What is a Whole House Surge Protector?

M50-120T-A Residential Homes


Today's increased reliance on very sensitive electronics makes surge protection an important topic for Residential Smart Homes. The Insurance Institute for Business & Home Safety study found that $26 billion dollars was lost due to non-lightning power surges. In addition, there are about 25 million lightning strikes in the US each year that cause between $650M to $1B in losses according to the Insurance Information Institute, State Farm©.

This page discusses how to best protect your home and all the electronics within it.

Where To Install My Whole Home Surge Protector?

Per the NEC 2020, since your home is a dwelling unit as defined by Article 230.67, a UL1449 Listed SPD must be Installed at the incoming 120/240Vac main service panel. Shown below is an example using the M50-120T-A.


The M50-120T-A is installed via a 2-Pole 30A circuit breaker and will not only protect the main service panel but all smart appliances and electronics in the home like your oven, refrigerator, dishwasher, security system, televisions.

Links to SPD for your home

LocationSystemSurge Protector Model #Link
Main Service Panel120/240Vac${ITEM_LINK#2179040}<-No Item, #2179040 M50-120T-A${ITEM_LINK#2179040}<-No Item, #2179040 M50-A
Main Service Panel120/208Vac${ITEM_LINK#1505161}<-No Item, #1505161 M50-120Y-A${ITEM_LINK#1505161}<-No Item, #1505161 M50-A
Cable Broadband RouterCoaxial P8AX09-F/FF P8AX09-6G-N-FF
Ethernet SwitchCat. 6AMJ8-C6A MJ8-C6A

Contact us to develop a surge mitigation solution for your application

Where to purchase Citel SPD's