Omron D4NL-4HFA-B Safety Door Switch
Omron D4NL-4HFA-B is a 24 VDC guard lock safety door switch designed for protective-door monitoring and machine guard interlocking. Its mechanical lock with solenoid release provides controlled guard access, while the 3NC + 2NC contact configuration offers multiple normally closed switching paths for safety monitoring. An M20 conduit provides the wiring connection, and a Type 2 low-level coded interlock supports mechanical guard-position detection. The switch provides IP67 enclosure protection and a direct opening mechanism rated at 60 N minimum force with 10 mm minimum travel. The D4NL-4HFA-B belongs to the D4NL series within the machine safety interlock range from Omron safety control products.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NL-4HFA-B |
Omron D4NL-4HFA-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 | 3NC+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-4HFA-B Guard Lock Safety Door Switch combines a 24 VDC solenoid with a mechanical lock and solenoid release arrangement for controlled machine access. Its 3NC + 2NC contact configuration provides multiple normally closed switching paths for protective-door and lock status monitoring. An M20 conduit supports wiring into the machine safety circuit, while a Type 2 low-level coded interlock provides mechanical guard-position detection. IP67 enclosure protection supports installation around industrial machinery where dust and moisture resistance is required.
The direct opening mechanism provides 60 N minimum force and 10 mm minimum travel, supporting positive mechanical contact separation during protective-door operation. The switch accepts guard movement from 0.05 to 0.5 m/s, while an orange LED supports 10 to 115 VAC/VDC indication. Its combination of mechanical guard locking, solenoid release, M20 cable entry and multiple NC contacts makes these the primary attributes for model selection. Within a machine safety system, the switch can provide guard-position and lock-state signals while mechanically controlling access to the protected area. This creates a clear entity relationship between the D4NL-4HFA-B, guard locking, protective doors, safety circuits and machine access control. For another M20 D4NL guard lock switch using a solenoid lock with mechanical release and 2NC + 2NC contacts, the D4NL-4DFG-B provides a related configuration.
