SA20

SA20 is a surge appliance rated at 600-W peak pulse power (10/1000 µs). It is designed for applications providing protection against transients and surges, and is typically used for telecommunications or industrial applications. The SA20 is capable of withstanding up to 15-kV surges (line-to-ground) and has fast response time (less than 10 ns).

The SA20 is a unidirectional Thyristor Surge Protector (TSP). It is composed of two back-to-back high voltage silicon-controlled rectifiers (SCR). When a surge voltage is applied, the SCRs will activate and limit the surge current. This will in turn limit the voltage on the protected equipment or device. A fast response time ensures that the SCRs will response instantly and prevent any large voltage spikes on the protected device.

The SA20 has several benefits when compared to other surge suppressors. It can be used in both indoor and outdoor environments, and is capable of withstanding temperatures from -40◦C to 85◦C. Another advantage is that it does not require additional surge protection components, such as capacitors or inductors. This reduces cost and space requirements, while providing superior protection.

The application field of the SA20 is quite wide, mainly for telephone or industrial installations. It is designed to protect high speed communication systems, such as T1, ISDN, ADSL, Ethernet, and Cable Modems. It is also designed to protect industrial electronics equipment against lighting storms or other transients. For example, it can be used to protect electrical equipment against transients caused by motor starters, switching operations, or welding operations.

The working principle of the SA20 is fairly simple. When a surge voltage is applied to the device, the two SCRs are activated. They will absorb the excess voltage, thus protecting the protected device from excess power levels. As the SCRs are already in a reverse-biased condition, there are no extra switching delays. If the surge current becomes too large, the SCRs will break down so no harm is done to the protected equipment.

To sum up, the SA20 is a Thyristor Surge Protector designed for a wide range of applications. Its fast response time, capability of withstanding high temperatures, and cost-effective design makes it an ideal choice for protecting high speed communication systems and industrial electronics equipment against transients.