1NC/1NO Safety Contacts
The Omron D4NS-4AF provides one normally closed safety contact and one normally open contact with slow-action switching for monitoring compatible industrial machine guards.
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Omron
Omron D4NS-4AF Safety Door Switch Industrial Machine Guarding Switch
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$29.00
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | Omron |
| Model Number | D4NS-4AF |
| Product Category | Safety Door Interlock Switch |
| Product Series | D4NS |
| Switch Type | Mechanical Safety Door Switch with Separate Operation Key |
| Actuation Method | Tongue / Separate-Key Operated |
| Contact Configuration | 1 Normally Closed + 1 Normally Open (1NC/1NO) |
| Contact Operation | Slow-Action |
| Direct Opening Mechanism | Supported on NC Safety Contact |
| Conduit Configuration | Single Conduit Entry |
| Conduit Size | M20 |
| Head Material | Plastic / Resin |
| Actuator Included | No; Operation Key Sold Separately |
| Compatible Operation Keys | D4DS-K1, D4DS-K2, D4DS-K3 and D4DS-K5 |
| Safety Interlock Classification | Type 2, EN ISO 14119 |
| Actuator Coding Level | Low Level Coded |
| Degree of Protection | IP67, Subject to Installation Conditions |
| Rated Insulation Voltage | 300 V |
| Rated Thermal Current | 10 A |
| AC-15 Contact Rating | 3 A at 240 VAC |
| DC-13 Contact Rating | 0.27 A at 250 VDC |
| Direct Opening Force | 60 N Minimum |
| Direct Opening Travel | 10 mm Minimum |
| Operating Speed | 0.05 to 0.5 m/s |
| Maximum Operating Frequency | 30 Operations per Minute |
| Mechanical Durability | 1,000,000 Operations Minimum for Standard Type |
| Electrical Durability | 500,000 Operations Minimum at 3 A Resistive Load, 250 VAC |
| Operating Temperature | -30 to +70°C, Without Icing |
| Operating Humidity | 95% RH Maximum |
| Protection Against Electric Shock | Class II, Double Insulation |
| Approximate Weight | 96 g |
| Applicable Safety Standards | EN 60947-5-1, EN ISO 14119 |
| UL Certification Reference | UL 508, File E76675 |
| Manufacturer Product Reference | Omron D4NS-4AF |
Key Features
Direct Opening Safety Mechanism
The normally closed contact incorporates a direct opening mechanism designed to positively separate the safety contact when the operation key is withdrawn under the specified operating conditions.
M20 Single-Conduit Connection
The switch has one M20 conduit opening for electrical wiring. This exact model does not include an M20-to-NPT adapter, so the connection requirements should be checked before installation.
Separate-Key Door Interlocking
The tongue-operated design monitors the position of machine access doors using a separately selected D4DS operation key. The switch does not provide solenoid guard locking.
IP67 Protection
The D4NS series is specified to IP67 under the applicable test conditions. Proper installation and protection from foreign material entering the operation-key opening remain necessary.
Industrial Safety Integration
The Type 2 interlocking switch can be incorporated into an appropriately designed machinery safety circuit with a compatible safety relay or safety controller and validated system wiring.
Applications
- Industrial machine access door monitoring
- Safety guard interlock systems
- Packaging machinery access switches
- Robotic cell protective door monitoring
- Automated assembly equipment guarding
- Production line safety circuits
- Industrial safety control panel integration
- Machine safety switch maintenance and replacement
Purchase Information
We support online purchase of the Omron D4NS-4AF Safety Door Interlock Switch. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is the Omron D4NS-4AF?
It is a D4NS series mechanical safety door interlock switch with a separate-key actuator design, 1NC/1NO slow-action contacts and one M20 conduit entry.
What is the contact configuration?
The D4NS-4AF provides one normally closed contact and one normally open contact using a slow-action switching mechanism.
What conduit size does it use?
The switch has one M20 conduit opening. The standard D4NS-4AF does not include an M20-to-NPT adapter.
Does D4NS-4AF include an operation key?
No. Omron specifies that operation keys are sold separately. Compatible key models include D4DS-K1, D4DS-K2, D4DS-K3 and D4DS-K5.
Does this switch lock the safety door?
No. The D4NS-4AF monitors door position but does not provide solenoid guard locking. Applications requiring guard locking need a suitable locking interlock device.
Does the switch require a 24 VDC power supply?
The D4NS-4AF is a mechanical contact switch and does not require a dedicated electronic supply for its switching mechanism. The connected safety circuit must respect the applicable contact ratings.
What is the IP protection rating?
Omron specifies IP67 protection under the relevant test conditions. Proper mounting and protection of the key opening are required.
What is the direct opening force?
The standard D4NS series specifies a minimum direct opening force of 60 N and minimum direct opening travel of 10 mm.
What are the electrical contact ratings?
The published ratings include AC-15 at 3 A and 240 VAC and DC-13 at 0.27 A and 250 VDC. Circuit design and protective devices must comply with the manufacturer requirements.
What is the operating temperature range?
The specified ambient operating temperature is -30 to +70°C, without icing.
Can D4NS-4AF replace D4NS-2AF?
Do not assume a direct replacement. D4NS-4AF uses an M20 conduit entry, while D4NS-2AF uses G1/2. Verify the electrical wiring, conduit, operation key, mounting and safety circuit requirements.
What should be checked before ordering?
Confirm model D4NS-4AF, 1NC/1NO slow-action contacts, M20 single-conduit entry, separately purchased operation key, mechanical mounting, contact ratings, environmental requirements and the validated machine safety application.
Need help confirming a model?
Send us your part number and technical requirements.
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