Varistors & Surge Suppressors

HVP can provide MOVs for high power and high voltage AC & DC applications, these devices will extended the lifetime of the critical components.

  • A Varistor (or voltage-dependant resistor) is a component that varies its electrical resistance as the applied voltage changes. At low voltage they have a high electrical resistance and at high voltage a low electrical resistance. In a system they are ideal for diverting surge voltages and spikes away from critical components.
  • Metal Oxide Varistors (MOVs) are made from zinc oxide and other metal oxides placed between two metal plates or contacts. The functions and applications of these components are similar to standard varistors.

Surge Suppressor Assemblies

  • Capable of handling long pulses, 100-400 msec
  • Fast response time 5-10 nanoseconds
  • High body temp. operation, continuous 110°C
  • Large mass device and consequently high energy

Bare MOV Discs

  • High surge rating on short pulses
  • Fast response time pico-second range
  • Low standby (leakage) current
  • Board mountable, (Larger devices available)


Lightning Surge Arrestor

  • MOV Based
  • Distribution rated to 42kV
  • Intermediate rated to 138kV
  • Polymer Design


Thermally Protected - Module MOVs

  • Quick thermal response and perfect circuit cut-off
  • High surge current capability
  • UL 1443 approved

Selenium Surge Suppressor

  • DC type polarized, non-polarized version available
  • High energy, self-healing characteristics


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Metal Oxide Varistors

Max. Continuous Operating VoltageVaristor VoltageEnergy RatingMax. CurrentMax. Clamping
Surface Mount MOVs8 - 300Vac (11 - 385Vdc)15 - 470 V0.4 - 25J0.2 - 1.2 kA28 - 775 V
Radial Lead MOVs11 - 1000Vac (14 - 1465Vdc)18 - 1800 V0.6 - 725J0.1 - 20 kA40 - 2970 V
Encapsulated MOVs130 - 660Vac (175 - 850Vdc)200 - 1050 V370 - 1250J40 kA320 - 1740 V
Tab Lead MOVs130 - 1000Vac (170 - 1350Vdc)205 - 4230 V100 - 3500J10 - 70 kA325 - 2800 V
Bare MOV Discs130 - 1400Vac (170 - 1750Vdc)200 - 2200 V310 - 7000J10 - 70 kA340 - 3580 V
Case MOVs130 - 2800Vac (170 - 3500Vdc)205 - 4700 V210 - 7000J25 - 100 kA340 - 7400 V

Silicon Carbide Varistors

Max. Continuous Operating VoltageMax. Continuous Power RatingMax. Discharge CapacityVaristor Voltage Max.
Bare Disc Surge Suppressors150 - 300 VAC (135 - 270 VDC)1.5 - 10 W275 - 22500 J210 - 660 V
Surge Suppressor Assemblies6 - 600 VDC3 - 240 W1.1 - 540 kJ

Surge Arrestors

Rated VoltageMax Voltage at 1mACurrent Impulse Withstand CapacityMax. Residual Voltage Ratio
Bare Disc Surge Arrestors0.28 - 6 V0.6 - 8.4 V40 - 100 kA1.69 - 1.88 kV
Lightning Surge Arrestor3 - 36 kV4.3 - 51.6 V65 - 100 kA8.8 - 122.4 kV

Thermally Protected Suppressors

Maximum Continuous VoltageSurge CurrentResponse Time
DIN Rail Class II Surge Arrestor150 - 690 VAC (200 - 910 VDC)20 - 50 kA25 nS
Module MOVs150 - 690 VAC (200 - 910 VDC)22 - 50 kA25 nS
Power Line SPDs - 25 - 300 kA -
Radial Lead MOVs50 - 680 VAC (65 - 895 VDC)10 - 15 kA25 nS

Selenium Surge Suppressors

Maximum DC VoltageMaximum Clamping VoltagePeak Discharge Current
SD Series90 - 675 VDC240 - 1800 V3 - 904 A