U-shaped snap-type electromagnetic relay is a common electrical switching device. It consists of a U-shaped magnet and an iron core.
The working principle is: when the control current of the relay passes through the coil, the magnetic field generated in the coil attracts the iron core, causing the iron core and the magnet to close. In the closed state, the contacts of the relay conduct, conducting current in the circuit to the load.
When the control current is disconnected, the magnetic field in the coil disappears, the iron core loses its attraction, and the spring pops up the iron core, causing the contacts to open and the current in the circuit to stop flowing.
This working principle allows the U-shaped snap-type electromagnetic relay to play the role of opening and closing circuits in the circuit, and is often used in automatic control, circuit protection, power transmission and other fields.