Reliance Controls PowerBack Utility Power Return Alert-THP108 at The Home Depot

Reliance Controls

Model # THP108

Internet # 202216506

PowerBack Utility Power Return Alert

Reliance Controls PowerBack Utility Power Return Alert

This item has been discontinued.
The Home Depot no longer carries this specific product.

$39.99 / each


In Stock



Model # THP108

Internet # 202216506

The PowerBack is intended to be installed on a manual transfer panel or generator-ready load center. During a power outage, when the main breaker has been turned off to allow the generator to provide emergency power to the panel, the PowerBack can be activated and will emit a pulsing 105dB alarm when the power outage ends and utility power is again available. The PowerBack installs in a 1/2 trade size knockout in the panel within 20 in. of one of the utility hot legs. It includes an eight-inch current sensing antennae at the end of a 22 in. jacked lead. When wrapped around one of the hot legs to the main circuit breaker, the antennae will detect the returning utility current and activate the sonic alert.

  • Lights for "System Armed" and "Low Battery"
  • 9 Volt battery not included
  • UL Listed
  • 5 year warranty

Info & Guides

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Assembled Depth (in.)  1.25 in  Assembled Height (in.)  5 in 
Assembled Width (in.)  2.75 in  Electrical Product Type  Distribution Load Center / Breaker Accessory 
Load Center Type  Temporary Power  Manufacturer Warranty  5 years 
Product Series  Reliance Controls  Product Weight (lb.)  0.5 lb 
Returnable  90-Day 


Rated 4.3 out of 5 by 30 reviewers.
Rated 5 out of 5 by Great Value ! Easy to install and works great. I did not have room to mount on top of the power panel as suggested due to all the wires, so I mounted mine on a 3/4" PVC LB that I mounted on the side of my power panel at a knockout within easy reach. When activated by a power return it is VERY LOUD and can be heard throughout the house. So loud it almost hurts while getting to it to turn it off. I used to watch for neighbor's lights to come back on, now I know immediately when I can switch back from the generator. December 10, 2013
Rated 5 out of 5 by Works as advertised! Unit works great. Wrap around hot leg with electrical tape. This gives a tight fit. Sonalert is loud and I can hear it well at all locations. Added benefit is a magnet is on the back of the unit so you can place it on the box if the box is recessed. Good pricepoint as well. June 18, 2013
Rated 5 out of 5 by Excellent addition to use with interlock kit. Easy to install. Magnetic base allows you to attach to front panel. Wrap 8 inch antenna snug around left main power cable and hold in place with electrical tape for good connection/signal. Mine came with 9V battery. Very happy works very will. October 18, 2014
Rated 5 out of 5 by Works perfectly The utility power return alert is just what we needed. It was installed and it works perfectly. October 20, 2014
Rated 5 out of 5 by Reliable and loud as advertised Connecting device is quite simple. I used zip ties to secure the lead to one of the 2 hot wires coming in from the power company. Sound is plenty loud; I could hear from inside house furthest point to device in garage. Mounted right above power panel. Used wall plate to conceal wiring and double face tape to adhere device to wall plate for "cosmetic appearance". Wish I ordered sooner since I connect my power generator directly to power panel through double breakers. April 8, 2014
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