Omron D4NS-2DF Safety Door Switch
Omron D4NS-2DF is an M20 safety door switch designed to monitor protective doors and movable machine guards in industrial safety systems. Its 1-conduit construction uses an M20 connection, while the slow-action 3NC contact configuration provides 3 normally closed paths for safety circuit monitoring. A Type 2 low-level coded interlock supports mechanical guard-position detection, and the direct opening mechanism provides 10 mm minimum travel. IP67 protection supports machine installations exposed to dust or moisture. The D4NS-2DF belongs to the D4NS Series within the machine safety door switch range from Omron industrial safety products, linking guard movement, direct opening contacts and machine safety monitoring.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-2DF |
Omron D4NS-2DF Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action,3NC |
| 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 | <Standard type> 60 N min.; <High pull-force type> 80 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: 300 m/s2 min |
| Ambient operating temperature | −30 to 70°C (with no icing) |
| Ambient operating humidity | 95% max |
| Weight | Approx. 96 g |
The Omron D4NS-2DF Safety Door Switch combines a 1-conduit M20 connection with slow-action 3NC contacts for protective machine guard monitoring. Its 3 normally closed contacts provide multiple switching paths for the associated safety circuit, while the M20 conduit defines the wiring interface for installation. A Type 2 low-level coded interlock mechanically detects the position of the protective door. The direct opening mechanism supports positive contact separation when the guard moves from its monitored position, with 10 mm minimum direct opening travel. Direct opening force is 60 N minimum for standard types and 80 N minimum for high pull-force types. IP67 enclosure protection supports industrial machine installations where dust or moisture may reach the switch, and operating speed ranges from 0.05 to 0.5 m/s. The key product relationships are M20 wiring, 3NC contact switching, protective-door detection, mechanical interlocking and machine safety monitoring. These attributes distinguish the model without relying on low-value weight or resistance data. Contact configuration and conduit type also provide practical comparison points across the D4NS family. For a related M20 D4NS model using slow-action 2NC contacts instead of 3NC, the D4NS-4BF provides a useful sibling configuration.
