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Types of Relay

Buchholz Relay
Buchholz Relay

Buchholz relay is a type of oil and gas actuated protection relay universally used on all oil immersed transformers having rating more than 500 kVA. Buchholz relay is not provided in relays having rating below 500 kVA from the point of view of economic considerations.

source: owlcation.com
Contacor Relay
Contacor Relay

A contactor is a special type of Relay used to switch on or off electrical circuit. It is basically used where the current carrying capacity needs to be more. Also it is compact in size and can easily be mounted in the field.

source: quora.com
Latching Relay
Latching Relay

A latching relay is an electromechanical switch. Latching relays are electronic parts that are used to control large flow of electrical current with smaller flow of current. Relays are typically used when small continuous electrical currents must be used.

Machine Tool Relay
Machine Tool Relay

Conventionally, the term “machine tool relay” is applied to NEMA-style relays. Today, IEC relays, often called “control relays,” are also applied for the same purposes. In this article, the term machine tool relay will be used interchangeably for both NEMA-style and IEC-style relays.

source: ecmweb.com
Mercury Wetted Relay
Mercury Wetted Relay

A mercury-wetted reed relay is a form of reed relay in which the contacts are wetted with mercury.

Overload Protection Relay
Overload Protection Relay

Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protective relays".

Polarized Relay
Polarized Relay

Panasonic Difference between Polarized and Non-polarized Relays

Reed Relay
Reed Relay

A reed relay is a type of relay that uses an electromagnet to control one or more reed switches. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them.