Leviton 120/240 Volt Panel Protector, 4-Mode Protection, Light Commercial/Residential Grade, In NEMA 1 Enclosure, 51120-1

Easy to install but requires a large hole in the wall next to your fuse box if your wall is finished. The box is also deep so there can be no other wiring behind it. I put a inch of blocking behind the box in my situation so that the knock out would align with a knock out in my fuse box and I could connect them together with a straight piece of conduit.

This surge suppressor works for the whole house and is straight forward for a licensed electrician to install. Looks nice embedded into the wall next to the electrical panel too!

Good quality

great product

Although I am a graduate electrical engineer and formerly a licensed electrician, installing this Leviton 51120-1 120/240 Volt Panel Protector and connecting it to my modern Leviton electric panel was no small project. Without such a background, a do-it-yourself homeowner might be prudent to hire an electrician.To gain access to one of my main panel's knock-outs, so I could install a 1/2" X 3 1/2" conduit nipple between the two, I used a hole saw to create an opening through a wooden stud. That required a right angle drill because a conventional drill would not fit into the 6" square opening required for the Panel Protector.The knock out on the electric panel, of course, needed to be exactly aligned with the knockout on the panel protector. Careful measurements are important. Installing the conduit nipple between the two metal cabinets, required lock nuts and bushings on each end before threading the wire. Using metal conduit between my panel and this device helps to enhance ground continuity in addition to the green grounding wire. The extra grounding should improve protection.Instructions with this surge protection unit suggests connecting it to the panel through a two-pole 20-amp or 30-amp circuit breaker. My choice was a 30-amp breaker which calls for #10 copper wire. I used THNN wire for the connections, which included L1 & L2 hot wires, a white neutral and a green grounding wire.A DEWALT Impact ready right angle attachment to my impact tool enabled me to use screws to mount and secure the panel protector to the wooden stud. Turning on the breaker illuminated the two green lights on this device showing that it is actively protecting. I'm optimistic that this surge protection will be effective for our home, which has had some power surge issues in the past.The photo shows my modern Leviton panel with the Leviton surge protection unit to the right.

Easy to for electrician to install, good value. With the large number of circuit boards in our homes today it only makes sense to protect the whole house wiring. Recommended

I use this to protect the electronic devices in my home.

#1: HEED THE WARNING STICKER and do NOT try to take the cover off while your breakers to the unit are live, unless you like a loud bang and a flash! My unit that I replaced with this did not have the sticker on it. The terminals on the bottom of this are bare and VERY close to the edge of the box and WILL contact it and arc if you do not cut power. I cannot attest to how well these work other than the fact that while we have been in this home we have not had any equipment damaged by surges that I'm aware of. We have 2 of these installed. It would be nice if Leviton insulated the terminals on the top and bottom better to prevent shorting, but you really shouldn't be messing with these without cutting the power so...*shrug* I can't fault them for that really. Installation/replacement is straight forward and basically just consists of 2 20A breakers being hooked up to it and your grounding. Can't get a lot simpler than that.

For the $300 dollars I believe every house should have one. Install was straight forward and it is very well made.

Great outside of the panel mounted surge protector.

Easy to install.

Very nice surge protector, hope it works if ever needed.