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Wire bridge: modules can be triggered by adjusting high or low levels via the wire bridge. Equipped with 4 fixed screw holes, convenient to use and install. Fault-tolerant design: This relay is a fault-tolerant design. The relay does not move even if the control line is interrupted. Optocoupler insulation: thanks to the use of the SMT optocoupler insulation, a strong driving ability and stable performance are achieved. The trigger current is 5 mA. Direct connection: The interface design is humanised. All interfaces can be connected directly via the terminal, which is very practical. 5 V / 12 V / 24 V: the operating voltage of the module is optionally 5 V, 12 V, 24 V. Power indicator (green), 4-way relay status indicator (red).