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1.Core Positioning and Scope of Application
The CHINT NP4 Series is an industrial-grade control device with a 22mm mounting diameter. It is suitable for circuit control systems with AC 50/60Hz, rated voltage up to 380V, and DC operating voltage up to 220V. It serves as a control component for magnetic starters, contatores, relés, and other electrical circuits. Push buttons with indicator lights can also be used for light signal indication scenarios.
The series complies with the GB/T 14048.5 padrão, with an IP rating of IP40, and some models with indicator lights can reach IP54.
- Model Naming Rules and Classification
Model Format
`NP4-□□□/□`
| Code Position | Significado | Example |
| 1st Digit | Number of Normally Open (NÃO) Contacts | 0 = None, 1 = 1 NÃO, 2 = 2 NÃO |
| 2nd Digit | Number of Normally Closed (NC) Contacts | 0 = None, 1 = 1 NC, 2 = 2 NC |
| 3rd Digit | Type Code | BN = Flat Button, GN = Raised Button, MD = Mushroom Head, XB = Rotary Handle, M = Emergency Stop |
| 4th Digit | Auxiliary Specification | ZS = Latching, D = With Indicator Light, /1 = 1 NÃO, /2 = 1 NC, /3 = 1 NÃO + 1 NC |
Core Classification
| Type | Representative Model | Recursos funcionais | Cenários de aplicação |
| Self-Resetting Push Button | NP4-11BN (Flat Button), NP4-11GN (Raised Button) | Conducts when pressed, resets when released | Jog control of equipment, temporary signal triggering |
| Latching Push Button | NP4-11BNZS (Flat Button Latching) | Locks in conduction state when pressed, resets when pressed again | Long-term operation control of equipment, mode switching |
| Push Button with Indicator Light | NP4-11DN (Raised Button with Light), NP4-01DN | Built-in LED light, integrates control and indication functions | Power status indication, fault alarm |
| Mushroom Head Push Button | NP4-01M/1 (Emergency Stop), NP4-11MD | Large-diameter mushroom head for clear and visible operation | Emergency shutdown, safety control |
| Selector Switch | NP4-10XB (2-Position Latching), NP4-20X/31 (3-Position Latching) | Multi-position switching with latching retention | Function mode selection, circuit conversion |
III. Key Technical Parameters
| Parameter Item | Specification Value | Remarks |
| Tensão operacional nominal | AC 380V, DC 220V | Control circuit voltage |
| Rated Operating Current | 10UM | Rated contact current |
| Vida Mecânica | Self-resetting type: 1,000,000 cycles; Latching type: 300,000 cycles; Selector type: 100,000 cycles | Complies with IEC 60947-5-1 |
| Vida Elétrica | 500,000 cycles | AC-15: 230V/2.5A, DC-13: 24V/0.5A |
| LED Light Parameters | Voltage: 6V/12V/24V/36V/110V/220V | Colors: Red, Green, Yellow, Blue, White |
| Mounting Dimension | 22milímetros (Panel Opening Diameter) | Compatible with standard industrial panels |
| Condições Ambientais | Temperatura: -5℃ ~ +40℃; Umidade: ≤90% (at 25℃) | Dust-free and non-corrosive gas environment |
- Core Functions and Characteristics
- Contact System: Adopts silver alloy contacts with excellent conductivity, low contact resistance, strong arc oxidation resistance, and long service life.
- Operating Mechanism: Self-resetting models are equipped with built-in springs for reliable resetting; latching models use a mechanical locking structure for precise positioning.
- Protection Design: The button head adopts a sealed structure, which effectively prevents dust and moisture from entering and ensures electrical safety.
- Easy Installation: Fixed on the panel via nuts, with adjustable mounting depth to adapt to panels of different thicknesses.
- Rich Color Options: Available in a variety of colors including red, verde, amarelo, azul, white, and black to meet different signal indication requirements.
- Typical Application Scenarios
| Industry Sector | Specific Applications | Recommended Models |
| Automação Industrial | Start-stop control of production line equipment, conveyor belt control | NP4-11BNZS (Latching), NP4-11DN (With Indicator Light) |
| Mechanical Equipment | Machine tool operation, hydraulic system control | NP4-01M/1 (Emergency Stop), NP4-10XB (Selector) |
| Building Electricals | Fan control, water pump start-stop | NP4-11BN (Self-resetting), NP4-11GN (Raised Button) |
| Security Systems | Emergency alarm, access control | NP4-01M/1 (Emergency Stop), NP4-11MD (Mushroom Head) |
| Instrument Control | Instrument parameter setting, mode switching | NP4-20X/31 (3-Position Selector) |
- Selection and Installation Guide
Selection Steps
- Determine Control Requirements: Self-resetting (temporary control) or latching (long-term control).
- Select Contact Configuration: 1NÃO (Normalmente aberto), 1NC (Normalmente fechado), or 1NO+1NC (Combination Contact).
- Consider Additional Functions: Whether indicator light or emergency stop function is required.
- Match Installation Environment: Panel thickness and IP rating requirements.
Installation Points
- The panel opening diameter shall be 22mm, and the edge of the opening must be smooth and burr-free.
- Durante a instalação, adjust the nut position first, then insert the button from the back of the panel and tighten the nut to fix it.
- Distinguish between the control circuit (AC/DC) and the indicator light circuit during wiring (pay attention to the LED voltage).
- Ensure that the wiring terminals are tightened to avoid poor contact caused by loosening and heating.
Vii. Common Model Quick Reference Table
| Modelo | Type | Contact Configuration | Function | Color |
| NP4-11BN | Flat Button | 1NO+1NC | Self-resetting | Black/White |
| NP4-11BNZS | Flat Button | 1NO+1NC | Latching | Red/Green |
| NP4-11DN | Raised Button with Light | 1NO+1NC | Self-resetting + Indication | Red (24V LED) |
| NP4-01M/1 | Emergency Stop | 1NÃO | Latching Emergency Stop | Red |
| NP4-10XB | Rotary Handle | 1NÃO | 2-Position Latching | Black |
| NP4-20X/31 | Selector Switch | 2NÃO | 3-Position Latching | Red/Green |
VIII. Manutenção e solução de problemas
- Inspeção Regular: Check the flexibility of button operation and whether there is contact ablation every quarter.
- Cleaning and Maintenance: Wipe the button surface with a dry cloth; avoid using corrosive cleaning agents.
- Solução de problemas:
– Button fails to reset: Check if the spring is damaged; replace the spring or the entire button assembly.
– Poor contact: Clean the contacts or replace the contact assembly.
– Indicator light not working: Check the LED lamp bead, power supply, and wiring; replace damaged components.
With the characteristics of high reliability, rich functions, and easy installation, the CHINT NP4 Series push buttons are widely used in various industrial control scenarios. For selection, comprehensive consideration should be given to specific control requirements, contact configurations, and additional functions to ensure the safety and stability of equipment control.
