More classification of relays, according to the principle of action, dimensions, protection features, contact load, product usage and other categories.

First, according to the principle of action points

1. Electromagnetic relay
A relay which generates a predetermined response by the relative movement of mechanical components under the action of current in the input circuit.
It includes DC electromagnetic relays, AC electromagnetic relays, magnetic latching relays, polarization relays, reed relays, energy-saving power relays.
(1) DC electromagnetic relay: the input relay, relay classification method The control circuit in the DC current electromagnetic relay.
(2) AC electromagnetic relay: the input current control circuit in the electromagnetic relay.
(3) Magnetic Relays: Magnets are introduced into the magnetic circuit. After the relay coil is powered off, the armature of the relay can still maintain the state when the coil is energized, and has two stable states.
(4) Polarization relay: A DC relay whose state changes depending on the polarity of the input excitation.
(5) reed relays: the use of sealed in the tube, with a reed contact and armature magnetic circuit dual action reed to open, close or switch the line relay.
(6) Energy-saving power relay: The input current control circuit for the exchange of electromagnetic relays, but its current (usually 30-100A), small size, power-saving features.

2. Solid State Relays
Input, output function is completed by the electronic components without a mechanical moving parts of a relay.

3 time relay
When adding or removing the input signal, the output relay, the relay part of the classification method to be delayed or limited time to the required time to close or disconnect its charged line relay.

4 temperature relay
When the outside temperature reaches the relay, relay classification method and value of the relay when the action.

5 wind speed relay
When the wind speed reaches a certain value, the charged 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 light relays, sound relay, relays, relays, and other methods of classification thermal relay.