The working principle of high-power relays is to activate a certain input quantity (such as voltage, current, temperature, speed, pressure, etc.) when it reaches a predetermined value, in order to change the working state of the control circuit and achieve the predetermined control or protection purpose. During this process, high-power relays mainly play a role in transmitting signals.
Contact form of high-power relay:
1. When the coil of the dynamic closing type (H type, foreign: A type) is not powered on, the two contacts are disconnected. After being powered on, the two contacts are closed. Represented by the pinyin prefix "H" in Chinese.
2. Dynamic break type (D-type, foreign: B-type): When the coil is not powered on, the two contacts are closed, and when powered on, the two contacts open. Use the hyphenated pinyin prefix "D" to indicate.
3. Conversion type (Z type, foreign: C type) This is the contact group type. This type of contact group has three contacts, with a moving contact in the middle and a stationary contact in the upper and lower parts. When the coil is not powered on, the moving contact and one of the stationary contacts are disconnected and the other is closed. After the coil is powered on, the moving contact moves, causing the previously disconnected to become closed and the previously closed to become open, achieving the purpose of conversion. This type of contact group is called a conversion contact. Represented by the pinyin prefix "z" of the character "Zhuan".
The working principle of high-power relays
Oct 15, 2023
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