CHINT Push Button NP2-11BN

CHINT Push Button NP2-11BN is a product of the NP2 series, suitable for industrial control circuits. Ниже приводится его подробное описание:

Особенности продукта

Structural Design: Adopts a metal head design with an IP40 protection rating, offering good dustproof performance. The screw fixing method is more secure than nut fixing, making it suitable for applications with vibration.

Contact Characteristics: Оснащен 1 Нормально открытый + 1 Нормально закрытый (1НО+1НЗ) contacts, with an initial contact resistance ≤ 50mΩ. The copper alloy contacts feature excellent electrical conductivity, high temperature resistance and oxidation resistance, ensuring stable electrical connections.

Принцип работы: Normally self-resetting. That is, the button automatically springs back to its original position when released after being pressed, which can prevent the system from staying in an abnormal state for a long time due to misoperation.

Appearance Design: Adopts a standard circular structure as a whole. The shell is made of engineering plastic, with a solid hand feel and easy installation, and is compatible with various standard panel hole diameters.

Технические параметры

Номинальное напряжение: Suitable for AC circuits with a frequency of 50Hz or 60Hz and a rated working voltage up to 380V, as well as DC circuits with a working voltage up to 220V.

Conventional Free Air Thermal Current: Ith = 10A.

Механическая жизнь: 1,000,000 operations for flat-head, mushroom-head and illuminated types.

Электрическая жизнь: 500,000 AC operations and 200,000 DC operations for flat-head and mushroom-head types.

Installation Dimensions: Mounting plate hole diameter is Φ22.3⁺⁰·⁴mm.

Информация о ценах: The market price varies according to purchase channels and quantities, with a reference price ranging from about 10 yuan to 20 yuan.

Installation Precautions for CHINT Push Button NP2-11BN

CHINT NP2-11BN is a 1NO+1NC self-resetting push button, suitable for industrial control circuits. Installation must comply with specifications to ensure stable equipment operation and personnel safety. The specific precautions are as follows:

Pre-installation Preparation
Model and Appearance Inspection

Confirm that the product model is NP2-11BN, consistent with the design and selection, to avoid contact function mismatch caused by model confusion.

Check that the button shell and contact terminals are intact without cracks, деформация, oxidation, rust or other defects; the self-resetting spring rebounds smoothly without jamming.

Tool and Auxiliary Material Preparation

Essential tools: Φ22.3mm special hole opener, electric hand drill, Phillips screwdriver, wire stripper, crimping tool;

Auxiliary materials: Cold-pressed terminals suitable for terminal wire diameters (необязательный), insulating tape, nameplates.

Power-off Confirmation

Перед установкой, cut off all power of the circuit where the button is located, and hang a “No Switching On” sign to prevent electric shock.

Panel Hole Drilling Requirements
Hole Diameter and Thickness Specifications

The hole diameter is Φ22.3⁺⁰·⁴mm. An oversized hole will cause the button to loosen and reduce the protection rating; an undersized hole will squeeze the shell and cause deformation, affecting the reset function.

Suitable for panel thickness of 1~5mm. If the panel thickness exceeds 5mm, additional counterbore processing is required, otherwise the fixing nut cannot be tightened.

Hole Position Requirements

The button installation position should avoid equipment vibration sources (such as motors and pumps) to prevent loose wiring or button failure caused by long-term vibration;

Reserve sufficient space (≥30mm) on the back of the panel to facilitate wiring and terminal heat dissipation, and avoid interference with other components.

III. Wiring Operation Specifications

Contact Function Distinction

The terminals of NP2-11BN are clearly marked. It is necessary to strictly distinguish between Normally Open (НЕТ) and Normally Closed (Северная Каролина) contacts to avoid control logic errors caused by incorrect wiring:

Нормально открытый (НЕТ) contact: Closes when the button is pressed and opens when released.

Нормально закрытый (Северная Каролина) contact: Opens when the button is pressed and closes when released.

Wire and Terminal Requirements

Suitable for wire cross-sectional area of 0.5~2.5mm². An oversized wire cannot be inserted into the terminal, while an undersized wire is prone to heating and ablation;

Control the wire stripping length to 5~8mm, and avoid damaging the wire core during stripping; it is recommended to use cold-pressed terminals for crimping before inserting into the wiring terminals to enhance conductivity and vibration resistance.

Wiring Tightening Requirements

Tighten the terminal screws with a Phillips screwdriver, with a torque controlled at 0.8~1.2N·m. Loose screws will lead to poor contact and heating, while over-tightening will damage the terminal threads;

После подключения, gently pull the wires to confirm that there is no looseness; bundle the excess wires to avoid contact with other live parts.

Fixing and Commissioning
Installation and Fixing Steps

Insert the button body into the hole from the front of the panel to ensure that the button is perpendicular to the panel without skew;

Screw the fixing nut into place from the back of the panel, tighten it by hand and then use a wrench to turn it half a circle. Over-tightening is strictly prohibited to prevent cracking of the plastic shell.

Power-on Commissioning Inspection

Before commissioning, reconfirm that the wiring is correct and remove tools and debris from the back of the panel;

After switching on the power, press the button to test the contact on-off status: observe whether the associated equipment (such as contactors and indicator lights) operates in accordance with the control logic, and check whether the button can quickly self-reset without jamming or delay when released.

Environmental and Maintenance Precautions
Environmental Adaptation Requirements

The button has an IP40 protection rating and is only suitable for indoor environments that are dry, dust-free and free of corrosive gases; if installed in a dusty environment, a matching dust cover must be added.

Avoid installation in high-temperature (＞55℃) or low-temperature (＜-25℃) environments to prevent aging or embrittlement of plastic components.

Daily Maintenance Points

Regularly check whether the fixing nuts and wiring terminals are loose, especially in vibration environments where inspection should be carried out monthly;

When cleaning the button surface, cut off the power supply and wipe it with a dry soft cloth. Flushing with water or organic solvents is strictly prohibited.