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Question
What is coil surge?
Answer
It is a characteristic of the coil in which a large reverse voltage is momentarily generated when Relays are turned OFF. To deal with this problem, some Relays are equipped with surge-absorbing circuits.
When contacts are used for input, surge-absorbing circuits can be used to extend the service life of Relays, prevent the effects of noise, and minimize the production of carbides and nitric acid caused by arcing.
When semi-conductors, such as transistors, are used for input, reverse voltage is generated and may cause Relays to breakdown.
In most cases it is good to install a surge-absorbing circuit.
Some relays have a built-in surge-absorbing diode (for DC coils). These diodes can also be externally installed.
Comparison of Coil Surges in a 24-VDC Circuit
Comparison of Coil Surges in a 200-VAC Circuit
Other General Purpose Relays FAQ
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Could the Relays become detached from the Sockets if I don't have Hold-down Clips to prevent them from becoming loose?
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What is the life span of the coils when voltage is continuously applied to coils for MY2 AC100V General-purpose Relays?
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Are there restrictions on the direction that the MY General-purpose Relays can be mounted?
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