Vacuum contactors can be classified into two main types based on their mechanism for holding the contacts closed: magnetic latching type and electrical holding type.

DC solid state relays use semiconductor switching elements, which makes them faster, more reliable, and longer-lasting in many applications.

In summary, the main difference between electrical holding and magnetic holding in a vacuum contactor is the method used to maintain the closed position of the main power contacts when the coil is de-energized. Electrical holding uses an external electrical circuit to provide continuous holding force, while magnetic holding relies on the energy stored in a permanent magnet to maintain the closed position without an external power supply.

8/20μs: Suitable for protection against fast-rising and short-duration surges, such as lightning strikes and rapid switching events.
10/350μs: Suitable for protection against slower-rising and longer-duration surges, often associated with power distribution network switching operations and industrial electrical systems.

It's worth noting that a comprehensive surge protection strategy may involve using both Type 1 and Type 2 SPDs in combination, along with other protective measures, to ensure maximum protection for electrical systems and connected devices.

An effective surge protection strategy often combines the use of both MOVs and spark gaps, along with other protective devices, to provide comprehensive protection against different levels of power surges.

Твердотельное реле (SSR) - это электронное устройство переключения, предоставляющее альтернативу традиционным электромеханическим реле и контакторам. Оно использует полупроводниковые компоненты, обычно устройства типа тиристоров или триаков, для выполнения переключающего действия без движущихся частей. SSR предназначены для управления потоком электрической мощности к нагрузкам, таким как нагреватели, двигатели, лампы и другие электрические устройства.