Progressive Industries 50A Portable surge protector kits contain a separate receptacle tester to detect wiring faults at the pedestal and surge module to attach to the detachable power cord. Surge module ratings: 50A: 45,000A max spike / 2,030 joules. Tests the following with a single indicator: Open Ground, Open Neutral, Open Hot. Tests the following with a single indicator: Hot/Neutral Reversed, Hot/Ground Reversed. Surge module contains surge protection indicator alerting user when depleted.