Various classification principles of relays

According to the principle of action

1. A relay that produces a predetermined response by the relative motion of mechanical components under the action of current in the input circuit.
It includes DC electromagnetic relay, AC electromagnetic relay, magnetic holding relay, polarization relay, reed relay, energy-saving power relay.
(1) DC electromagnetic relay: The electromagnetic relay in which the control current in the input circuit is DC.
(2) AC electromagnetic relay: The electromagnetic current relay whose control current in the input circuit is AC.
(3) Magnetic holding relay: The magnetic steel is introduced into the magnetic circuit. After the relay coil is de-energized, the armature of the relay can still maintain the state when the coil is energized, and has two stable states.
(4) Polarized relay: A DC relay whose state changes depending on the polarity of the input excitation amount.
(5) Reed relay: A relay that opens, closes, or switches a line by the action of a reed that is sealed in the tube and has a dual function of the contact reed and the armature magnetic circuit.
(6) Energy-saving power relay: The control current in the input circuit is an AC electromagnetic relay, but its current is large (generally 30-100A), small size, power-saving function.
2. Solid state relay input and output functions are relays that are completed by electronic components without mechanical moving parts.
3. Time relay When the input signal is added or removed, the output part needs to delay or limit the time to close or disconnect the relay of the controlled line until the specified time.
4. Temperature relay The relay that acts when the outside temperature reaches the specified value.
5. Wind speed relay When the speed of the wind reaches a certain value, the controlled circuit will be turned on or off.
6. Acceleration relay When the acceleration of the moving object reaches the specified value, the controlled circuit will be turned on or off.
7. Other types of relays such as optical relays, acoustic relays, thermal relays, etc.

More Details: Single Dual Coil Latching Relay