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Firstsurge is equipped with ground reference monitoring notifying you a rare safety hazard exists due to a compromised electrical system neutral to ground bond in this case an audible alarm will beep. Firstsurge pro provides 140000 Amp of surge current capacity per phase. Every Firstsurge electrical AC service protector is equipped with worry free commercial class 3-stage notification when Firstsurge wears out its audible alarm will beep protection status LEDs extinguish and red service LED flashes. When 3-stage notification activates you turn off Firstsurge dedicated breaker and you contact your electrician to arrange for installation of replacement unit. Firstsurge can be used to surge protect any load center brand when connected to a 30A or less 2 pole circuit breaker. Firstsurge is designed to surge protect standard residential split phase 120240 60 Hz system voltage. Firstsurge is constructed using our commercial grade NEMA 4X enclosure allowing for indoor or outdoor installations. Every Firstsurge electrical AC protector is UL 1449 listed as a type 2 surge protective device SPD.