remote interlock

Hi Everyone,
"Attach remote interlock, if desired (not required)."
Can anyone help me with this phrase?
Thanks

Sorry, here is some more info on the subject.
I need the translation into Spanish:
Remote Interlock Connecter

http://www.sensorcentral.com/common/img/spacer.gif The remote interlock connecter stops laser irradiation when the connector terminal is opened. It is intended to be used by connecting it to an emergency stop switch, etc. by the user.

Mi propuesta sería "conector remoto de cerraduras", auqnue esperaría a ver que te dice algún otro forero.

Guillermol

Gracias, Guillermo.
Use "bloqueo de seguridad remoto" por el contexto.