Omron D4NL-4EFA-B Safety Door Switch
Omron D4NL-4EFA-B is a 24 VDC guard lock safety door switch using mechanical locking with solenoid release for controlled access through protective machine doors. Its 2NC + 2NC contact configuration provides normally closed switching paths for monitoring guard and lock conditions, while the M20 conduit supports machine wiring. A Type 2 low-level coded interlock provides mechanical guard-position detection, and the direct opening mechanism delivers 60 N minimum force with 10 mm minimum travel. IP67 protection supports industrial safety installations. The D4NL-4EFA-B belongs to the D4NL Series within the guard lock safety switch range from Omron machine safety products, connecting mechanical guard locking, controlled release and safety circuit monitoring.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NL-4EFA-B |
Omron D4NL-4EFA-B Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Solenoid voltage/ indicator | Solenoid: 24 VDC, Orange LED: 10 to 115 VAC/VDC |
| Lock and release types | Mechanical lock Solenoid release |
| Contact configuration | 2NC+2NC |
| Conduit outlet/Connector | M20 |
| Interlock type | Type 2 |
| Coding level | Low level coded |
| Degree of protection | IP67 |
| Operating speed | 0.05 to 0.5 m/s |
| Direct opening force | 60 N min |
| Direct opening travel | 10 mm min |
| Contact resistance | 25 mΩ max. |
| Rated insulation voltage (Ui) | 300 V |
| Rated frequency | 50/60 Hz |
| Insulation resistance | 100 MΩ min. |
| Contact gap | 2 × 2 mm min |
| Vibration resistance | Malfunction 10 to 55 Hz, 0.75 mm single amplitude |
| Shock resistance | Destruction 1,000 m/s2 min. Malfunction 100 m/s2 min. |
| Ambient operating temperature | −10 to 55°C |
| Ambient operating humidity | 95% max |
| Weight | Approx. 370 g |
The Omron D4NL-4EFA-B Guard Lock Safety Door Switch operates with a 24 VDC solenoid and uses mechanical locking with solenoid release for controlled access through protective machine doors. Its 2NC + 2NC contact configuration provides normally closed switching paths for monitoring guard and lock conditions. An M20 conduit provides the machine wiring connection, while a Type 2 low-level coded interlock supports mechanical guard-position detection. The direct opening mechanism provides 60 N minimum force with 10 mm minimum travel, and IP67 protection supports industrial machine safety installations. The key product relationships are mechanical guard locking, solenoid release, 2NC + 2NC contacts, M20 wiring and protective access monitoring. These functional attributes distinguish the model more effectively than secondary environmental or resistance specifications. The mechanical lock secures the protective guard, while the solenoid provides controlled release and the contacts communicate status to the associated safety circuit. An orange LED supports 10 to 115 VAC/VDC indication for visible operating status. Within the D4NL family, conduit format, lock method and contact arrangement are useful selection attributes. For an M20 D4NL model using the same 2NC + 2NC contact configuration but solenoid locking with mechanical release, the D4NL-4EFG-B provides the closest functional comparison.
