In residential and industrial electrical systems, circuit breakers are important switching and protection devices that help minimize risks arising from overloads, short circuits, leakage currents, or other abnormal electrical faults. Selecting the correct type of circuit breaker, rated current, and breaking capacity not only helps protect conductors and machinery but also contributes to improving the safety and stability of the entire electrical system.

HOANG NHAT Trading and Electrical Construction Joint Stock Company specializes in distributing and supplying CHINT circuit breakers, switching devices, and electrical equipment to residential customers, M&E contractors, electrical panel manufacturers, factories, and project customers in Hai Phong, Hanoi and the northern provinces.

In addition to supplying products, HOANG NHAT supports customers in selecting the appropriate MCB, MCCB, RCCB, RCBO, ACB, and related accessories based on the technical specifications and actual requirements of each system.

Introduction to the CHINT Brand

CHINT was established in 1984 and currently operates in the fields of green energy, smart electrical solutions, and low-carbon energy solutions. According to the Group’s official information, CHINT’s business network is currently present in more than 140 countries and territories, with more than 40,000 employees worldwide.

In the field of low-voltage electrical equipment, CHINT has developed a product ecosystem serving applications ranging from residential electrical circuits to large-scale industrial power distribution systems.

The brand’s switching equipment portfolio includes:

• MCB – miniature circuit breaker.
• MCCB – moulded case circuit breaker.
• RCCB – residual current circuit breaker.
• RCBO – residual current circuit breaker with overcurrent protection.
• ACB – air circuit breaker.
• Transfer switching devices.
• Contactors and relays.
• Motor protection devices.
• Measuring devices.
• Switching and control accessories.

Thanks to its broad product portfolio, CHINT can meet various levels of protection requirements in power distribution systems.

CHINT Circuit Breaker Product Lines Supplied by HOANG NHAT

1. CHINT MCB – Miniature Circuit Breaker for Overload and Short-Circuit Protection

MCB, short for Miniature Circuit Breaker, is a compact circuit breaker commonly installed on DIN rails inside electrical panels.

CHINT MCBs perform the following main functions:

• Switching electrical circuits on and off.
• Overload protection.
• Short-circuit protection.
• Circuit isolation during inspection or maintenance.

One of CHINT’s popular MCB product lines is NB1-63. According to the brand’s official documentation, the NB1-63 has rated currents of up to 63A, B, C, and D tripping characteristics, a breaking capacity of 6kA according to IEC/EN 60898-1, and configurations with different numbers of poles.

CHINT MCBs are suitable for use in:

• Lighting circuits.
• Electrical outlets.
• Air conditioners.
• Water pumps.
• Water heaters.
• Residential electrical panels.
• Branch distribution panels.
• Power supply circuits for small machinery.
• Commercial and light industrial electrical systems.

How to Read MCB Specifications

For example, an MCB marked C32:

• C: C-curve tripping characteristic.
• 32: Rated current of 32A.

The C curve is generally suitable for mixed loads or loads with moderate starting currents. For loads with high starting currents, the device characteristics should be carefully checked before selection.

2. CHINT MCCB – Moulded Case Circuit Breaker

MCCB, short for Moulded Case Circuit Breaker, is a moulded case circuit breaker commonly used in main electrical panels, distribution panels, or systems with higher load currents and higher breaking capacity requirements than MCBs.

One of CHINT’s representative MCCB product lines is NM8N.

The NM8N series is designed by CHINT for low-voltage AC and DC power distribution systems, with a wide current range from 16A to 1600A. Depending on the configuration, the device can use thermal, electronic, or magnetic protection units and can provide a breaking capacity of up to 150kA at 415V for certain versions.

CHINT MCCBs can perform functions such as:

• Overload protection.
• Short-circuit protection.
• System isolation.
• Undervoltage protection depending on configuration.
• Motor protection in certain versions.
• Earth fault or residual current protection for product lines equipped with the appropriate functions.

MCCBs are commonly used in:

• Main electrical panels.
• Distribution panels.
• Factories.
• Manufacturing workshops.
• Buildings.
• Shopping centers.
• HVAC systems.
• Power systems.
• Industrial machinery.
• Infrastructure projects.

When selecting an MCCB, customers should not rely only on the rated current but should also check the frame size, number of poles, voltage, Icu, Ics, trip unit type, and accompanying accessories.

3. CHINT RCCB – Residual Current Circuit Breaker

RCCB is a device specifically designed to detect residual current or current leaking outside the electrical circuit.

One popular CHINT product line is the NL1 RCCB.

The NL1 is designed for residual current protection and offers rated current options of up to 100A, 2P or 4P configurations, and various residual current sensitivity levels such as 30mA, 100mA, and 300mA depending on the version. The product complies with IEC/EN 61008-1.

RCCBs can be used for:

• Houses.
• Apartments.
• Offices.
• Water heaters.
• Electrical outlets.
• Wet areas.
• Workshops.
• Buildings.
• Systems requiring enhanced residual current protection.

Notes When Using RCCBs

An RCCB does not provide overload and short-circuit protection. Therefore, it normally needs to be coordinated with an appropriate MCB or MCCB to provide complete circuit protection.

This is an important point that customers need to pay particular attention to when selecting residual current protection devices.

4. CHINT RCBO – Residual Current Circuit Breaker with Overcurrent Protection

An RCBO combines residual current protection with overload and short-circuit protection in a single product.

CHINT’s NB1L series is one example. According to the manufacturer’s documentation, the NB1L provides protection against:

• Overload.
• Short circuit.
• Leakage current.

Depending on the model, the product has rated currents of up to 40A, multiple residual current sensitivity options, and a breaking capacity of 6kA in versions published by CHINT.

RCBOs are particularly suitable for electrical branches requiring independent protection, such as:

• Water heaters.
• Washing machines.
• Air conditioners.
• Water pumps.
• Electrical outlets in wet areas.
• Kitchen appliances.
• Outdoor equipment.
• Dedicated power supply circuits for machinery.

Using an RCBO integrates multiple protection functions into a single device, which can help save space inside electrical panels.

5. CHINT ACB – Air Circuit Breaker

For power distribution systems with high current ratings, CHINT provides Air Circuit Breaker – ACB product lines.

One representative product is the CHINT NA8.

The NA8 is developed for main low-voltage power distribution systems, with frame sizes from 1600A to 7500A, 3P or 4P configurations, and both fixed and draw-out versions. Depending on the configuration, the device controllers can provide overload, short-circuit, and earth fault protection, as well as monitoring and communication functions.

ACBs are commonly installed in:

• Main Switchboards – MSB.
• Transformer substations.
• Large factories.
• Shopping centers.
• High-rise buildings.
• Hospitals.
• Data centers.
• Industrial electrical systems.
• Infrastructure projects with large electrical loads.

ACB selection should be based on design documentation, operating current, expected short-circuit current, and the protection coordination strategy of the entire system.

Some Popular CHINT Circuit Breaker Product Lines

Depending on the market and the specific time, HOANG NHAT can support customers in checking CHINT product lines such as:

• NB1-63: MCB for overload and short-circuit protection.
• NB1-63H/2: MCB with higher breaking capacity in certain configurations.
• NB1L: RCBO for overload, short-circuit, and leakage current protection.
• NL1: RCCB for residual current protection.
• NB8-125: Compact switching device for applications up to 125A.
• NM8N: MCCB for power distribution systems.
• NA8: ACB for main power distribution systems.

Actual specifications depend on each product code. Customers should check the catalogue or provide the specific product code before placing an order.

Advantages of CHINT Circuit Breakers

Diverse Product Portfolio

CHINT provides devices ranging from MCBs for small electrical circuits to MCCBs and ACBs for high-capacity power distribution systems. As a result, customers can build a coordinated switching solution for multiple levels within the same electrical system.

Multiple Current Ratings and Breaking Capacities

CHINT circuit breaker product lines offer various options for:

• Rated current.
• Number of poles.
• Breaking capacity.
• Tripping characteristics.
• Residual current protection functions.
• Protection units.
• Installation methods.

This enables the devices to meet requirements ranging from residential electrical systems to industrial electrical panels.

Suitable for Various Types of Projects

CHINT circuit breakers can be used in:

• Houses.
• Apartments.
• Offices.
• Shops.
• Schools.
• Buildings.
• Factories.
• Industrial parks.
• Industrial electrical panels.
• Infrastructure projects.
• Energy systems.

Supporting Accessory System Available

Depending on the circuit breaker series, CHINT provides accessories such as:

• Auxiliary contacts.
• Alarm contacts.
• Shunt trip coils.
• Undervoltage release coils.
• Motor operators.
• External rotary handles.
• Interlocking mechanisms.
• Connection accessories.

Customers need to provide the exact circuit breaker model and frame size to check accessory compatibility.

How to Select the Appropriate CHINT Circuit Breaker

To select the correct device, customers need to determine the following important specifications:

1. Type of Circuit Breaker

The intended application should first be identified:

• MCB.
• MCCB.
• RCCB.
• RCBO.
• ACB.

2. Rated Current

The rated current of the circuit breaker must be suitable for the load current and the current-carrying capacity of the conductor.

A circuit breaker with a rated current that is too high compared with the conductor cross-section should not be selected, as this may reduce the protection provided to the conductor in the event of an overload.

3. Number of Poles

Depending on the electrical system, the following options may be selected:

• 1P.
• 1P+N.
• 2P.
• 3P.
• 4P.

The number of poles must be suitable for the configuration of the single-phase or three-phase electrical system.

4. Short-Circuit Breaking Capacity

Common symbols include:

• Icn.
• Icu.
• Ics.

The breaking capacity of the circuit breaker must be selected based on the expected short-circuit current at the installation location.

5. Residual Current Protection Function

If the system requires protection against leakage current, the following should be used:

• RCCB combined with an overcurrent protection device; or
• RCBO with integrated overcurrent and residual current protection.

A conventional MCB should not be confused with a residual current protection circuit breaker.

6. Load Characteristics

Motors, transformers, water pumps, and equipment with high starting currents require circuit breakers with suitable tripping characteristics to reduce unwanted CB tripping.

Benefits of Purchasing CHINT Circuit Breakers from HOANG NHAT Electrical Equipment

When purchasing CHINT equipment from HOANG NHAT, customers receive support with:

• Checking the correct product code.
• Distinguishing between MCB, MCCB, RCCB, RCBO, and ACB.
• Checking the rated current.
• Checking the number of poles.
• Checking the breaking capacity.
• Determining the required protection functions.
• Checking leakage current ratings for RCCBs and RCBOs.
• Checking MCCB and ACB protection units.
• Selecting compatible accessories.
• Providing catalogue and technical documentation support.
• Providing quotations based on quantity and specific requirements.
• Supplying coordinated equipment for electrical panels and projects.

HOANG NHAT serves residential customers, M&E contractors, electrical panel assemblers, factories, businesses, and project customers in Hai Phong, Hanoi and the northern provinces.

Information Required When Requesting a Quotation for CHINT Circuit Breakers

To make the checking and quotation process faster, customers should provide:

• Type of circuit breaker required.
• Product code, if available.
• Number of poles.
• Rated current.
• Operating voltage.
• Breaking capacity.
• Tripping characteristics.
• Residual current rating if leakage protection is required.
• Trip unit type for MCCB/ACB.
• Accessories to be installed.
• Quantity.
• Technical documentation requirements.
• Installation location and intended application.

For example, instead of simply requesting “CHINT 3-phase 100A CB”, customers should provide more specific information:

CHINT MCCB 3P – 100A, 400/415V operating voltage, breaking capacity as required by the design, with auxiliary contact if required.

The more complete the information provided, the more accurate the product code checking and quotation process will be.

HOANG NHAT – Complete Electrical Equipment Supply Solution

In addition to CHINT circuit breakers, HOANG NHAT Trading and Electrical Construction Joint Stock Company also supplies various groups of electrical equipment and materials for residential and industrial projects, such as:

• Contactors.
• Thermal relays.
• Motor protection devices.
• Control devices.
• Measuring devices.
• Electrical panels.
• Wires and electrical cables.
• Lighting equipment.
• Switches and sockets.
• Earthing and lightning protection materials.
• Cable trays and cable ladders.
• Connection accessories.
• Various types of electrical materials for construction projects.

With the orientation of supplying the correct product – with the correct specifications – suitable for each system, HOANG NHAT Trading and Electrical Construction Joint Stock Company is a distributor of CHINT circuit breakers and electrical equipment, serving customers in Hai Phong, Hanoi and the northern provinces.