What Is The Use Of Shunt Trip Coil In Mccb

In modern electrical systems, remote control and safety are essential. You may have heard of a shunt trip coil in an MCCB, but what exactly does it do? This article helps you understand how a shunt trip coil improves safety, automation, and control—key features for any professional power management setup.

Understanding Shunt Trip Coil in MCCB

A shunt trip coil (STC) is an optional accessory used in Molded Case Circuit Breakers (MCCBs). It enables remote tripping of the circuit breaker through an external signal. Essentially, it converts an electrical pulse—often triggered by a control system, fire alarm, or emergency stop button—into a mechanical action that opens the MCCB contacts and isolates the circuit.

This feature provides an additional layer of control and protection, allowing you to disconnect electrical systems instantly from a remote or automated command.

How Does a Shunt Trip Coil Work?

When an external voltage signal is applied to the shunt trip coil terminal, the coil generates a magnetic field that activates the tripping mechanism inside the MCCB.
Once energized, the MCCB instantly breaks the circuit, cutting off power to prevent damage or hazards.

Typical voltage ratings for shunt trip coils include AC 110V, 220V, and DC 24V, depending on your control system’s configuration. After activation, the MCCB must be manually reset to restore normal operation, ensuring the system is inspected before being re-energized.

Key Applications of Shunt Trip Coil in Electrical Systems

You can find shunt trip coils in a wide range of safety-critical and automated systems, including:

• Fire Safety Systems: Automatically disconnect power during fire alarms to prevent electrical fires.
• Industrial Equipment: Used for remote shutdown during emergencies or maintenance.
• Building Automation: Allows central control panels to trip breakers remotely.
• Data Centers: Enables immediate power cut-off to protect sensitive electronic systems.
• Unmanned Facilities: Ensures remote disconnection in case of abnormal operation or overloads.

By using a shunt trip coil, you can integrate MCCBs seamlessly into smart and automated protection systems.

Benefits of Using Shunt Trip Coil

Installing a shunt trip coil offers multiple advantages for modern electrical management:

• Enhanced Safety: Enables quick isolation during emergencies.
• Remote Operation: Allows control from distance, improving operational efficiency.
• Automation Integration: Works with sensors, alarms, and smart systems.
• Reduced Downtime: Prevents damage before faults escalate.
• Regulatory Compliance: Meets safety standards required in industrial and commercial facilities.

How to Choose the Right Shunt Trip Coil for Your MCCB

When selecting a shunt trip coil, consider these essential factors:

1. Voltage Compatibility: Match the coil voltage with your control circuit (AC/DC, 24–240V).
2. MCCB Model Compatibility: Confirm the accessory fits your specific MCCB model.
3. Operating Conditions: Check temperature, humidity, and environmental ratings.
4. Trigger Source: Define whether it will be connected to a fire alarm, PLC, or manual switch.

Choosing the right configuration ensures reliable tripping performance and system safety.

NUOMAK MCCBs: Smart Protection with Shunt Trip Coil Options

At NUOMAK, we provide MCCBs equipped with high-performance shunt trip coil options to meet industrial, commercial, and automation demands.
Our circuit breakers ensure accurate remote tripping, fast response, and long service life, supporting intelligent and secure power distribution systems. Whether for factories, smart buildings, or energy projects, NUOMAK MCCBs deliver dependable protection and flexibility.

Conclusion

A shunt trip coil in MCCBs gives you precise remote control and enhanced safety across industrial and commercial systems. By choosing MCCBs with built-in shunt trip options from NUOMAK, you ensure reliable, automated protection that fits your power management needs. NUOMAK helps you achieve smarter, safer electrical control.

FAQs

1. What is the function of a shunt trip coil in MCCB?
It allows the MCCB to trip remotely when an external voltage signal is applied, improving control and safety.

2. Where is a shunt trip coil used?
It’s commonly used in fire protection, industrial automation, and remote control systems.

3. Is a shunt trip coil mandatory in MCCBs?
No, it’s optional and used only when remote tripping or safety interlocks are required.

4. Can I install a shunt trip coil later?
Yes, most modular MCCBs allow easy installation of a shunt trip coil afterward.

5. Does NUOMAK provide MCCBs with shunt trip coil options?
Yes, NUOMAK offers MCCBs compatible with various shunt trip coil voltages for flexible and safe power control.