DTMF Controlled Relays Module 4 Channel with Isolation Remote Control and Systems Automation Sound Line Decoding for Multiple Circuit Management

Equipped with Songle 10A contacts relays, this module supports both conditioning and direct current loads, featuring complete domain, denial, and NC terminals for each channel, allowing complimentary switching between normally open and normally closed configurations Each channel circuit is fully isolated to mutual intervention, ensuring that a short circuit or overload on single channel does not affect others, enhancing overall device safe PCB has four corner holes for screw fixation, allowing easy embedding into electrical control boxes, for equipment integration and retrofitting, with remote control that avoids packet loss and latency issues This 4 channel DTMF transmit module uses a 3.5Mm sound cable to transmit call signals, with each keypad digit binding to a specific channel change for interconnected control, ensuring denial intervention from electromagnetic shielding, and includes a matching sound cable for plug and play use Integrated potential regulator chip provides stable power, with high tolerance to potential fluctuations, enabling straight connection to industrial control direct current power sources for consistent long term continuous operations