Mitsubishi Earth Leakage Relays NV-Z
https://sg.mitsubishielectric.com/fa/products/lvd/lvcb/pmerit/elr/index.html
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This kind of relay is an electrical self-holding type, called as compact-economic-type, and can serve to save a space.
The Earth Leakage Relays are classified into the following types,
• NV-ZBA
(small-size economical product)
• NV-ZSA
(general-use product)
• NV-ZHA
(applicable to higher harmonics and surge)
• NV-ZLA
(applicable to higher harmonics and surge)
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Unlike earth leakage circuit breakers, earth leakage relays do not interrupt, only detect a leakage current.
A ZCT (zero-phase current transformer) is used in combination with a relay. The ZCT detects a leakage current, and then the relay sends a signal.