Alternator Duplex Control Panel, 7-15A (NEMA 1 Enclosure) Zoom

Single Phase Electrical Alternator Duplex Control Panel, 7-15A (NEMA 1 Enclosure)


Brand: Zoeller

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Type: Automatic
Width (Inches): 10"
Height (Inches): 12
Depth (Inches): 6"
Accessory For: Single Phase Pumps
Enclosure Type: NEMA-1

Description for Zoeller 10-1039

An Electrical Alternator is used on a duplex pump application where automatic electrical cycling of the pump is desired for added protection in residential or commercial applications. With one pump operating to handle normal flow, a second pump becomes operational in the event the water level continues to rise. The built in alarm system, a standard feature, can be connected to sound when the second pump becomes operational (3 float switch system) or independently (4 float switch system). All electrical systems must be installed by a qualified electrician and according to the National Electrical Code (see section 430-71 through 430-113, plus any others that apply).


  • Hand off auto toggle switch for each pump
  • Green pump run pilot light for each pump
  • Alarm test and silence switches
  • Red pilot light (NEMA 1 only) and audible alarm with 83 to 85 decibel rating for a high water condition
  • Red alarm beacon included with NEMA 4X enclosure
  • Auxiliary dry contact
  • High water alarm
  • On single phase - circuit breaker for each pump
  • Magnetic starter for each pump
  • Alternating mechanism
  • Numbered terminal strip for connecting pumps and variable level float switches
  • NEMA 1, general purpose or NEMA 4X, watertight enclosures available
  • Integral auxiliary terminal board connections (dry contact) for remote alarm devices
  • 3 or 4 variable level float switch control operation Three 20' float switches included with single phase panels
  • 2 year warranty
  • The use of off-the-shelf components provide for relatively easy field maintenance and repair
  • Float switches not included with three phase panels (see FM0526)
  • Refer to FM0712 for correct selection of Electrical Alternator

Single Phase Electrical Alternator Duplex Control Panel, 7-15A (NEMA 1 Enclosure)


by PowerReviews
ZoellerElectrical Alternator Duplex Control Panel (NEMA 1 Enclosure)

(based on 1 review)

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Takes the worry out of your sump pump.

By Dave

from Chicago

Verified Buyer

Comments about Electrical Alternator Duplex Control Panel (NEMA 1 Enclosure):

My basement could flood very quickly without a working sump pump. Battery back up pumps can't handle enough water and batteries tend to die when you need them. Two sump pumps can fit in the sump, but one tends to run whenever needed and the other sits waiting for the first to fail. The stand by pump may be unable to run after a long period of inactivity.

The duplex control alternates between the two pumps. If one fails, an alarm will sound and the other will handle the flow.

This is a well designed piece of industrial equipment. It uses relay logic which is not as flashy as some electronics, but is much more tolerant of voltage spikes that frequently accompany violent storms.

The instructions strongly recommend installation by an electrician. There is a lot of wiring to be done; it is not as simple as plug & play. Two different electrical circuits allow both pumps to run simultaneously and allow one to run if one of the circuits is off. I made a slight modification to power the electronics through a transfer relay so that the electronics will still function if either of the supply circuits is live.

I strongly recommend an automatic standby generator to power one of the circuits.

If you want to fool yourself into a feeling of security, buy a battery powered backup. If you REALLY need to keep your basement dry, get this duplex controller and an automatic generator.

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