Omron D4NS-4AF-NPT Safety Door Switch
Omron D4NS-4AF-NPT is a 1-conduit safety door switch with a 1/2-14NPT connection for protective-door monitoring. It uses slow-action 1NC/1NO contacts to provide normally closed and normally open switching functions within machine safety circuits. A Type 2 low-level coded interlock supports mechanical guard-position detection, while the direct opening mechanism provides 60 N minimum force on the standard type and 80 N minimum on the high pull-force type. IP67 enclosure protection supports demanding industrial installations, with 10 mm minimum direct opening travel. The D4NS-4AF-NPT belongs to the D4NS series within the industrial safety door switch range from Omron safety control products.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-4AF-NPT |
Omron D4NS-4AF-NPT Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action, 1NC/1NO |
| Conduit outlet/Connector | 1/2-14NPT |
| 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-4AF-NPT Safety Door Switch combines a 1-conduit construction with slow-action 1NC/1NO contacts for protective-door monitoring. Its 1/2-14NPT conduit outlet provides a defined wiring connection, while the normally closed and normally open contacts support guard-position switching within machine safety circuits. A Type 2 low-level coded interlock provides mechanical guard detection, and IP67 enclosure protection supports installation around industrial equipment exposed to dust or moisture.
The direct opening mechanism provides 60 N minimum force for standard versions and 80 N minimum for high pull-force versions, with 10 mm minimum travel. Operating speed ranges from 0.05 to 0.5 m/s. The combination of NPT conduit entry, 1NC/1NO switching and positive opening makes these the primary attributes for selecting this model. It can be associated semantically with machine guards, protective doors, safety interlocks, access monitoring and safety control circuits without adding unrelated specifications. The normally closed contact can support the guard-monitoring path, while the normally open contact provides an additional switching state according to the safety circuit design. For installations requiring the same 1/2-14NPT conduit format but a 2NC contact arrangement instead of 1NC/1NO, the D4NS-4BF-NPT provides the closest related D4NS configuration.
