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EXM3 AC MCCB

The EXM3 AC MCCB is engineered for superior performance in electrical protection applications. Compliant with IEC 60947-2 and GB/T 14048.2 standards, it supports rated insulation voltages up to 1000V and current ratings from 10A to 1250A. Available in three performance levels—Basic (C), Standard (S), and High Breaking Capacity (H)—the EXM3 MCCB is designed to distribute power and safeguard electrical systems from overloads, short circuits, and undervoltage faults. Its compact size, high breaking capacity, short arcing distance, and optional accessories make it ideal for both industrial and commercial power distribution.

  • ✅ Wide Current Range

  • ✅ High Breaking Capacity Options

  • ✅ Dual Trip Unit Options

  • ✅ Modular Design with Rich Accessories

  • ✅ Flexible Mounting and Wiring Methods

  • ✅ Robust Build and Long Lifespan

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Product Description

EXM3 AC MCCB Wide Current Range & Flexible Configuration

Wide Current Range & Flexible Configuration

Offers frame currents from 125A to 630A with adjustable rated currents from 10A to 630A, suitable for diverse industrial and commercial applications.

High Breaking Capacity Options

Available in C (25kA), S (36kA), and H (50kA) types to meet various fault current levels, ensuring reliable protection in demanding environments.

EXM3 AC MCCB High Breaking Capacity Options
EXM3 AC MCCB Dual Trip Unit Options

Dual Trip Unit Options

Supports both thermal-magnetic and electronic trip units, offering standard and intelligent protection modes for precise load control and fault diagnosis.

Modular Design with Rich Accessories

Compatible with auxiliary contact, alarm contact, shunt trip, undervoltage release, and motorized operation—enhancing adaptability for different scenarios.

EXM3 AC MCCB Modular Design with Rich Accessories
EXM3 AC MCCB Flexible Mounting and Wiring Methods

Flexible Mounting and Wiring Methods

Available in fixed, plug-in, and withdrawable types with front and rear connection options for easy integration into new or existing systems.

Robust Build and Long Lifespan

Designed for durability with up to 10,000 mechanical operations and over 2,000 electrical operations, ideal for long-term use in harsh industrial environments.

EXM3 AC MCCB Robust Build and Long Lifespan

Applications

The EXM3 MCCB is widely used in low-voltage power distribution systems across industrial, commercial, and infrastructure sectors. Its high breaking capacity and broad current range make it ideal for protecting circuits and equipment from overloads, short circuits, and undervoltage conditions. Common applications include main distribution boards, motor control centers, subpanels in factories, data centers, public buildings, and transportation hubs. It is also suitable for power distribution in renewable energy systems, such as photovoltaic and wind power stations, where stable and reliable protection is critical.

Product Specs

Item EXM3 AC MCCB
Standard IEC 60947-2 / GB/T 14048.2
Frame Current (Inm) 63A, 125A, 250A, 400A, 630A, 800A, 1000A, 1250A
Rated Operational Voltage (Ue) AC400V / AC690V
Rated Insulation Voltage (Ui) AC800V/1000V
Rated Impulse Withstand Voltage (Uimp) 8kV
Rated Frequency 50/60Hz
Rated Current (In) 10A–1250A (depending on frame size)
Number of Poles 1P / 2P / 3P / 4P
Breaking Capacity Different frames have different breaking capacities, please inquire for details
Trip Unit Type Thermal-Magnetic / Electronic (for higher frames)
Protection Features Overload, Short Circuit, Phase Loss, Earth Fault (Electronic version)
Installation Type Fixed / Plug-in / Withdrawable (for 400A and above)
Connection Method Front / Rear Terminal Connection
Mechanical Life ≥10,000 operations
Electrical Life ≥2,000 operations
Ambient Temperature -25℃ to +70℃
Altitude ≤ 2000m
Pollution Degree Class 3
Accessories (Optional) Auxiliary Contact, Alarm Contact, UV Release, Shunt Trip, Motor Operator
Mounting Method Vertical (standard), Horizontal (customized)

Product Content

🔹 How to Choose the Right EXM3 AC MCCB

1. Frame Size & Rated Current

  • Frame sizes available: 125A, 250A, 400A, 630A, 800A, 1000A, 1250A

  • Rated current (In) ranges from 10A to 1250A

  • Choose the frame size based on your system load and cabinet size

2. Breaking Capacity

  • Type C: Basic class, suitable for standard circuits

  • Type S: Standard class, suitable for industrial environments

  • Type H: High class, ideal for high fault-level installations

3. Pole Configuration

  • 3P: Three-phase systems

  • 4P: For applications requiring neutral line protection

4. Tripping Unit Type

  • Thermal-Magnetic Release: General distribution protection

  • Electronic Release: Suitable for precise load protection and motor applications

  • Dual Protection: For combined load and motor circuit needs

5. Connection Type

  • Front connection (standard)

  • Rear connection, plug-in type, or withdrawable unit (optional for 250A and above)

6. Accessories & Protection Options

  • Auxiliary contact, alarm contact

  • Shunt release, undervoltage release

  • Select these based on control and monitoring requirements


🔹 How to Purchase the EXM3 AC MCCB

When placing an order, please specify the following:

① Product Model Format
EXM3 – [Frame Size] – [Breaking Type] – [Pole Number] – [Tripping Unit] – [Mounting Type]

Example:
EXM3-250H/3P/TM/Front
Explanation: 250A frame, high breaking type, 3 poles, thermal-magnetic trip unit, front connection.

② Required Accessories
List clearly any of the following:

  • Auxiliary contact

  • Shunt release (specify control voltage, e.g. AC220V or DC24V)

  • Undervoltage release

  • Alarm contact

③ Application Type

  • Distribution system: leave application code blank

  • Motor protection: add application code “2” (e.g., EXM3-250S-2)

④ OEM/Customization (Optional)

  • Company logo printing

  • Custom packaging

  • Bulk project kits

⑤ Quantity and Delivery

  • State total quantity required

  • Indicate preferred delivery schedule

Contact HUYU Electric’s authorized sales team or distributor network for pricing, lead time, and datasheet support.

FAQs

1. What frame sizes are available for the EXM3 AC MCCB?
Answer:

The EXM3 AC MCCB series is available in frame sizes of 125A, 250A, 400A, and 630A, with rated current ranging from 10A to 630A.

2. How do I choose between thermal-magnetic and electronic trip units?
Answer:

Thermal-magnetic units are ideal for general-purpose protection, while electronic trip units provide more precise control and are recommended for motor protection or critical loads.

3. What are the different breaking capacity levels, and how do I choose the right one?
Answer:

EXM3 AC MCCB offers three breaking levels:

  • C-type (Basic) for general circuits

  • S-type (Standard) for industrial applications

  • H-type (High) for high fault current environments
    Select based on your system’s short-circuit capacity.

4. Can EXM3 AC MCCB be used for both power distribution and motor protection?
Answer:

Yes. Standard units cover distribution needs, and special “motor protection” versions are available upon request, with customized tripping characteristics.

5. What optional accessories are available?
Answer:

You can equip the EXM3 AC MCCB with auxiliary contacts, shunt releases, undervoltage releases, and alarm contacts. For shunt and undervoltage releases, please specify the control voltage (e.g., AC220V, DC24V).

6. Are plug-in or withdrawable versions available?
Answer:

Yes, plug-in and withdrawable designs are available for 250A and above. These options make installation and maintenance easier in modular panels.

7. Can I customize the product with our company logo or color?
Answer:

Yes, OEM customization including logo printing, packaging, and labeling is supported for bulk orders. Please contact our sales team for details.

8. Is this EXM3 AC MCCB compliant with international standards?
Answer:

Yes, the EXM3 AC MCCB series is manufactured in accordance with IEC 60947-2 and GB/T 14048.2, ensuring global standard compliance.

9. What is the recommended installation method about EXM3 AC MCCB?
Answer:

The standard installation is vertical with front connection. Rear connection or other mounting methods can be customized based on your panel design.

10. What support do you offer after purchase?
Answer:

We provide full technical documentation, installation guidance, and after-sales support. For any issues, please contact HUYU’s service team or your local distributor.

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