3 pc thermally monitored varistors

SMA Thermally Monitored Varistors – Part Number MSWR-TV9

The MSWR-TV9 is a genuine SMA spare part consisting of a set of 3 thermally monitored varistors. These components are intended for the maintenance and repair of SMA inverters as part of technical servicing operations on photovoltaic systems.

Role of Thermally Monitored Varistors

Varistors (Voltage Dependent Resistors) are electronic components whose resistance changes according to the applied voltage. They play a key role in protecting electronic circuits against transient overvoltages, such as those caused by lightning strikes or grid switching events.

The distinguishing feature of thermally monitored varistors is the integration of a temperature monitoring mechanism. This device detects abnormal heating of the component — which may indicate excessive stress or advanced ageing — and interrupts the circuit before any risk of thermal runaway or fire. This function enhances the overall safety of both the inverter and the installation.

Application and Compatibility

This spare part is intended for qualified technicians and installers working on SMA brand inverters. It is used in the context of preventive or corrective maintenance operations. Before any intervention, it is essential to verify the compatibility of part number MSWR-TV9 with the specific inverter model, by consulting the SMA technical documentation or contacting technical support.

• Set of 3 thermally monitored varistors
• Genuine SMA spare part
• Manufacturer reference: MSWR-TV9
• Application: SMA inverter maintenance
• Function: overvoltage protection + thermal monitoring

Ordering and Availability

Wattuneed supplies this SMA spare part to professional installers, maintenance technicians, and self-installing end users managing their own solar systems. If you have any questions regarding compatibility or the replacement procedure, our technical team is available to assist you.