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How to order a suitable high voltage relay?
Date:2024.04.25 Views:104


A high voltage relay that includes any relay capable of handling high voltage applications, typically in the kilovolt range and above. These relays can bevacuum relays, but they might also begas-filledorsolid-state relays, depending on the specific application requirements.


Vacuum relays


                                Vacuum relays


Gas-filled relayscontain a gas, often an inert gas like nitrogen or sulfur hexafluoride (SF6), which helps to quench the arc when switching high voltages. These relays can handle very high voltages and currents and are often used in power transmission and distribution systems.



Avacuum relayis an electrical switch that operates inside a vacuum chamber. The vacuum prevents electric arcs from forming when the relay switches on or off, allowing it to handle high voltages more effectively and with less wear on its contacts. This also enables the relay to switch faster than relays in air. Vacuum relays are durable, compact, and operate quietly. They are typically used in applications that require rapid switching and control of high voltage circuits, such as in radio frequency transmission and power distribution systems.


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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