Omron D4NS-1AF Safety Door Switch
The Omron D4NS-1AF Safety Door Switch provides 1-Conduit type, and a Type 2 interlock featuring Low level coded coding for enhanced operator protection. Built to withstand harsh industrial environments, it offers a robust IP67 protection rating, supports 0.05 to 0.5 m/s operating speed, and ensures dependable performance with a 10 mm min. direct opening travel. With 25 mΩ max. contact resistance, 300 V rated insulation voltage, 100 MΩ min. insulation resistance, and a 2 × 2 mm min contact gap, it delivers safe and consistent operation. Manufactured by Omron and listed under Omron Safety Door Switch solutions, this model belongs to the D4NS Series.
| Brand | Omron |
| Product Type | Safety Door Switch |
| Model Number | D4NS-1AF |
Omron D4NS-1AF Safety Door Switch - Technical Specifications
| Specification | Value |
|---|---|
| Type | 1-Conduit type |
| Contact configuration | Slow-action, 1NC/1NO |
| 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 |
Omron is a global leader in industrial automation and control solutions. With decades of engineering innovation, the company is known for producing high-performance sensors, relays, PLCs, and safety components.
The Omron D4NS-1AF is a Type 2 safety door switch designed to monitor and control access to hazardous machine areas. It features a 1-conduit entry design and uses slow-action contacts (1NC/1NO) to safely interrupt and signal machine stop conditions. The actuator is low-level coded, which offers basic protection against tampering while keeping installation simple. This model is rated IP67, providing excellent resistance to dust and temporary water immersion. It operates at speeds between 0.05 to 0.5 m/s and requires a direct opening force of at least 60 N to trigger mechanical separation of the contacts — ensuring reliable disconnection during emergency door openings. The contact resistance is limited to 25 mΩ, with a rated insulation voltage of 300 V and 100 MΩ insulation resistance, which ensures dependable electrical performance. The D4NS-1AF can withstand vibration (10–55 Hz) and shock up to 1,000 m/s², making it suitable for industrial environments. It functions reliably in temperatures from −30°C to 70°C and up to 95% humidity.
Applications of D4NS-1AF Safety Door Switch
The D4NS-1AF is typically installed on access doors of CNC machines, robot enclosures, and packaging equipment. When the door is opened, the switch sends a signal to stop the machine immediately, preventing injuries from moving parts. This helps maintenance teams safely service the equipment without risk of accidental restart. In robotic work cells, the switch is mounted on guard doors or sliding panels. It ensures the robot halts when a technician enters, protecting both the operator and the machinery. In conveyor or filling systems, the switch is used to monitor access points that are frequently opened during operation. Its compact size and high durability make it ideal for tight spaces where reliability is critical. In training labs or skill development centers, the D4NS-1AF helps students learn how safety interlocks function in real-world industrial automation. It teaches future engineers the importance of contact ratings, wiring logic, and how safety standards are applied through simple, hands-on examples.
