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How to order a suitable high voltage relay?

Date: 2024.09.10 Views: 305

High voltage relays are switch devices that can handle high voltages, typically used in applications at the kilovolt level and above. Depending on different needs, they can be vacuum relays, gas-filled relays, or DC solid-state relays.

  • Gas-filled relays: These contain gas (such as nitrogen or sulfur hexafluoride) to help extinguish arcs when switching high voltages. They can handle very high voltages and currents and are commonly used in power transmission and distribution systems.

  • Vacuum relays: These operate in a vacuum environment, preventing arc formation and allowing better handling of high voltages with less wear. They switch quickly, are durable, and operate quietly, making them suitable for high voltage circuits requiring rapid switching, such as in radio frequency transmission and power distribution systems.

Vacuum relays

                          Vacuum relays

 

Application

SF6 Gas with
Tungsten/Molybdenum Contacts

SF6 Gas with
Copper Contacts (Special Use)

Vacuum with Tungsten/Molybdenum Contacts

Vacuum with
Copper Contacts

Load Bearing Only (DC)

Possible, but lower current due to increased contact resistance from gas

Good, but lower current due to increased contact resistance from gas

Very good, but not as capable as copper contacts

Best

Load Bearing Only (RF)

Not good, as gas affects RF carrying capacity

Not good, as gas affects RF carrying capacity

Good, but not as capable as copper contacts

Best

Making and Breaking

Good for making contact but can only break small currents

Good for making contact but can only break small currents

Best

Rarely used, only for very small currents

Making Contact Without Breaking Load

Best

Good, but not as good as harder material contacts

Good

Rarely used, only for very small currents

Long-term Non-use or Requires Low and Stable Leakage Current

Best when marked for make-only relays

Good, better than hard contacts in vacuum but with less carrying capacity

Good, but may experience surge currents at higher voltages

Rarely used, surge currents at higher voltages

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