Thermally Protected Varistors - TMOV34S

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The Littelfuse Industrial TMOV34S® series thermally protected varistor represents a new development in circuit protection.It consists of a 34mm square format varistor element ( MOV) with an integral thermally activated element designed to open in the event of overheating due to abnormal over-voltage, limited current conditions.

Certain TMOV34S devices are offered with a "monitor" lead which may be connected to signalling circuity to indicate if the MOV has been disconnected from the circuit.

TMOV34S Series devices offer quick thermal response due to the close proximity of the integrated thermal element to the MOV body. The integrated configuration also offers lower inductance than most discreet solutions resulting in improved clamping performance to fast over voltage transients.


• US patent for thermally protected MOV- Patent # 6636403
• Designed to facilitate compliance to UL 1449 3rd edition for TVSS production
• High peak current rating to 40 kA -55 C to +85 C operating temp agency recognition:
o UL alternative design available with narrow 3mm wide monitor (right)
o Lead alternative design available with 2 leads only (no monitor lead)
• RoHS compliant and lead-free available


• TVSS Products
• AC panel protection modules
• AC line power supplies
• AC power meters UPS (Uninterruptable Power Supply) inverters
• AC/DC power supplies
• DIN rail