Safe operating tolerance (typically ~260V–265V AC), the internal solid-state relay cuts power completely within milliseconds to avoid component breakdown.Spike & Surge Suppression: Features an integrated metal-oxide varistor circuit to absorb and ground high-energy voltage transients caused by lightning strikes or transformer switching.Smart Startup Delay (TimeSaveTM): When grid power drops and immediately returns, power is held back for roughly 30 seconds. This delay ensures the grid completely stabilizes before power passes to the device, preventing damage from violent "power-back" surges. If the guard has already been disconnected cleanly for a prolonged period, it uses intelligent sensing to reconnect within 10 seconds to maximize viewing time.