How many types of relays are there?
Release time:
2023-02-11
Electromagnetic relay: An electric relay that works by using the attraction force generated between the electromagnetic iron core and armature in the input circuit. (2) Solid-state relay: A relay in which electronic components perform their functions without mechanical moving parts, and the input and output are isolated. (3) Temperature relay: A relay that operates when the ambient temperature reaches a given value.
1. Classification by working principle or structural characteristics of relays:
(1) Electromagnetic relay: An electrical relay that works by using the suction force generated between the electromagnet core and armature in the input circuit current.
(2) Solid-state relay: A relay in which electronic components perform their functions without mechanical moving parts, and the input and output are isolated.
(3) Temperature relay: A relay that operates when the ambient temperature reaches a given value.
(4) Reed relay: A relay that uses the action of a reed switch sealed in a tube, which has both a reed switch and an armature magnetic circuit, to open, close, or switch circuits.
(5) Time relay: A relay whose output needs to be delayed or timed to a specified time before closing or opening the controlled circuit when the input signal is added or removed.
(6) High-frequency relay: A relay used to switch high-frequency and radio-frequency circuits with minimal loss.
(7) Polarized relay: A relay that operates by the combined action of a polarized magnetic field and the magnetic field generated by the control current passing through the control coil. The direction of relay operation depends on the direction of the current flowing through the control coil.
(8) Other types of relays: such as photoelectric relays, acoustic relays, thermal relays, instrument relays, Hall effect relays, differential relays, etc.
2. Classification by relay size:
(1) Miniature relay: A relay whose longest side is no more than 10 mm.
(2) Subminiature relay: A relay whose longest side is greater than 10 mm but no more than 25 mm.
(3) Small miniature relay: A relay whose longest side is greater than 25 mm but no more than 50 mm.
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 parts, leads, embossments, edges, flanges, and sealing welds.
3. Classification by relay load:
(1) Low-power relay: A relay with (resistive) 0.1A, 0.2A when the open-circuit voltage is DC 28V.
(2) Low-power relay: A relay with (resistive) 0.5A, 1A when the open-circuit voltage is DC 28V.
(3) Medium-power relay: A relay with (resistive) 2A, 5A when the open-circuit voltage is DC 28V.
(4) High-power relay: A relay with (resistive) 10A, 15A, 20A, 25A, 40A... when the open-circuit voltage is DC 28V.
4. Classification by relay protection characteristics:
(1) Sealed relay: A relay in which the contacts and coils are sealed in a housing by welding or other methods, isolated from the surrounding medium, and with a low leakage rate.
(2) Enclosed relay: A relay in which the contacts and coils are sealed (non-sealed) for protection with a housing.
(3) Open relay: A relay that does not use a protective cover to protect the contacts and coils.
The most commonly used relays in electronic manufacturing are electromagnetic relays and reed relays.
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