EPCOS

ThermoFuse™ Varistors with integrated fuse

TDK's EPCOS ThermoFuse varistors offer compact overvoltage protection with an integrated fuse

Image of EPCOS NT series ThermoFuse varistor TDK extends its EPCOS ThermoFuse family of fuse-protected varistors with the compact NT series. ThermoFuse varistors are uniquely designed disk varistors connected in series with a thermally coupled fuse and, therefore, they are intrinsically safe. If the varistor overheats, the fuse trips and isolates the varistor from the grid. This safety measure prevents any potential damage on the PCB or to the components located near the varistor and greatly increases the reliability of the equipment to be protected. Both series are available in 2-leaded and 3-leaded types, with the third lead used to monitor whether the fuse has been activated.

The NT14 series (disk diameter 14 mm) is designed to absorb maximum surge currents with an 8/20 µs pulse of 6 kA at rated voltages of between 130 VRMS and 680 VRMS, while the NT20 series (disk diameter 20 mm) has a surge current capability with an 8/20 µs pulse of 10 kA at rated voltages of between 130 VRMS and 750 VRMS.

Resources

Features and Benefits
  • Compact size
  • Wide range of voltages from 130 VRMS to 750 VRMS
  • High surge current capability of up to 10 kA
  • UL 1449 listed
Applications
  • Ballasts for lighting
  • Home appliances
  • Power supplies
  • Inverters for solar installations
  • Frequency converters for drives
  • Smart meters
  • General protection of electrical wiring and installations

Circuit Protection Kit

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
CIRC PRT KIT THERMOFUSE VARISTOR495-77283-KITCIRC PRT KIT THERMOFUSE VARISTOR4 - Immediate$540.86View Details

ThermoFuse™ NT Series Varistors

ImageManufacturer Part NumberDescriptionMaximum DC VoltsVaristor Voltage (Min)Varistor Voltage (Typ)Available QuantityPriceView Details
VARISTOR 470V 6KA DISC 17MMB72214R2301K101VARISTOR 470V 6KA DISC 17MM385 V423 V470 V333 - Immediate$15.60View Details
VARISTOR 430V 6KA DISC 17MMB72214R2271K101VARISTOR 430V 6KA DISC 17MM350 V387 V430 V721 - Immediate$17.33View Details
VARISTOR 510V 6KA DISC 17MMB72214R2321K101VARISTOR 510V 6KA DISC 17MM420 V459 V510 V950 - Immediate$10.35View Details
VARISTOR 240V 6KA DISC 17MMB72214R2151K101VARISTOR 240V 6KA DISC 17MM200 V216 V240 V878 - Immediate$17.33View Details
VARISTOR 430V 10KA DISC 23MMB72220R2271K101VARISTOR 430V 10KA DISC 23MM350 V387 V430 V1372 - Immediate$12.73View Details
VARISTOR 510V 10KA DISC 23MMB72220R2321K101VARISTOR 510V 10KA DISC 23MM420 V459 V510 V550 - Immediate$12.73View Details
VARISTOR 205V 10KA DISC 23MMB72220W2131K101VARISTOR 205V 10KA DISC 23MM170 V184.5 V205 V271 - Immediate$21.18View Details
VARISTOR 430V 10KA DISC 23MMB72220W2271K101VARISTOR 430V 10KA DISC 23MM350 V387 V430 V675 - Immediate$21.18View Details
VARISTOR 510V 10KA DISC 23MMB72220W2321K101VARISTOR 510V 10KA DISC 23MM420 V459 V510 V0 - Immediate$13.30View Details
VARISTOR 470V 10KA DISC 23MMB72220R2301K101VARISTOR 470V 10KA DISC 23MM385 V423 V470 V27 - Immediate$19.71View Details
VARISTOR 205V 10KA DISC 23MMB72220R2131K101VARISTOR 205V 10KA DISC 23MM170 V184.5 V205 V740 - Immediate$20.45View Details
VARISTOR 240V 10KA DISC 23MMB72220R2151K101VARISTOR 240V 10KA DISC 23MM200 V216 V240 V394 - Immediate$20.45View Details
VARISTOR 510V 6KA DISC 17MMB72214W2321K101VARISTOR 510V 6KA DISC 17MM420 V459 V510 V600 - Immediate$17.98View Details
VARISTOR 620V 6KA DISC 17MMB72214W2381K101VARISTOR 620V 6KA DISC 17MM505 V558 V620 V852 - Immediate$17.98View Details
VARISTOR 390V 10KA DISC 23MMB72220R2251K101VARISTOR 390V 10KA DISC 23MM320 V351 V390 V333 - Immediate$20.45View Details
Published: 2018-10-16

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Publish Date: 2019-02-11