Omron D4NS-4BF-NPT Safety Door Switch
Omron D4NS-4BF-NPT is a 1-conduit safety door switch featuring slow-action 2NC contacts and a 1/2-14NPT conduit connection. The 2NC contact arrangement provides normally closed switching paths for protective-door monitoring within machine safety circuits. A Type 2 low-level coded interlock provides mechanical guard-position detection, while the direct opening mechanism supports positive contact separation when the protective guard is opened. Standard versions provide 60 N minimum direct opening force, with 80 N minimum for high pull-force types and 10 mm minimum travel. The D4NS-4BF-NPT belongs to the D4NS series within the machine guard safety switch range from Omron industrial safety products.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-4BF-NPT |
Omron D4NS-4BF-NPT Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action,2NC |
| 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-4BF-NPT Safety Door Switch uses a 1-conduit construction with slow-action 2NC contacts for protective machine guard monitoring. Its 1/2-14NPT conduit outlet provides the wiring connection, while the two normally closed contacts provide switching paths for safety circuit integration. A Type 2 low-level coded interlock supports mechanical guard-position detection, and IP67 enclosure protection supports industrial installations where the safety switch may encounter dust or moisture during operation.
The direct opening mechanism provides 60 N minimum force for the standard type and 80 N minimum for the high pull-force type, with 10 mm minimum travel. Operating speed ranges from 0.05 to 0.5 m/s. The combination of 2NC contacts, NPT conduit entry and positive opening provides the main selection context for this model. It connects naturally with safety door monitoring, machine guard detection, access protection and safety control circuits without depending on low-value specifications for topical coverage. When the protective door is operated, the direct opening mechanism supports mechanical separation of the safety contacts. Engineers comparing D4NS models can therefore select primarily by contact configuration, conduit arrangement and required machine guard circuit. For the same 1/2-14NPT conduit format with slow-action 1NC/1NO contacts instead of 2NC, the D4NS-4AF-NPT provides the closest related configuration.
