Interlocking relay module is an implement for two doors egress controlling ,such as bank, prison ect. When the first door opens and close properly, the second door will open. Interlocking relay module is the ideal choice for the purpose of interlocking door control project, which is easy to be installed, professional and durable and create a more safe occasion for you.
When the power off, NC contact of the relay will switch to NO contact for output, for the use of remote surveillance to make the whole system more safe.