Circuit Board A/C Heat Pump Surge Protector Type: Plug-In Surge & Spike Protector

Plug-In Surge & Spike Protector - ZAPPROPlug-In Transient, Surge, Lightning, & Spike Protection for 120-240 Volt Condensing Units and Furnaces. To use, simply plug ZAP-PRO directly into contactor or circuit board, then attach ground strap (Full instructions with photos in package.)""The most common cause of Circuit Board component failure is damage as a result of poorly conditioned voltage.""This unit works with either 120V or 240V.A fast and convenient way to protect those expensive Units and Circuit Boards from 'dirty' incoming power and spikes.