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Circuit breakers are key protection devices used to automatically cut off faulty circuits in electrical systems.

As a leading electrical circuit breaker supplier, we source from top industrial circuit breaker manufacturers to provide these essential components. Their core functions include overload protection, short-circuit protection, and electrical isolation.

Circuit breakers are classified by application into Miniature (MCB), Molded Case (MCCB), Air (ACB), Vacuum (VCB), and Residual Current (RCCB/RCBO) types.
They operate via thermal (overload) and magnetic (short-circuit) tripping mechanisms for fast disconnection.

In motor control systems, breakers serve as main protection switches, working alongside contactors (for remote control) and thermal relays (for overload protection).

Selection should consider rated current, breaking capacity, pole count, and tripping curve (e.g., type C for standard motor protection) to match load and system needs accurately.

Overview

Applications

Selecting

Brands

Main Components of the Circuit Breaker System

Discover how circuit breakers isolate faults and protect electrical systems

Din Rail Breaker

Poles: 1P, 2P, 3P, 4P
Rated Current (In): 6A - 125A
Breaking Capacity (Icn): 4.5kA - 25kA (per IEC/EN 60898)
Rated Voltage (Ue): 230V-400V AC (single/three-phase) | 24V-60V DC
Tripping Characteristic: Type C (general loads), Type D (high inrush loads), Type K (motor-specific)
Terminal Type: Screw clamp terminals / Spring-loaded terminals

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Molded Case Circuit Breakers

Poles: 3P, 4P
Rated Current (In): 100A - 6300A
Breaking Capacity (Icu/Ics): 25kA - 200kA (IEC 60947-2)
Rated Voltage (Ue): 400V-690V AC (50/60Hz) | 250V-1000V DC
Tripping Characteristic: Thermal-Magnetic (Fixed) / Adjustable Electronic (LSI Protection)
Terminal Type: Front/Rear Cable Entry, Lug Terminals

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Motor Protection Circuit Breakers

Poles: 3P, 4P
Rated Current (In): 0.4A - 630A
Breaking Capacity (Icu/Ics): 10kA - 150kA (IEC 60947-2)
Rated Voltage (Ue): 400V-690V AC (50/60Hz) | 24V-250V DC
Protection Functions: Overload, Short-Circuit, Phase Loss, Phase Imbalance, Locked Rotor Protection
Tripping Adjustment: Thermal-Magnetic/Electronic
Control Voltage: 24V-240V AC/DC (Optional for Shunt Release/Undervoltage Release)
Terminal Type: Spring Clamp/Screw Terminal

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Air Breaker

Poles: 3P, 4P
Rated Current (In): 800A - 6300A
Breaking Capacity (Icu/Ics): 50kA - 200kA
Rated Voltage (Ue): 400V-690V AC (50/60Hz) | 250V-1500V DC
Protection Functions: Overload, Short-Circuit, Ground Fault, Arc Flash Detection
Tripping Unit: Microprocessor-Based (Adjustable L, S, G, I<sup>2</sup>t, Zone Selectivity)
Control Voltage: 24V-48V DC / 110V-440V AC (Integrated for Shunt/Undervoltage Release)
Terminal Type: Horizontal/Vertical Busbar Connection

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DC Breaker

Poles: 1P (single pole), 2P (double pole)
Rated Current (In): 16A - 4000A
Rated Voltage (Ue): 60V-1500V DC (supports high voltage models of photovoltaic systems)
Breaking Capacity (Icu): 10kA-50kA (when voltage ≤500V DC) | 5kA-20kA (when voltage >500V DC)
Arc Extinguishing: Magnetic blow-out arc extinguishing design | Vacuum arc extinguishing
Tripping Characteristic: Fixed thermal magnetic tripping | Adjustable electronic tripping
Polarity Configuration: Single polarity/Bipolarity
Terminal Type: Screw terminal/Plug-in modular terminal

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Smart Breaker

Number of poles (Poles): 1P, 2P, 3P, 4P
Rated current (In): 6A - 630A
Breaking capacity (Icu): 10kA - 100kA (supports AC/DC mixed breaking)
Rated voltage (Ue): 120V-400V AC (single/three-phase) | 48V-1000V DC
Communication protocol: Wi-Fi, Bluetooth, Zigbee, LoRaWAN, Modbus TCP, EtherCAT
Monitoring function: Real-time current/voltage/power monitoring, temperature sensing, energy metering (kWh, PF, THD)
Protection function: Overload, short circuit, leakage (30mA-3A adjustable), arc fault (AFCI), overvoltage/undervoltage, phase imbalance
Control mode: Local manual operation, APP remote control, automated scene linkage (IFTTT), API integration
Data recording: Event log (up to 1000), energy consumption history (statistics by day/month/year), fault waveform capture
Terminals: Spring clamp terminals/screw terminals

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What is a Circuit Breaker?

A circuit breaker is an automatic switch that automatically cuts off a circuit when the current is too high to prevent damage to electrical equipment or fire. It can be reset and does not need to be replaced like a fuse.

Main function: overload or short circuit protection.
Common types: MCB (miniature circuit breaker), MCCB (molded case circuit breaker), GFCI (leakage protection), AFCI (arc protection).

Din Rail Breaker

DIN rail circuit breakers are circuit breakers installed on DIN rails, commonly used in distribution boxes, with compact structure and easy installation. They are mostly used for electrical protection in homes and industries.

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Molded Case Circuit Breakers

As a premier mccb supplier, we offer robust molded case circuit breakers for industrial power distribution. Designed for high-power equipment and main circuit protection, their insulated shells prevent electric shock and arc flash. We fulfill wholesale mccb orders directly from top-tier manufacturers.

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Motor Protection Circuit Breakers

Motor protection circuit breakers are specially designed for motors to prevent overload, short circuit and phase loss. They are often used in control cabinets to directly protect motors.

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Air Breaker

As your specialized air circuit breaker supplier, we provide solutions for high-current applications like main distribution switches.
Sourced from leading air circuit breaker manufacturers, these units use air as an arc extinguishing medium, ensuring reliable protection for industrial equipment and busbar systems.

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DC Breaker

Secure your DC circuits in solar, EV charging, or energy storage systems.
We partner with expert dc circuit breaker manufacturers to deliver solutions specifically engineered to interrupt DC current safely. For advanced needs, we offer wholesale dc smart mccb options with integrated control.

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Smart Breaker

Circuit breakers with remote control, monitoring, power management and other functions. Commonly used in intelligent power distribution systems, which can control and monitor power consumption in real time through mobile phones or systems.

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Din Rail Breaker

DIN rail circuit breakers are circuit breakers installed on DIN rails, commonly used in distribution boxes, with compact structure and easy installation. They are mostly used for electrical protection in homes and industries.

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Molded Case Circuit Breakers

Molded case circuit breakers are used for medium and high current protection (such as industrial power distribution). The shell is made of insulating material to prevent electric shock and arc flash. It is suitable for high-power equipment and main power protection.

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Motor Protection Circuit Breakers

Motor protection circuit breakers are specially designed for motors to prevent overload, short circuit and phase loss. They are often used in control cabinets to directly protect motors.

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Air Breaker

Air circuit breakers are used in high current situations (such as main switches in distribution rooms), and the arc extinguishing medium is air. They are suitable for high-power industrial equipment and busbar system protection.

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DC Breaker

DC circuit breakers are used in DC circuits (such as solar systems, electric vehicles). They are designed differently from AC circuit breakers and are specifically designed to cut off DC current.

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Smart Breaker

Circuit breakers with remote control, monitoring, power management and other functions. Commonly used in intelligent power distribution systems, which can control and monitor power consumption in real time through mobile phones or systems.

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TM241CE40R Logic Controller Modicon M241 40 IO Relay

Where Are Circuit Breakers Used?

Circuit breakers protect electrical circuits from overcurrent, overloads, and short circuits. They are vital in:

Residential Settings: Safeguarding home lighting, appliances, and outlets in electrical panels.
Commercial Environments: Protecting HVAC, lighting, and equipment in offices and stores.
Industrial Applications: Securing machinery, motors, and heavy equipment in factories. Sourcing from the right electrical circuit breaker manufacturers is critical for industrial safety.

Specialized Systems: Used in solar panels, data centers, and transportation infrastructure.

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TM241CE40R Logic Controller Modicon M241 40 IO Relay

Who Uses Circuit Breakers?

Various individuals rely on circuit breakers:

Electricians: Install and maintain breakers in homes and businesses.
Engineers: Design systems and select breakers for projects.
Facility Managers: Ensure safety in commercial/industrial buildings.
Homeowners: Reset or replace breakers during upgrades.

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Comprehensive Circuit Breaker Selection Guide

A concise guide to help you choose the right circuit breaker based on voltage, current ratings, pole types, breaking capacity, and safety features for residential, commercial, or industrial needs.

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What is the voltage and current rating required for your electrical system?

The voltage and current rating must match your electrical system:

Voltage:
Residential systems typically use 120V or 240V (North America) or 230V (Europe).
Commercial or industrial systems may require higher voltages, like 480V or more.
Current Rating: This is the maximum continuous current the breaker can handle without tripping. Examples include:
15A or 20A for home lighting and outlets.
30A to 50A for larger appliances (e.g., ovens, dryers).
100A or higher for industrial equipment.
Check your system’s specifications or consult an electrician to determine the exact voltage and current your circuit requires.

Do you need a single-pole, double-pole, or multi-pole circuit breaker?

The number of poles depends on the circuit type:

Single-pole: Protects one hot wire, typically for 120V circuits (e.g., lighting or outlets in homes).
Double-pole: Protects two hot wires, used for 240V circuits (e.g., water heaters, dryers).
Multi-pole (three or four poles): Used in three-phase systems, common in industrial or large commercial settings.
For example, if you’re protecting a 120V bedroom outlet, a single-pole breaker is enough. For a 240V appliance or a three-phase motor, you’d need a double-pole or multi-pole breaker, respectively.

What breaking capacity do you need?

Breaking capacity (or interrupting capacity) is the maximum fault current the breaker can safely stop without failing. It must exceed the potential short-circuit current in your system:

Residential: 6kA to 10kA is usually sufficient.
Industrial/Commercial: 25kA or higher may be needed, depending on the system’s fault current.
To determine this, assess your system’s short-circuit risk (e.g., via an electrician’s fault current calculation). A breaker with too low a breaking capacity could fail during a fault, so oversizing slightly is often wise.

What types of MCB trip curves do you need?

Miniature Circuit Breakers (MCBs) have trip curves that define how quickly they respond to overcurrent. Common types include:

B Curve: Trips at 3-5 times the rated current. Best for general use like lighting or outlets.
C Curve: Trips at 5-10 times the rated current. Suited for motors or appliances with moderate startup surges.
D Curve: Trips at 10-15 times the rated current. Ideal for equipment with high inrush currents, like large motors or transformers.
Choose based on your load. For instance, a home lighting circuit might use a B curve, while a workshop motor might need a C or D curve to avoid nuisance tripping during startup.

Are there any specific safety features you require?

Additional safety features can enhance protection depending on your needs:

Ground Fault Circuit Interrupter (GFCI): Detects ground faults to prevent shocks. Required in wet areas like bathrooms or kitchens.
Arc Fault Circuit Interrupter (AFCI): Prevents fires by detecting arc faults. Often used in living areas like bedrooms.
Surge Protection: Shields electronics from voltage spikes, useful for sensitive equipment.
Smart Features: Allows remote monitoring or energy tracking, great for modern homes or businesses.

Accessories

We offer a wide variety of accessories to complement our extensive selection of circuit breakers. Some of these accessories include:

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Electronic trip unit

An intelligent circuit protection device that monitors current anomalies and quickly disconnects power to ensure the safety of equipment and lines.

Core Functions:

  • Overload Protection: Delayed cutoff to prevent damage.

  • Short Circuit Protection: Millisecond response for quick protection.

  • Ground Fault Protection: Prevents leakage fires.

  • Customizable Parameters: Adjustable thresholds and delays.

Circuit breaker shunt coil

An electromagnetic device triggered by external electrical signals (e.g., fire alarm, PLC command) to quickly cut off the circuit and enable remote control of circuit breaker tripping.

Core Functions:

  • Remote Emergency Power Off: Cuts off power remotely in emergencies.

  • Automation System Linkage: Supports integration with systems like fire alarm to cut off non-fire power supply or emergency stop production lines.

  • Fast Response: ≤50ms response time.

Trusted Circuit Breaker Brands

Schneider Electric

Schneider Electric is dedicated to building a smarter, more efficient, and sustainable industrial future with advanced technologies and integrated solutions. The company focuses on continuous innovation and environmental responsibility to drive the industry forward.

Products include but are not limited to:

  • Intelligent circuit breakers and overload relays
  • Programmable logic controllers (PLCs)
  • Motor control and protection equipment fixed operation;
  • Energy management systems
  • Low-voltage power distribution products
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ABB

ABB is a global leader in power and automation technology, committed to sustainability and industrial transformation through innovation. As trusted Siemens circuit breaker distributors, we do more than just supply products.

Our specialists help you select the right high-performance molded case circuit breakers and ensure availability, backed by Siemens' continuous R&D investment.

Products include but are not limited to:

  • Inverters, motors and generators
  • Programmable logic controllers(PLCs)
  • Human-machine interfaces (HMIs)
  • Industrial software
  • Robotics and automation systems
  • Intelligent circuit breakers
  • Power quality products
  • Energy efficiency management systems
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Siemens

Siemens is dedicated to leading in electrical engineering and automation, shaping a smarter and more efficient industrial future with innovative solutions. As trusted siemens circuit breaker distributors, we supply their high-quality, eco-friendly products, including high-performance molded case circuit breakers, backed by continuous R&D investment.

Products include but are not limited to:

  • Contactors and overload relays
  • Programmable logic controllers (PLCs)
  • Manual and intelligent motor protectors
  • High-performance molded case circuit breakers
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CONTACT US

Looking for a reliable circuit breaker supplier of industrial electrical and automation products? Need options for circuit breaker wholesale?

SimplyBuy is your ideal choice!

We specialize in providing original and brand-new electrical control and automation products, covering renowned circuit breaker manufacturers such as Schneider, Siemens, Mitsubishi, ABB, and Omron. Whether you need a quick quote, technical support, or customized solutions, we respond within 12 hours to help your projects proceed smoothly.

Email

sales@simplying.com

Tel

+86 131-9261-2662

Address

No.600 Shenmei Road Pudong District ,Shanghai China 201318

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