Omron D4NL-1DFA-BS Safety Door Switch
The Omron D4NL-1DFA-BS is a 24 VDC guard lock safety switch with a 2NC/1NO + 1NC/1NO contact configuration for monitoring protective-door and lock status. It uses a mechanical lock with solenoid release to support controlled access to guarded areas of industrial machinery. The Type 2 low-level coded interlock provides guard-position monitoring, while the IP67 enclosure supports installation in industrial environments. A direct opening mechanism supports mechanical contact opening, and an orange LED rated for 10 to 115 VAC/VDC provides indication. The D4NL-1DFA-BS belongs to the D4NL series within the guard lock safety switch range from Omron machine safety products.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NL-1DFA-BS |
Omron D4NL-1DFA-BS 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+1NC/1NO |
| 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-1DFA-BS Guard Lock Safety Switch uses a Type 2 low-level coded interlock and provides IP67 enclosure protection. A mechanical lock with solenoid release controls the locking arrangement, while the orange LED supports 10 to 115 VAC/VDC. The switch operates at speeds from 0.05 to 0.5 m/s and provides a direct opening force of 60 N minimum with 10 mm minimum travel. Its 2NC/1NO + 1NC/1NO contact configuration provides switching for protective-door and lock-status monitoring.
Electrical specifications include 25 mΩ maximum contact resistance, a 300 V rated insulation voltage, 100 MΩ minimum insulation resistance, and a 2 × 2 mm minimum contact gap. Rated frequency is 50/60 Hz. Malfunction vibration resistance covers 10 to 55 Hz at 0.75 mm single amplitude, while shock resistance is 1,000 m/s² minimum for destruction and 100 m/s² minimum for malfunction. The switch operates from −10 to 55°C, supports ambient humidity up to 95%. A closely related D4NL option is the D4NL-1AFA-B, which uses a 1NC/1NO + 1NC/1NO contact configuration for an alternative guard and lock monitoring arrangement.
