1. Wide Compatibility: Suitable for various vacuum contactors and circuit breakers
2. Stable Contact Performance: Silver alloy contacts ensure excellent conductivity and arc resistance
3. Easy Installation: Modular design allows quick mounting on equipment or panels
4. Compact Design: Space-saving structure, ideal for control cabinets
5. Durability: High mechanical and electrical life for intensive operations
Typical Applications
1. Auxiliary control for vacuum contactors
2. Status feedback for vacuum circuit breakers
3. Signal interlocking in high-voltage systems
4. Auxiliary control for electromagnetic devices
5. Monitoring for permanent magnet operating mechanisms
Model meaning
Parameters of NK series auxiliary switch
| Types of current | Closing Conditions | Breaking Conditions | ||||||
| Voltage(V) | Current(A) | COS φ | T₀.₉₅ (ms) | Voltage(V) | Current(A) | COS φ | T₀.₉₅ (ms) | |
| AC | 380 | 7.8 | 0.7±0.05 | 380 | 7.8 | 0.4±0.05 | ||
| DC | 220 | 0.27 | 300±45 | 220 | 0.27 | 300±45 | ||
| AC | 380 | 15 | 0.7±0.05 | 380 | 1.5 | 0.4±0.05 | ||
| DC | 220 | 10 | 300±45 | 220 | 1 | 300±45 | ||
| AC | 380 | 12 | 0.7±0.05 | 380 | 1.2 | 0.4±0.05 | ||
| DC | 220 | 8 | 300±45 | 220 | 0.8 | 300±45 | ||
| AC | 380 | 5 | 0.7±0.05 | 380 | 0.5 | 0.4±0.05 | ||
| DC | 220 | 3 | 300±45 | 220 | 0.3 | 300±45 | ||
| Type | Operating Travel max(mm) | Over Travel max(mm) | Time Delay Gap min(mm) | Operating Force max N | Contact Pressure min N |
| NK-2-1 | 2.5 | 3 | 14 | 0.55 | |
| NK2-1A | 2.5 | 1.5 | 0.3 | 14 | 0.55 |
| NK3-1 | 3 | 1.5 | 20 | 0.8 | |
| NK3-1A | 3 | 1.5 | 0.3 | 20 | 0.8 |
| NK6-1A | 4.5 | 4 | 0.8 | 45 | 1.5 |
| NK7-1A | 3 | 7 | 5.7 | 14 | 0.5 |
| NK8-1A | 3 | 2.5 | 0.5 | 42 | 1.5 |
| NK-1-1 | 3 | 3 | 14 | 0.55 | |
| NK5-1A | 2.1 | 1.5 | 0.5 | 16 | 0.6 |
| NK2G-1A | 2.5 | 1.5 | 0.5 | 20 | 0.8 |
Dimensional drawing
1. Product name, model, quantity
2. Indicate the number of contact pairs and switch sections, type and installation method
3. Whether to use connection accessories
4. If the user has other special requirements, please specify
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