Omron D4NL-4FFA-B Safety Door Switch
Omron D4NL-4FFA-B is a 24 VDC guard lock safety door switch for protective-door interlocking and controlled access to industrial machinery. Its mechanical lock with solenoid release keeps the guard mechanically locked until release is permitted, while the 2NC/1NO + 2NC contact arrangement supports guard and lock status monitoring. An M20 conduit provides the wiring connection, and a Type 2 low-level coded interlock detects guard position. IP67 protection supports industrial machine safety installations, with 60 N minimum direct opening force and 10 mm minimum travel. The D4NL-4FFA-B belongs to the D4NL series within the machine safety interlock range from Omron industrial safety products for guard locking and access monitoring.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NL-4FFA-B |
Omron D4NL-4FFA-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/1NO+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-4FFA-B Guard Lock Safety Door Switch uses a 24 VDC solenoid with a mechanical lock and solenoid release mechanism for controlling access through protective machine doors. Its 2NC/1NO + 2NC contact arrangement provides normally closed and normally open switching paths for monitoring guard and lock status. An M20 conduit supports machine wiring, while the Type 2 low-level coded interlock provides mechanical guard-position detection. IP67 enclosure protection supports industrial machine safety installations where dust or moisture resistance is required.
The direct opening mechanism provides 60 N minimum force with 10 mm minimum travel, while operating speed ranges from 0.05 to 0.5 m/s. An orange LED supports 10 to 115 VAC/VDC indication for visible status information. Its primary semantic relationships are mechanical guard locking, solenoid release, protective-door detection, contact monitoring and machine access control. The M20 connection and 2NC/1NO + 2NC arrangement further distinguish this model within the D4NL guard lock safety switch family. These attributes are more useful for product selection than filling the page with secondary environmental or resistance values. The mechanical lock controls the guard while the contacts provide status information to the associated safety circuit. For the same M20 conduit and 2NC/1NO + 2NC contact configuration but with solenoid locking and mechanical release, the D4NL-4FFG-B provides the closest functional comparison.
