Add $175.00 for FREE shipping
Shop All!
Status Indicators
208V AC
Ease of Installation
Intermediate (Installs < 60 minutes)
Other Ways to Shop
In Stock
Order the Smarthome Catalog

Protect your Home or Business from Costly Electrical Surges
Leviton 51120-3 Three Phase Whole House Surge Suppressor / Surge Protector
Leviton 51120-3 Three Phase Whole House Surge Suppressor / Surge Protector
Leviton 51120-3 Three Phase Whole House Surge Suppressor / Surge Protector
Item# 4861
Price: $255.03
Free shipping on orders over $175 - See Details


  • Unlimited main breaker panel current
  • Transient surge capacity - 950 joules
  • Maximum surge current - 50,000A
  • Response time - Instantaneous

Essential Info

Provide your home with protection from high-energy transient voltage surges that can damage sensitive electronics such as computers, audio and video gear and other electronic appliances. The Leviton 51120-3 Whole Home Surge Protector and Supressor can be used individually or as part of a coordinated application strategy, to protect sensitive electronic equipment, in industrial, commercial and residential locations. This device will divert damaging voltage transients, or surges, away from electronic equipment offering protection against catastrophic failure, costly downtime and data disruptions.


What's Included

  • 1x - Leviton 3-Phase Whole-House Surge Protector
  • 1x - Owner's Manual
  • More Info

    The Leviton Branch Panel Mounted transient voltage surge suppressor (TVSS) devices have been designed to protect residential as well as small commercial establishments from high voltage transients. Standardized J-Box metal enclosure with prepunched standard size knockouts simplifies flush mounting in typical frame construction environments, and provides convenient connection means to existing branch panels. Some of the features are:

    Additional Features
  • Tested to ANSI/IEEE C62.41 standards
  • Single high-energy solid-state semiconductor surge suppression circuitry per phase
  • Real-time diagnostic visual indicator shows power and suppression status for each protected phase
  • Each phase provided with independent thermal fuse protection
  • Feature a low VPR to ensure protection of sensitive electronic devices including LCD TVs, PDAs and computers
  • Standard J-Box enclosure with pre-punched standard knock-outs can be easily surface mounted in typical frame construction
  • Internal DIN rail module provides for easy replacement (on Type 1 outdoor unit only)
  • All versions are compatible with Leviton Decora Home Controls

  • Protection for whole-house lighting control systems
    While this whole house surge suppressor is great for protecting computers, TVs and other electronics, it can also protect against damage to lighting control systems such as INSTEON, X10 or Z-Wave. Voltage spikes of several hundred or even thousands of volts generated by outside sources do occasionally occur. We know of customers that have had several X10 components fail simultaneously for no apparent reason except for one clue, home control components that happened to be plugged into a surge suppressor/surge protector power strip were still functional.

    If you are going to be using a significant number of remote control light switches in your home adding a whole house surge protector will give you a good insurance policy against costly damage to both your home control system and other delicate electrical equipment in your house.

    We recommend that whole-house surge protector units be installed by a licensed electrician.

    This latest version of the Leviton Whole-House Surge Suppressor has greatly increased surge handling capacity. This surge protector unit is an essential component when installing an extensive whole-house lighting control systems. LEDs on the panel show operation status.

    Installation Connections:
  • J1=L1
  • J2=L2
  • J4=Neutral
  • J5=Ground

  • Specifications


    Manufacturer Product No.:51120-3
    Voltage Configuration:50kA
    Surge Counter:No
    Disconnect Switch:No
    Enclosure Rating:NEMA 1
    Protection Mode:4-Mode
    AC Noise Rejection:N/A
    Standards and Certifications:UL1449 / CSA / ANSI/IEEE Cat ABC
    Warranty:5 Year Limited

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.


    9 Ratings
    5 star: 67%  (6)
    4 star: 22%  (2)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 11%  (1)
    Average Customer Rating
    (9 customer ratings)
    Share your thoughts with other customers
    sch -- tuscaloosa, AL   12/6/2013
    FWIW the Sycom unit boasted about sells for about $50 and is rated at 10KA, only 20% of the Leviton 50KA rating.
    CET -- Arizona   3/27/2012
    Don't bother with any of these Leviton Surge Protectors. 50k is no where near enough current protection, and the other improperly listed specs tell me it's not worth $5. Joules means nothing and is not an accepted SPD standard. Also, if this is Three Phase, you can't put it on your single phase house. If it's really single phase, then it's totally mislabeled. Hire a qualified electrician to install a Sycom for you. Homeowners have no business hooking up anything like this anyway.
    DAVID -- martinsburg, PA   9/3/2010
    Seems very well-made and easy to install, but time will tell about protection from surges. I purchased this because we had failures in the remote circuitry for two ceiling fans. The replacement cost for those far exceeded the cost of this surge protector.
    MICHAEL -- chalfont, PA   7/9/2010
    Shipped and received quickly and in good order. Instructions were clear and installation by me, a DIY guy, was a snap. My only question is, how do you know if there was a surge and it worked? I guess its a case of "no news is good news!
    PETER -- warwick, RI   1/31/2009
    All hooked up and ready to go. Good price and thanks for getting it to me so quickly
    ROBERT -- cross river, NY   12/2/2007
    It's a must have for your business!
    ANIBAL -- mexico, XX   9/5/2005
    Worked as expected
    RICARDO -- celaya, GUANAJUATO, XX   9/15/2004
    If you have problems of interference " NOISE ". This is an exelente option to solve this problem

    Related Items

    Customers Also Bought

    Sign-up for Exclusive Email offers 
    How to Order Track Your Package Shipping Returns Contact Us Customer Service Retail Store
    Getting Started Learning Center FAQ Dealers Customer Testimonials Affiliate Program
    About Us INSTEON Press Awards Employment Guarantees Security & Privacy
    Free Catalog Email Newsletter Forum RSS Site Map
    Have questions? Call us at 800-762-7846 (Mon-Fri 5am-7pm and Sat 6am-3pm PT) or send us a message
    Place your order by 3pm PT for same day shipping
    Copyright 1995-2014 SMARTHOME™
    Verisign Secure Site PayPal Acceptance Mark