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Onboard EL817 photocoupler£¬ high optoelectronic isolation anti-interference ability; Onboard 12V£¬ 10A / AC 250V£¬ 10A / DC 30V relay; Relay lifespan continuous pull-in 100£¬000 time; The module can connect to singlechip directly£¬ with output signal indicator; The module is with diode follow current protection£¬ short response time