【optocoupler isolation】Using SMT optocoupler isolation, it has strong driving ability and stable performance; trigger current is 5mA. 【fault-tolerant design】This relay adopted fault-tolerant design, the relay will not move even if the control line is broken. 【wire jumper】Modules can be triggered by setting high or low levels through wire jumper; equipped with 4 fixed screw holes, convenient to use and install. 【connect directly 】The interface design is humanized. All interfaces can be directly connected through the terminal, which is very convenient. 【5V/12V/24V】Module operating voltage is 5V,12V,24V for choice.Power indicator light (green), 4-way relay state indicator light (red)., Manufacturer: Hilitand