Emerson Network Power's TCS-HW features a two-stage design that provides superior protection for sensitive equipment and for ANSI/IEE c62.41 Location Category A applications. Utilizing bipolar Silicon Avalanche Diode (SAD) technology, the TCS-HW Series can be incorporated into larger power protection or used as point-of-application protection. Hardwired into a single 15 or 20 amp AC circuit, the TCS-HW Series places protection at, or near, the critical load. The field-tested design ensures continuous  protection in the most demanding environments with configuration available for 120 and 240 VAC, single-phase applications.