2 pc thermally monitored varistors

SMA MSWR-TV7 – Pack of 2 Thermally Monitored Varistors

The MSWR-TV7 reference from SMA consists of 2 varistors featuring integrated thermal monitoring. These genuine spare parts are intended for maintenance and replacement operations in compatible SMA inverters.

The Role of Varistors in a PV System

Varistors (Metal Oxide Varistors – MOV) are voltage-dependent resistors that protect sensitive electronic circuits from transient overvoltages. When a voltage spike occurs, the varistor's resistance drops sharply, diverting the excess energy away from the inverter's internal components.

The thermal monitoring feature adds an additional layer of safety. As varistors age or degrade, they can generate excessive heat. The integrated thermal sensor detects abnormal temperature rises, allowing the system or technician to identify a failing component before it causes a more serious fault, such as a fire hazard or complete inverter failure.

Genuine SMA Spare Part

As an officially referenced SMA spare part, the MSWR-TV7 pack ensures full compatibility with the relevant SMA inverter models. Using genuine components is strongly recommended to maintain device performance, preserve warranty conditions, and comply with applicable maintenance contracts.

Who Is This Product For?

• PV installers and technicians performing maintenance on SMA inverters
• Electricians specialising in solar energy systems
• Solar park operators maintaining a stock of critical spare parts

Practical Information

This pack contains 2 thermally monitored varistors. Before carrying out any work on an inverter, always follow applicable electrical safety regulations and refer to the SMA technical documentation for your specific inverter model. If you are unsure about compatibility, please contact SMA technical support or our team at Wattuneed.