Chint Push Button NP2-BA31

The Chint Push Button NP2-BA31 is a self-resetting momentary switch specifically designed for industrial control applications. It is suitable for circuit control scenarios that require instantaneous triggering.

I. Core Parameters and Functions

1. Electrical Performance

- Rated Voltage/Current: Suitable for AC circuits with 50/60Hz frequency and voltage of 250VAC or below. The contact capacity is 10A (in line with the overall specifications of the NP2 series). It should be noted that the 5A rating marked by some channels may be a parameter under specific test conditions; the official 10A rating shall prevail in actual use.

- Contact Configuration: 1 set of Normally Open (NO) contacts. The circuit is activated when the button is pressed and deactivated when released, making it suitable for momentary control such as motor debugging and equipment startup.

2. Mechanical Properties and Protection

- Mechanical Life: Over 100,000 press operations. It adopts a high-elasticity phosphor bronze spring and silver alloy contacts to ensure long-term stability.

- Protection Level: The standard model has an IP40 rating (dust-proof). If IP65 rating (waterproof and dust-proof) is required, a customized version is needed (with suffix "C" in the model number). The IP65 rating mentioned in user feedback may refer to a customized version or result from channel confusion; the specific model shall prevail.

3. Physical Specifications

- Installation Dimensions: Standard 22mm mounting hole, with panel snap-on fixation, compatible with common control cabinet panels.

- Color: Default green (indicated by the BA31 model). Other colors such as red and yellow correspond to different functions (e.g., BA42 is for normally closed function).

II. Application Scenarios and Precautions

1. Recommended Applications

- Industrial Equipment: Momentary control requiring short-term power supply, such as punch presses and test benches.

- Teaching and Training: Used in basic circuit connection teaching for electrical training, featuring a simple structure that minimizes misoperation.

- DIY Projects: Suitable for manual triggering scenarios of low-power equipment, such as small mechanical control.

2. Usage Limitations

- Load Limitation: Direct control of high-current loads (e.g., over 5A) is not recommended; a relay should be used for intermediary control.

- Frequency Limitation: Not suitable for high-frequency continuous operations; it is recommended to use a contactor for automated control.

- Environmental Requirements: The IP40 model should not be used in humid or dusty environments. For outdoor applications, a customized IP65 version is required.

III. Installation and Maintenance

1. Installation Steps

- Hole Drilling: Drill a 22mm hole on the panel and ensure the edge is smooth.

- Fixation: Insert the button from the front of the panel, then tighten the base nut from the rear. Control the torque within 0.8-1.0N·m to avoid jamming due to over-tightening.

- Wiring: Only need to connect the Normally Open (NO) contacts. The cross-sectional area of the wire should be 0.5-2.5mm², and wire ends must be crimped with terminals to ensure reliable contact.

2. Maintenance Recommendations

- Regular Inspection: Tighten the terminal blocks and fixing screws monthly to prevent loosening.

- Cleaning and Maintenance: Wipe the surface with a dry cloth to prevent foreign objects from entering the contact gap. If necessary, use electrical cleaner to remove oxide layers.

IV. Certifications and Reliability

1. Compliance Certifications

- Has obtained domestic and international certifications such as CCC, CE, and UL, complying with GB/T 14048.5 and IEC 60947-5-1 standards, and is applicable in most regions around the world.

- The silver alloy contacts and silver-plating process enhance electrical conductivity, reduce contact resistance, and make it suitable for low-voltage and low-current scenarios.

2. User Feedback

- Advantages: Industrial users have tested over 300 units in bulk, with an annual repair rate of less than 1.7%. The spring has a crisp rebound, and the contacts have a long service life.

- Points to Note: There is model confusion on some e-commerce platforms (e.g., mislabeling BA31 as the normally closed BA21 type). It is necessary to confirm the model suffix when purchasing.

V. Procurement and Price Reference

1. Price Range

- The price per unit is approximately 5-12 RMB. For bulk purchases (e.g., 10 units/box), the unit price can be reduced to 5-8 RMB.

- The price of customized versions (e.g., English version, IP65 protection) increases by 20%-30%, with a lead time of about 2 weeks.

2. Purchasing Channels

- Official Channels: Chint Electric Mall and authorized distributors provide technical support and genuine product guarantees.

- Official Channel: Chint Authentic Product Guarantee WhatsApp: 0086-13811255435.

VI. Model Comparison and Selection

Selection Suggestion: Select the model based on the control logic (normally open/normally closed), environmental requirements (protection level), and number of contacts. Avoid confusing similar models.

Summary

With its high reliability, ease of use, and cost-effectiveness, the NP2-BA31 has become a classic choice in the field of industrial control. Users should pay attention to model verification, load matching, and compliance with installation specifications when purchasing and using the product to fully leverage its performance advantages. For special environmental requirements, customized versions can be used to meet higher protection needs.