Omron D4NS-4CF Safety Door Switch
Omron D4NS-4CF is an M20 2NC/1NO safety door switch designed for mechanical monitoring of protective doors and movable machine guards. Its 1-conduit construction provides an M20 wiring connection, while the slow-action 2NC/1NO contact configuration combines normally closed safety paths with a normally open switching path. A Type 2 low-level coded interlock supports guard-position detection, and the direct opening mechanism provides 10 mm minimum travel. IP67 protection supports industrial machine safety installations. The D4NS-4CF belongs to the D4NS Series within the safety door interlock switch range from Omron industrial safety products, connecting machine guarding, protective access, contact monitoring and safety control.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-4CF |
Omron D4NS-4CF Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action,2NC/1NO |
| 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-4CF Safety Door Switch combines an M20 conduit connection with slow-action 2NC/1NO contacts for mechanical monitoring of protective machine doors. Its 2 normally closed contacts provide safety switching paths, while the normally open contact provides an additional switching path for the associated control circuit. A Type 2 low-level coded interlock provides mechanical guard-position detection and links actuator movement with switch operation. The direct opening mechanism supports positive contact separation, 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. Operating speed ranges from 0.05 to 0.5 m/s, while IP67 protection supports industrial machine safety installations. The key semantic relationships are 2NC/1NO contacts, M20 wiring, protective-door monitoring, machine guard detection and safety interlocking. These functional characteristics provide useful product-selection context without relying on secondary weight or resistance specifications. Within the D4NS Series, conduit type and contact configuration provide clear distinctions between closely related models. The switch therefore connects mechanical guard movement with safety and status switching paths. For the same slow-action 2NC/1NO contact arrangement with a G1/2 conduit connection, the D4NS-2CF provides the closest related configuration.
