Littelfuse Inc

Thermally Protected Varistors – TMOV® and iTMOV® Series

Littelfuse's thermally protected varistors helps facilitate SPD module compliance to UL1449

Image of Littelfuse 's Thermally Protected Varistors – TMOV® and iTMOV® SeriesLittelfuse's TMOV and iTMOV thermally protected varistors represent a development in integrated circuit protection, offering quick thermal response due to their close proximity of the integrated thermal element to the MOV body. The integrated configuration also offers lower inductance than most discrete solutions, resulting in improved clamping performance to fast overvoltage transients. The iTMOV varistor differs from the TMOV varistor by the inclusion of a third lead to indicate the MOV has been disconnected from the circuit. This lead facilitates connection to monitoring circuitry. In conjunction with appropriate enclosure design, these thermally protected varistors with integrated thermal elements help facilitate SPD module compliance to UL1449 for both cord connected and permanently connected applications.

Resources

Features

  • Designed to facilitate compliance to UL1449 3rd Edition for SPD products
  • High peak surge current rating up to 10 kA
  • Low leakage
  • -55°C to +85°C operating temperature range
  • Three-lead version available for indication - iTMOV series
Applications
  • SPD products
  • AC panel protection modules
  • AC line power supplies
  • Home appliances
  • Surge protected strip connectors
  • AC power meters
  • Relocatable AC power taps

iTMOV® - Indicating Output - 14 mm Disc - 6 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 430V 6KA DISC 14MMTMOV14RP275MVARISTOR 430V 6KA DISC 14MM4209 - ImmediateView Details
VARISTOR 680V 6KA DISC 14MMTMOV14RP420MVARISTOR 680V 6KA DISC 14MM1476 - ImmediateView Details
VARISTOR 510V 6KA DISC 14MMTMOV14RP320MVARISTOR 510V 6KA DISC 14MM1078 - ImmediateView Details
VARISTOR 470V 6KA DISC 14MMTMOV14RP300MVARISTOR 470V 6KA DISC 14MM1475 - ImmediateView Details
VARISTOR 620V 6KA DISC 14MMTMOV14RP385MVARISTOR 620V 6KA DISC 14MM3000 - ImmediateView Details

iTMOV® - Indicating Output - 20 mm Disc - 10 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 510V 10KA DISC 20MMTMOV20RP320MVARISTOR 510V 10KA DISC 20MM5550 - ImmediateView Details
VARISTOR 390V 10KA DISC 20MMTMOV20RP250MVARISTOR 390V 10KA DISC 20MM7694 - ImmediateView Details
VARISTOR 205V 10KA DISC 20MMTMOV20RP130MVARISTOR 205V 10KA DISC 20MM0View Details
VARISTOR 680V 10KA DISC 20MMTMOV20RP420MVARISTOR 680V 10KA DISC 20MM3322 - ImmediateView Details
VARISTOR 470V 10KA DISC 20MMTMOV20RP300MVARISTOR 470V 10KA DISC 20MM1382 - ImmediateView Details

TMOV® - Indicating Output - 25 mm Square - 20 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 430V 20KA SQUARE 25MMTMOV25SP275MVARISTOR 430V 20KA SQUARE 25MM3473 - ImmediateView Details
VARISTOR 510V 20KA SQUARE 25MMTMOV25SP320MVARISTOR 510V 20KA SQUARE 25MM2476 - ImmediateView Details
VARISTOR 240V 20KA SQUARE 25MMTMOV25SP150MVARISTOR 240V 20KA SQUARE 25MM1896 - ImmediateView Details
VARISTOR 390V 20KA SQUARE 25MMTMOV25SP250MVARISTOR 390V 20KA SQUARE 25MM9 - ImmediateView Details
VARISTOR 620V 20KA SQUARE 25MMTMOV25SP385MVARISTOR 620V 20KA SQUARE 25MM0View Details

iTMOV® - Indicating Output - 34 mm Square - 40 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 560V 40KA SQUARE 34MMTMOV34S351MPVARISTOR 560V 40KA SQUARE 34MM142 - ImmediateView Details
VARISTOR 510V 40KA SQUARE 34MMTMOV34S321MPVARISTOR 510V 40KA SQUARE 34MM178 - ImmediateView Details
VARISTOR 620V 40KA SQUARE 34MMTMOV34S391MPVARISTOR 620V 40KA SQUARE 34MM115 - ImmediateView Details
VARISTOR 430V 40KA SQUARE 34MMTMOV34S271MPVARISTOR 430V 40KA SQUARE 34MM515 - ImmediateView Details
VARISTOR 240V 40KA SQUARE 34MMTMOV34S151MPVARISTOR 240V 40KA SQUARE 34MM0View Details

TMOV® - 14 mm Disc - 6 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 470V 6KA DISC 14MMTMOV14RP300EVARISTOR 470V 6KA DISC 14MM32 - ImmediateView Details
VARISTOR 510V 6KA DISC 14MMTMOV14RP320EVARISTOR 510V 6KA DISC 14MM4015 - ImmediateView Details
VARISTOR 240V 6KA DISC 14MMTMOV14RP150EVARISTOR 240V 6KA DISC 14MM0View Details
VARISTOR 205V 6KA DISC 14MMTMOV14RP130EVARISTOR 205V 6KA DISC 14MM922 - ImmediateView Details
VARISTOR 680V 6KA DISC 14MMTMOV14RP420EL2T7VARISTOR 680V 6KA DISC 14MM1815 - ImmediateView Details

TMOV® - 20 mm Disc - 10 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 510V 10KA DISC 20MMTMOV20RP320EL2T7VARISTOR 510V 10KA DISC 20MM15663 - ImmediateView Details
VARISTOR 470V 10KA DISC 20MMTMOV20RP300EVARISTOR 470V 10KA DISC 20MM19878 - ImmediateView Details
VARISTOR 430V 10KA DISC 20MMTMOV20RP275EVARISTOR 430V 10KA DISC 20MM36109 - ImmediateView Details
VARISTOR 390V 10KA DISC 20MMTMOV20RP250EVARISTOR 390V 10KA DISC 20MM1497 - ImmediateView Details
VARISTOR 1.2KV 10KA DISC 20MMTMOV20RP750EVARISTOR 1.2KV 10KA DISC 20MM966 - ImmediateView Details

TMOV® - 25 mm Square - 20 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 620V 20KA SQUARE 25MMTMOV25SP385EVARISTOR 620V 20KA SQUARE 25MM68 - ImmediateView Details
VARISTOR 680V 20KA SQUARE 25MMTMOV25SP420EVARISTOR 680V 20KA SQUARE 25MM48 - ImmediateView Details
VARISTOR 510V 20KA SQUARE 25MMTMOV25SP320EVARISTOR 510V 20KA SQUARE 25MM21 - ImmediateView Details

TMOV® - 34 mm Square - 40 kA Surge Current

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
VARISTOR 430V 40KA SQUARE 34MMTMOV34S271EPVARISTOR 430V 40KA SQUARE 34MM110 - ImmediateView Details
VARISTOR 240V 40KA SQUARE 34MMTMOV34S151EPVARISTOR 240V 40KA SQUARE 34MM85 - ImmediateView Details
VARISTOR 680V 40KA SQUARE 34MMTMOV34S421EPVARISTOR 680V 40KA SQUARE 34MM175 - ImmediateView Details
VARISTOR 1.0875KV 40KA SQU 34MMTMOV34S681EPVARISTOR 1.0875KV 40KA SQU 34MM179 - ImmediateView Details
VARISTOR 1.2KV 40KA SQUARE 34MMTMOV34S751EPVARISTOR 1.2KV 40KA SQUARE 34MM133 - ImmediateView Details
Published: 2021-10-15

Related Product Training Modules

Thermally Protected MOVs - TMOVs An introduction to basic operation, electrical characteristics, product portfolio, features and benefits, and applications for TMOVs.
Varistor UL1449 3rd Edition Safety Agency Update Covers the 1449 3rd edition standard, key factors to consider if designing to the 3rd edition, and see Litteluse components that comply with the new standard.
Metal Oxide Varistors The basic operation, electrical characteristics, and applications of Littelfuse's Metal Oxide Varistors.

Related Product Highlight

TMOV25S / 34S Thermal Varistor The Littelfuse TMOV® 25S varistor and TMOV34S varistor series are specifically designed for applications that must meet the requirements of UL1449 3rd edition.

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