Shunt Trip AC Molded Case Circuit Breaker

What Is a Shunt Trip AC MCCB?

A Shunt Trip AC Molded Case Circuit Breaker is an advanced molded case circuit breaker equipped with a shunt release accessory. While a standard breaker protects against overloads and short circuits, the shunt trip feature allows the breaker to be tripped electronically from a remote location, such as an emergency stop button or a fire alarm system.

Technical Core of Our 125A Series

• Remote Triggering: Enables immediate disconnection of the power supply via external signal.
• Adjustable Trip Unit: Features thermal protection (0.8–1x In) and magnetic protection (5–10x In) for precise circuit tuning.
• Robust Durability: Engineered for an electrical life of up to 4,000 operations and a mechanical life of 15,000 cycles.

Key Applications and Usage Scenarios

The Shunt Trip AC MCCB is an essential safety component for industrial and commercial power systems that require more than just standard overcurrent protection. By allowing for remote electronic triggering, it bridges the gap between manual circuit control and fully automated safety protocols.

1. Industrial Emergency Stop (E-Stop) Integration

In manufacturing environments, the Shunt Trip AC Molded Case Circuit Breaker is frequently linked to emergency stop buttons located around heavy machinery. This ensures that in the event of a mechanical failure or safety hazard, operators can instantly kill the power to 75kW–90kW motors or conveyor systems from a distance.

2. Fire Safety and Building Automation

Modern building codes often require the ability to disconnect non-critical power during a fire. As a specialized China supplier, we provide breakers that integrate directly with fire alarm control panels. When a fire is detected, the alarm sends a signal to the shunt release, causing the breaker to trip and prevent electrical fires from spreading.

3. Remote Power Management in Distribution Networks

For large-scale power distribution, the Shunt Trip AC Molded Case Circuit Breaker is used within HV/LV switchgears and box transformers. It enables facility managers to perform load shedding or isolate specific branches of a grid via a centralized PLC (Programmable Logic Controller) without needing to manually access the electrical room.

4. Protection for Specialized Heavy Equipment

Our breakers are highly recommended for the following equipment categories:

• Hydraulic Stations: Immediate isolation during pressure failures.
• Water Pumps & Compressors: Coordinated shutdown to prevent equipment damage during system errors.
• Medium-sized Production Lines: Synchronized power-off for complex, interconnected machinery.

5. Marine and Offshore Remote Isolation

In the demanding environments of marine engineering, the Shunt Trip AC MCCB provides a reliable way to manage power in hard-to-reach areas, ensuring that main circuits can be safely disconnected from the bridge or a central control cabin.

Key Features and Capabilities

Our Shunt Trip AC Molded Case Circuit Breaker is built to meet international IEC and ISO standards, ensuring "Quality Winning" performance:

• High Breaking Capacity: Effectively isolates faults up to 50kA, protecting your downstream assets from catastrophic damage.
• 3-Pole Linked Operation: Ensures complete isolation of three-phase systems for maintenance and safety.
• Advanced Arc Quenching: Utilizes a grid system to rapidly extinguish arcs, significantly extending the breaker's service life.
• Versatile Configurations: We offer full OEM/ODM services to customize logos and technical parameters to your specific drawings.

Why Partner with PUGAO?

Based in Liushi, the "Electrical Capital of China," PUGAO Technology Co., Ltd. combines a scientific quality management system with a mature industrial cluster.

• Certified Excellence: ISO9001, ISO14001, and ISO45001 certified manufacturer.
• Industry Recognition: Trusted by over 20 global dealers for our technical strength and "integrity management" philosophy.
• Efficiency: Fast delivery (10-15 working days) and professional technical support within 48 hours.

FAQ

What is an MCCB's purpose?

The Shunt Trip AC Molded Case Circuit Breaker serves two roles: it automatically protects against electrical faults and allows for intentional, remote disconnection of the circuit for safety or operational needs.

What does "Molded Case" mean?

It refers to the high-strength, insulated housing that protects the internal mechanisms. This "Molded Case" provides superior electrical insulation and durability against harsh industrial dust and vibration.

How often should maintenance be performed?

We recommend a visual inspection every six months. For breakers with a shunt trip accessory, the remote trip function should be tested annually to ensure the electrical signal successfully triggers the mechanism.

What are trip settings?

Trip settings are adjustable thresholds that determine when the breaker reacts to overcurrent. These settings allow the Shunt Trip AC MCCB to be tailored to specific loads, such as high-impact starting motors.