OMRON D4NL-2FFG-B Guard Lock Safety Door Switch Product Overview The OMRON D4NL-2FFG-B is a guard lock safety-door switch for industrial machinery and protected access points. It combines door position detection with a solenoid locking function. The unit uses a 24 VDC solenoid lock with mechanical release . It is designed to help keep machine guards locked during controlled operating conditions. Key Specifications Parameter Specification Brand OMRON Model D4NL-2FFG-B Product