Omron D4NL-4DFA-B Safety Door Switch
Omron D4NL-4DFA-B is a 24 VDC guard lock safety door switch designed to secure protective doors while supporting machine guard monitoring. It uses a mechanical lock with solenoid release, while the 2NC + 2NC contact configuration provides normally closed switching paths for guard and lock status. An M20 conduit supports machine wiring, and the Type 2 low-level coded interlock provides mechanical guard-position detection. IP67 enclosure protection suits industrial machine installations, while the direct opening mechanism provides 60 N minimum force with 10 mm minimum travel. The D4NL-4DFA-B belongs to the D4NL series within the guard lock safety switch range from Omron machine safety products for protective access and safety interlocking.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NL-4DFA-B |
Omron D4NL-4DFA-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-4DFA-B Guard Lock Safety Door Switch combines a 24 VDC solenoid with a mechanical lock and solenoid release mechanism for protective machine access. Its 2NC + 2NC contact configuration provides normally closed switching paths for monitoring guard and lock conditions within the machine safety circuit. An M20 conduit provides the wiring connection, while a Type 2 low-level coded interlock supports mechanical guard-position detection. IP67 enclosure protection supports industrial safety installations where dust or moisture may be present.
The direct opening mechanism provides 60 N minimum force with 10 mm minimum travel, and operating speed ranges from 0.05 to 0.5 m/s. An orange LED supports 10 to 115 VAC/VDC indication for status visibility. The mechanical lock and solenoid release arrangement is the key functional relationship because it defines how access to the guarded area is controlled. Together with the 2NC + 2NC contacts and M20 conduit, it connects the D4NL-4DFA-B with guard lock safety switches, protective doors, machine access control and safety circuit monitoring. This model can therefore be differentiated by lock method, contact arrangement and conduit format instead of less useful secondary specifications. For another M20 D4NL model using mechanical locking with solenoid release but a 2NC/1NO + 2NC contact configuration, the D4NL-4FFA-B provides a closely related configuration.
