1. Classified according to the working principle or structural characteristics of the relay module

1) Electromagnetic relay: using the circuit inside the input circuit in the electromagnet core

An electrical relay that works with the suction generated between the armatures.

2) Solid state relay: A type of relay in which the electronic component performs its function without mechanical moving parts, and the input and output are isolated.

3) Temperature relay: A relay that operates when the outside temperature reaches a given value.

4) Reed relay: a relay that opens, closes or switches the line by using a reed action that is sealed in the tube and has the dual action of the electric spring and the armature magnetic circuit.

5) Time relay: When adding or removing the input signal, the output part needs to delay or limit the time to close or open its controlled line relay until the specified time.

6) High-frequency relay: A relay used to switch high-frequency, RF lines with minimal loss.

7) Polarized relay: A relay that has a polarized magnetic field and a control action that operates in conjunction with a magnetic field generated by a control coil. The direction of operation of the relay depends on the direction of the current flowing through the control coil.

8) Other types of relays: such as optical relays, acoustic relays, thermal relays, instrumentation relays, Hall effect relays, differential relays, etc.

2, according to the size of the relay module

1) Micro relay

2) Ultra-small miniature relay

3) Small miniature relay

Note: For sealed or enclosed relays, the dimensions are the maximum dimensions of the relay body in three mutually perpendicular directions, excluding the dimensions of the mounting, extraction, rib, crimp, flange and seal welds.