TMOV25S/34S Thermal Varistor

The Littelfuse varistor series for surge protection applications is now UL1449 3rd Edition recognized

Image of Littelfuse's TMOV25S/34S Thermal VaristorThe Littelfuse TMOV® 25S and TMOV34S Varistor Series are specifically designed for applications that must meet the requirements of the Limited Current, Abnormal Overvoltage test in the UL1449 (3rd edition) Surge Protection Device (SPD) standard. The TMOV 25S and TMOV 34S Series meet the surge suppressor component recognition requirements of UL1449 for both cord-connected and permanently connected SPD end products in a single integrated package. A patented, thermally-responsive element within the body of the varistor will open the device in case of overheating, due to abnormal overvoltages.

The varistors offer high surge current ratings up to 20 kA for TMOV 25S and 40 kA for TMOV 34S. The thermally protected varistors consist of a 25 or 34 mm²-format varistor element (MOV) with an integral thermally activated element. This element is designed to open in the event of overheating due to abnormal overvoltage, limited current conditions. A number of devices include a "monitor" lead that may be connected to signaling circuitry to indicate if the MOV has been disconnected from the circuit. TMOV 34S Series and TMOV 25S varistor 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 discrete solutions, which helps ensure faster clamping response to overvoltage transients.

TMOV25S/34S Thermal Varistor

ImageManufacturer Part NumberDescriptionVaristor Voltage (Min)Varistor Voltage (Typ)Available Quantity
TMOV25SP275M datasheet linkVARISTOR 430V 20KA SQUARE 28MMTMOV25SP275MVARISTOR 430V 20KA SQUARE 28MM387V430V2593 - Immediate
TMOV25SP275M product page link
TMOV25SP250M datasheet linkVARISTOR 390V 20KA SQUARE 28MMTMOV25SP250MVARISTOR 390V 20KA SQUARE 28MM351V390V476 - Immediate
TMOV25SP250M product page link
TMOV25SP150M datasheet linkVARISTOR 240V 20KA SQUARE 28MMTMOV25SP150MVARISTOR 240V 20KA SQUARE 28MM216V240V7177 - Immediate
TMOV25SP150M product page link
TMOV25SP300M datasheet linkVARISTOR 470V 20KA SQUARE 28MMTMOV25SP300MVARISTOR 470V 20KA SQUARE 28MM423V470V692 - Immediate
TMOV25SP300M product page link
TMOV25SP385M datasheet linkVARISTOR 620V 20KA SQUARE 28MMTMOV25SP385MVARISTOR 620V 20KA SQUARE 28MM558V620V430 - Immediate
TMOV25SP385M product page link
TMOV25SP130M datasheet linkVARISTOR 205V 20KA SQUARE 28MMTMOV25SP130MVARISTOR 205V 20KA SQUARE 28MM184.5V205V409 - Immediate
TMOV25SP130M product page link
TMOV25SP175M datasheet linkVARISTOR 270V 20KA SQUARE 28MMTMOV25SP175MVARISTOR 270V 20KA SQUARE 28MM243V270V685 - Immediate
TMOV25SP175M product page link
TMOV25SP140M datasheet linkVARISTOR 220V 20KA SQUARE 28MMTMOV25SP140MVARISTOR 220V 20KA SQUARE 28MM198V220V640 - Immediate
TMOV25SP140M product page link
TMOV25SP750M datasheet linkVARISTOR 1200V 20KA SQUARE 28MMTMOV25SP750MVARISTOR 1200V 20KA SQUARE 28MM1080V (1.08kV)1200V (1.2kV)650 - Immediate
TMOV25SP750M product page link
TMOV25SP115M datasheet linkVARISTOR 180V 20KA SQUARE 28MMTMOV25SP115MVARISTOR 180V 20KA SQUARE 28MM162V180V0TMOV25SP115M product page link
Published: 2012-11-16