Thermal Fuse & MOV (TFV, TFMOV)

Thermal Fuse Varistor (TFV) is a varistor that incorporates thermal protection. This product possesses all the features of a standard MOV while offering additional thermal safeguards. In cases where an MOV becomes degraded due to long-term operation or abnormal surges, the leakage current of the MOV continues to increase, potentially leading to overheating and even fire. The thermal fuse, consisting of a fusible alloy, within the TFV is highly responsive to abnormal temperatures and triggers an action to disconnect the circuit, thereby preventing the MOV from overheating or catching fire. Thermal Fuse Varistors (TFV) finds wide application in various fields such as power supplies, industrial equipment, and communication devices that demand high reliability and weather resistance. SETsafe | SETfuse provides Thermal Fuse Varistors (TFV) with maximum peak current ratings ranging from 5 kA to 10 kA, and maximum continuous voltage ratings from 50 VAC to 510 VAC. These TFVs are equipped with safety certifications such as UL, cUL, TUV, and CQC, and comply with the requirements of RoHS and REACH.。TFMOV is a combination of varistors (MOV) and thermal protection component. Since varistor has the characteristics of aging or degrading; TFMOV can separate the varistor from the main circuitry by opening the thermal protection component when the varistor (MOV) degrades or fails. It is often used in which requires high reliability and weather withstanding, such as photovoltaic inverters, communication equipment, and power supplies in data centers, etc.Thermally Protected Varistors - Mechanically Off Type Thermally Protected Varistors (TFMOV) are thermally protected varistors. TFMOVs have all the characteristics of a thermally protected varistor (MOV), but are also thermally protected. there are two types of deterioration of MOVs: natural deterioration due to long term operation, and deterioration due to an abnormal surge. When a surge occurs, the leakage current of the degraded MOV increases continuously, causing the surface temperature of the MOV to rise continuously and the possibility of fire. At this time, the heat of the MOV in TFMOV is conducted to the cryogenic alloy solder joint, which senses the abnormal temperature and acts (fuses), driving the spring slider to cut off the circuit, disconnecting the MOV from the main circuit and thus protecting the entire circuit, as well as the MOV itself will not continue to heat up, and the phenomenon of catching fire. Thermal protection type varistor-mechanical release type (TFMOV) is widely used in over-voltage protection of new energy equipments and communication equipments. They play a great role in the absorption of abnormal voltage and lightning surge. SETsafe | SETfuse companies Thermally Protected Varistors (TFMOV) are mainly composed of varistors (MOV), mechanical disconnectors, flame retardant cases and metal components. Nominal Discharge Current: (5 ~ 20) kA; Maximum Continuous Operating Voltage: (17 ~ 750) VAC; Maximum Continuous Operating DC Voltage: (500 ~ 1000) VDC; Safety Approvals: UL, cUL, TUV, CE; Complies with RoHS, REACH requirements.