PTMOV (Protected Thermally MOV) is Prosurge’s patented technology—a Metal Oxide Varistor with an integrated thermal protection mechanism and arc extinguish device. Its core advantages are:

  1. Superior Safety: Traditional MOVs can overheat and catch fire when subjected to continuous overvoltage or surges exceeding their rating. The PTMOV incorporates an internal thermal disconnector that swiftly and safely disconnects the MOV element from the circuit upon detecting abnormal temperature rise. Its advanced arc extinguishing technology effectively eliminates the risk of fire.

  2. High Fault Current Withstand Capability: Due to its excellent arc suppression, Prosurge SPDs based on PTMOV technology achieve a high Short-Circuit Current Rating (SCCR) of up to 200kArms. This means that even in the unlikely event of a failure, the SPD can withstand a fault current of up to 200,000 amperes without violent rupture or explosion, ensuring the safety of personnel and equipment. Most models achieve this SCCR without requiring an external fuse or circuit breaker, simplifying design and reducing system cost.