Advantages of static relay over electromagnetic relay
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No moving contacts; hence associated problems of arcing, contact bounce, erosion, replacement of contacts
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Low power consumption as low as 1mW
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No gravity effect on operation of static relays. Hence can be used in vessels ie, ships, aircrafts etc.
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A single relay can perform several functions like over current, under voltage, single phasing protection by incorporating respective functional blocks. This is not possible in electromagnetic relays
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Static relay is compact
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Superior operating characteristics and accuracy
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Static relay can think , programmable operation is possible with static relay
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Effect of vibration is nil, hence can be used in earthquake-prone areas o Simplified testing and servicing. Can convert even non-electrical quantities to electrical in conjunction with transducers.