Omron D4NS-4CF-NPT Safety Door Switch
Omron D4NS-4CF-NPT is a 1-conduit safety door switch with a 1/2-14NPT connection for protective machine guard monitoring. Its slow-action 2NC/1NO contact configuration provides normally closed safety paths together with a normally open switching path for guard status. A Type 2 low-level coded interlock supports mechanical guard-position detection, while IP67 protection suits industrial machine safety installations. The direct opening mechanism provides 60 N minimum force for standard types and 80 N minimum for high pull-force types, with 10 mm minimum travel. The D4NS-4CF-NPT belongs to the D4NS series within the safety door interlock range from Omron machine safety products, supporting protective-door detection and safety circuit switching.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-4CF-NPT |
Omron D4NS-4CF-NPT Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action,2NC/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-4CF-NPT Safety Door Switch uses a 1-conduit construction with a 1/2-14NPT connection and slow-action 2NC/1NO contacts for protective machine guard monitoring. The contact arrangement provides normally closed safety paths together with a normally open switching path for guard status. A Type 2 low-level coded interlock supports mechanical guard-position detection, while IP67 enclosure protection suits industrial machine safety installations where dust or moisture may be present.
The direct opening mechanism provides 60 N minimum force for standard types and 80 N minimum for high pull-force types, with 10 mm minimum travel. Operating speed ranges from 0.05 to 0.5 m/s. The primary model relationships are 1/2-14NPT wiring, 2NC/1NO switching, positive opening and protective-door detection. These characteristics connect the D4NS-4CF-NPT with safety door switches, machine guards, access monitoring and industrial safety circuits. The NPT conduit format is particularly useful for differentiating this model from D4NS versions using M20 or other connection arrangements. When the protective guard changes position, the direct opening mechanism supports mechanical separation of the safety contacts according to the machine safety design. For another 1-conduit D4NS model with a 1/2-14NPT connection but using 1NC/1NO contacts, the D4NS-4AF-NPT provides a closely related configuration.
