Which type of relay is operated in both AC and DC?
Answers
Attraction Type Electromagnetic Relays
Attraction Type Electromagnetic Relays
These relays can work with both AC and DC supply and attract a metal bar or a piece of metal when power is supplied to the coil. This can be a plunger being drawn towards the solenoid or an armature being attracted towards the poles of an electromagnet .
Answer:
Solid State Relays (SSRs)
These relays can be designed to work for both AC and DC supply.
Explanation:
Solid State Relays (SSRs)
Unlike electromechanical relays (EMRs), which use coils, fields, springs, and mechanical contacts to control and switch current, a solid state relay or SSR has no moving parts, instead using the electrical and optical properties of semiconductors. performs its input for output isolation and switching functions.
Just like standard electromechanical relays, SSRs provide complete electrical isolation between their input and output contacts, and its output acts like a normal electrical switch because it has a very high, almost infinite resistance when not conducting (open) and a very small resistance to control (closed). Solid state relays can be designed to switch both AC and DC using the output of an SCR, TRIAC, or switching transistor instead of the usual mechanical normally open (NO) contacts.
A solid state relay and an electromechanical relay are essentially similar in that their low voltage input is electrically isolated from the output that turns on and controls the load, electromechanical relays have limited contact and can take up a lot of space and have slower switching speeds, especially large power ones relays and contactors. Solid state relays have no such limitations.
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