In the most basic terms, a relay is a remotely operated switch designed to isolate voltage and a contactor is a remotely operated switch designed to switch power. In everyday applications there is cross over and no clearly defined difference between a relay and a contactor. High Voltage Relays and Contactors have different design characteristics but both have the advantage of being sealed providing a safe and predictable switching environment.

用最基本的術語來說，高壓繼電器是一種用于遠程操作的開關，目的是用來隔離高低電壓，而高壓接觸器是一種遠程操作的開關，目的是用來切換電源。在日常應用中，兩者是互相交叉的，高壓繼電器與高壓接觸器之間沒有明確的定義區別。高壓繼電器和高壓接觸器具有不同的設計特性，但都具有密封結構設計的優點，從而提供了安全可靠和可預測的觸點通斷切換環境。

Following are some basic questions to help in selecting the right High Voltage Relay or Contactor：

遵循以下一些基本選型問題，有助于選擇合適的高壓繼電器或高壓接觸器：

What is your circuit voltage, or what do you need to isolate?

您的電路電壓是多少？或者您需要隔離什么電壓？

If it is over 1500V then you will need to look at High Voltage Relays；If it is 1500V or less then look at Contactors.

如果超過1500V，則需要選用高壓繼電器;如果是1500V或更低，則可以選用接觸器。

What form is required, SPST, SPDT, or DPDT?

需要什么觸點形式，單刀單擲、單刀雙擲或雙刀雙擲？

High Voltage Relays offer all three possibilities. Contactors are all SPST designs.

高壓繼電器一般提供所有三種可能性。接觸器一般均為單刀單刀單擲設計。

What coil voltage is required?

需要什么線圈電壓？

Manufatures offers standard coil ratings from 5Vdc to 240VAC, product dependent. Some special coil requirements can be accommodated.

廠家一般提供從 5V 直流到 240V 交流的標準線圈額定值，取決于產品。一些特殊的線圈要求是可以按要求定制。

Are there any mechanical size or mounting requirements, PCB mount, panel mount, etc?

是否有任何機械尺寸或安裝要求， PCB安裝， 面板安裝， 等等？

Is a Latching, bi-stable, contact form required?

是否需要閉鎖觸點？雙穩態觸點？

Both High Voltage Relays and Contactors offer latching versions.

一般高壓繼電器和接觸器均提供閉鎖類型產品。

Does the relay need to switch under load, open or close, while current is flowing?

繼電器是否需要在負載下切換，斷開和接通時是否有電流通過？

? If yes and your circuit voltage is under 1500V then Contactors are probably the best choice 

如果是并且您的電路電壓低于1500V，則接觸器可能是最佳選擇

? If yes and your circuit voltage is over 1500V then High Voltage Relays are the best choice 

如果是并且您的電路電壓超過1500V，則高壓繼電器是最佳選擇

? If not switching under load, most Sensata | Gigavac switching products can meet your application needs (given other requirements). 

如果在負載電流通過情況下不切換，大多數繼電器和接觸器產品可以滿足您的應用需求

Is the application circuit DC, AC, or RF?

應用電路是直流、交流還是射頻？

High Voltage Relays and Contactors can be used in DC or AC circuits. Most High Voltage Relays are suited for RF applications.

高壓繼電器和接觸器可用于直流或交流電路。大多數高壓繼電器都適用用于射頻應用。

Are there any environmental considerations like temperature extremes, shock, vibration, etc?

是否有任何環境因素像極端溫度、沖擊、振動等等？

The environmental specifications of each product can be found on the corresponding datasheet.

每種產品的環境規格要求在相應的數據表上都可以找到。