How to order a suitable high voltage relay?
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.
|
Application |
SF6 Gas with |
SF6 Gas with |
Vacuum with Tungsten/Molybdenum Contacts |
Vacuum with |
|
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 |
High current, high voltage, low holding power, compact size of Vacuum Contactors
Compact size, space saving, 800A to 1400A vacuum contactor, special for wind power and PV solar.
Read More
Greegoo's motor reversing solid state relays introduction
A motor reversing solid-state relay (SSR) is an electrical switching device used to control the direction of rotation of an electric motor, direction reversal, solid state technology, fast control with protection, Noiseless Operation, compact design, longer operational lifespan.
Read More
Applications and Customization Services of DC Solid State Relays
Greegoo can offer a variety type of DC solid state relays , such as low voltage drop, fast switching, high frequency, high voltage, wide range of control voltage, built-in freewheeling diode, over-current protection, potentiometer, 4-20mA, 0-10V or 0-5V control DC relay, automotive SSR, AC converter to DC SSR, DC motor reversing SSR, multi-output DC SSR, and normally closed DC SSR, etc.
Read More
What is the purpose of a vacuum contactor?
In summary, the purpose of vacuum contactors is to provide precise and reliable control over electrical power in various applications. Their ability to handle high currents, suppress arcing, and facilitate frequent switching makes them essential components in industrial, commercial, and transportation systems where efficient and controlled power distribution is critical.
Read More
