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.

用最基本的术语来说，高压继电器是一种用于远程操作的开关，目的是用来隔离高低电压，而高压接触器是一种远程操作的开关，目的是用来切换电源。在日常应用中，两者是互相交叉的，高压继电器与高压接触器之间没有明确的定义区别。高压继电器和高压接触器具有不同的设计特性，但都具有密封结构设计的优点，从而提供了安全可靠和可预测的触点通断切换环境。

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

遵循以下一些基本选型问题，有助于选择合适的高压继电器或高压接触器：

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

您的电路电压是多少？或者您需要隔离什么电压？

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.

如果超过1500V，则需要选用高压继电器;如果是1500V或更低，则可以选用接触器。

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

需要什么触点形式，单刀单掷、单刀双掷或双刀双掷？

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

高压继电器一般提供所有三种可能性。接触器一般均为单刀单刀单掷设计。

What coil voltage is required?

需要什么线圈电压？

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

厂家一般提供从 5V 直流到 240V 交流的标准线圈额定值，取决于产品。一些特殊的线圈要求是可以按要求定制。

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

是否有任何机械尺寸或安装要求， PCB安装， 面板安装， 等等？

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

是否需要闭锁触点？双稳态触点？

Both High Voltage Relays and Contactors offer latching versions.

一般高压继电器和接触器均提供闭锁类型产品。

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

继电器是否需要在负载下切换，断开和接通时是否有电流通过？

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

如果是并且您的电路电压低于1500V，则接触器可能是最佳选择

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

如果是并且您的电路电压超过1500V，则高压继电器是最佳选择

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

如果在负载电流通过情况下不切换，大多数继电器和接触器产品可以满足您的应用需求

Is the application circuit DC, AC, or RF?

应用电路是直流、交流还是射频？

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

高压继电器和接触器可用于直流或交流电路。大多数高压继电器都适用用于射频应用。

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

是否有任何环境因素像极端温度、冲击、振动等等？

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

每种产品的环境规格要求在相应的数据表上都可以找到。