The SPD200K and SPD300K Series offers continuous protection from damaging voltage transients and electrical noise commonly found at the service entrance or distribution panel. The robust design allows for installation flexibility in the most severe exposure locations. The SPD200K and SPD300K utilizes circuitry to monitor the status of all protection modes, including neutral to ground. In addition, high isolation form C dry contacts provide remote monitoring of protection system failure, under voltage, phase and power loss. The protection integrity monitoring indicates failure for both shorted or opened protection components.