MUTAI MCB:Reliable Circuit Protection for Modern Electrical Systems

Electrical safety is one of the most important foundations of any power distribution system. Whether in residential buildings, commercial facilities, or industrial environments, protecting circuits from overloads and short circuits is essential for ensuring safe and stable operation. To meet these needs, Mutai Electric Group provides reliable and efficient MCB (Miniature Circuit Breaker) solutions.

What Is an MCB?

An MCB (Miniature Circuit Breaker) is an automatic electrical protection device designed to protect circuits from damage caused by overcurrent, overload, and short circuit faults.

Unlike traditional fuses, an MCB can automatically trip during abnormal conditions and can be reset after the fault is cleared, making it safer, more convenient, and more cost-effective for long-term use.

What Is the Function of an MCB?

The primary role of an MCB is to interrupt the circuit when excessive current flows through the electrical system.

Its protection functions include:

• Overload Protection
  Prevents overheating caused by excessive current over a period of time.
• Short Circuit Protection
  Quickly disconnects the circuit during sudden fault currents to protect wiring and equipment.
• Switching Function
  Can also be used for infrequent manual switching and circuit isolation.

By rapidly cutting off abnormal current, MCBs help reduce the risk of electrical fires, equipment damage, and system failures.

Applications of MCBs

MCBs are widely used in:

• Residential distribution boards
• Commercial buildings
• Industrial electrical panels
• Lighting systems
• Socket outlet circuits
• Small machinery and equipment

Their compact size and reliable performance make them one of the most commonly used protective devices in low-voltage electrical systems.

Mutai CMTB1-63 Series MCB

Mutai Electric Group’s CMTB1-63 Series Miniature Circuit Breaker is designed for dependable circuit protection in AC power systems.

The product is mainly used in AC 50Hz circuits, with:

• Rated working voltage: up to 400V
• Rated current: 3A–63A
• Rated short-circuit breaking capacity: up to 6000A

The CMTB1-63 series complies with:

• IEC 60898-1
• GB/T 10963.1

ensuring reliable safety and performance standards for household and similar applications.

Key Product Features

Multiple Pole Options

Available in:

• Single Pole
• Double Pole
• Triple Pole
• Four Pole

to meet different installation requirements.

Wide Current Range

Rated current options include:

3A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A.

Trip Curve Options

Mutai MCBs are available with:

• C Curve — suitable for general distribution protection
• D Curve — suitable for motor protection and higher inrush current applications

Reliable Breaking Capacity

• Up to 6000A breaking capacity for 3A–40A models
• Up to 4500A breaking capacity for 40A–63A models

providing stable protection against fault currents.

Designed for Stable and Safe Operation

Mutai’s MCB products are developed with strict quality standards and tested for stable operation under different electrical conditions. The products offer:

• Reliable tripping performance
• Fast short-circuit protection
• Compact structure
• Long service life
• Easy installation

Focus on Your Value

As a professional low-voltage electrical manufacturer, Mutai Electric Group continues to provide safe, efficient, and dependable circuit protection solutions for customers worldwide.

The CMTB1-63 Series MCB reflects our commitment to product quality, safety, and continuous innovation — helping build safer and more reliable electrical systems for modern applications.