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Miniature Circuit Breakers (MCBs)
Miniature Circuit Breakers (MCBs) - Schneider Electric
An MCB is an automatically operated electrical switch. Miniature circuit breakers are intended to prevent damage to an electrical circuit as a result of excess current.
Found 85 products
Schneider Electric M9F53250 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 2 Pole configuration and a rated current of 50A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. It is designed for a rated voltage (AC) phase-to-phase of 440 V and protects 2 poles. The tripping curve for this breaker is classified as D, and it is compliant with UL489 standards.
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Square D by Schneider Electric QOB330PL is a Powerlink Miniature Circuit Breaker (MCB) designed for remote operation and control. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 30A and operates at a rated voltage of 240V AC. It accommodates a wire cross-section of 12-2AWG for one aluminum cable and is equipped with three poles. The QOB330PL has a short circuit breaking rating of 10kA at 240Vac and utilizes box lugs for its terminal connections.
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Square D by Schneider Electric QOUR220VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 20A and accommodates slotted box lugs connections on both the load and line sides. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a cross-section of 14-2AWG for one aluminum or copper cable. It is a 2-pole device with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward connections.
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Square D by Schneider Electric QOUQ115 is a unit-mount Miniature Circuit Breaker (MCB) designed for a single pole configuration. It features slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for one aluminum or copper cable. This MCB is rated for a current of 15A and supports rated voltages of 48Vdc and 120V/240V AC. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward installations.
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Square D by Schneider Electric QO31001200 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1a functionality. It is designed for plug-in mounting and supports a plug-in connection type. This MCB is rated for a current of 100A and can operate at rated voltages of 120V to 240V AC. It accommodates a wire cross-section of 4-2/0AWG for 1 cable Al/Cu. The QO31001200 is a 3 Pole device equipped with 1 Normally Open (NO) auxiliary contact. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs serving as the type of terminals.
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Schneider Electric M9F53363 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 3 Pole configuration and a rated current of 63A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc, with a rated voltage (AC) for phase-to-phase connections at 440 V. All three poles are protected, and it operates with a D tripping curve, compliant with UL489 standards.
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Schneider Electric M9F43163 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed for a single pole configuration. It features a rated current of 63A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped with a rated impulse voltage (Uimp) of 6kV and offers a short circuit breaking rating of 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 60Vdc. The protected pole count is 1, and it operates with a D tripping curve.
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Schneider Electric M9F43150 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed to comply with UL489 standards. It features a single pole configuration and is rated for a current of 50A. The MCB has a rated insulation voltage (Ui) of 500V, with a DC rated voltage of 60Vdc and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped to handle rated impulse voltage (Uimp) of 6kV. The short circuit breaking rating is specified at 14kA AIR for both 120Vac and 240Vac, and 10kA AIR for 277Vac and 60Vdc. The protected pole count is one, and it operates with a D tripping curve.
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Schneider Electric M9F43145 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed for a single pole configuration. It features a rated current of 45A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped with a rated impulse voltage (Uimp) of 6kV and offers a short circuit breaking rating of 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 60Vdc. The device protects one pole and operates with a D tripping curve.
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Schneider Electric M9F23445 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with 4 poles and a rated current of 45A. It features a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac. All four poles are protected, and it operates with a D tripping curve. This MCB is compliant with UL1077 standards.
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| Item | Manufacturer | Price | Stock | Delivery | |
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M9F53250 Schneider Electric M9F53250 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 2 Pole configuration and a rated current of 50A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. It is designed for a rated voltage (AC) phase-to-phase of 440 V and protects 2 poles. The tripping curve for this breaker is classified as D, and it is compliant with UL489 standards. | Schneider Electric | 2 in stock | Quick Quote | ||
| QOB330PL Square D by Schneider Electric QOB330PL is a Powerlink Miniature Circuit Breaker (MCB) designed for remote operation and control. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 30A and operates at a rated voltage of 240V AC. It accommodates a wire cross-section of 12-2AWG for one aluminum cable and is equipped with three poles. The QOB330PL has a short circuit breaking rating of 10kA at 240Vac and utilizes box lugs for its terminal connections. | Schneider Electric | Quick Quote | ||
QOUR220VH Square D by Schneider Electric QOUR220VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 20A and accommodates slotted box lugs connections on both the load and line sides. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a cross-section of 14-2AWG for one aluminum or copper cable. It is a 2-pole device with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward connections. | Schneider Electric | Quick Quote | |||
QOUQ115 Square D by Schneider Electric QOUQ115 is a unit-mount Miniature Circuit Breaker (MCB) designed for a single pole configuration. It features slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for one aluminum or copper cable. This MCB is rated for a current of 15A and supports rated voltages of 48Vdc and 120V/240V AC. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward installations. | Schneider Electric | Quick Quote | |||
QO31001200 Square D by Schneider Electric QO31001200 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1a functionality. It is designed for plug-in mounting and supports a plug-in connection type. This MCB is rated for a current of 100A and can operate at rated voltages of 120V to 240V AC. It accommodates a wire cross-section of 4-2/0AWG for 1 cable Al/Cu. The QO31001200 is a 3 Pole device equipped with 1 Normally Open (NO) auxiliary contact. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs serving as the type of terminals. | Schneider Electric | Quick Quote | |||
M9F53363 Schneider Electric M9F53363 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 3 Pole configuration and a rated current of 63A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc, with a rated voltage (AC) for phase-to-phase connections at 440 V. All three poles are protected, and it operates with a D tripping curve, compliant with UL489 standards. | Schneider Electric | Quick Quote | |||
M9F43163 Schneider Electric M9F43163 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed for a single pole configuration. It features a rated current of 63A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped with a rated impulse voltage (Uimp) of 6kV and offers a short circuit breaking rating of 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 60Vdc. The protected pole count is 1, and it operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F43150 Schneider Electric M9F43150 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed to comply with UL489 standards. It features a single pole configuration and is rated for a current of 50A. The MCB has a rated insulation voltage (Ui) of 500V, with a DC rated voltage of 60Vdc and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped to handle rated impulse voltage (Uimp) of 6kV. The short circuit breaking rating is specified at 14kA AIR for both 120Vac and 240Vac, and 10kA AIR for 277Vac and 60Vdc. The protected pole count is one, and it operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F43145 Schneider Electric M9F43145 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed for a single pole configuration. It features a rated current of 45A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC rated voltage of 240V phase-to-neutral and 415V phase-to-phase. It is equipped with a rated impulse voltage (Uimp) of 6kV and offers a short circuit breaking rating of 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 60Vdc. The device protects one pole and operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F23445 Schneider Electric M9F23445 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with 4 poles and a rated current of 45A. It features a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac. All four poles are protected, and it operates with a D tripping curve. This MCB is compliant with UL1077 standards. | Schneider Electric | Quick Quote | |||
Miniature Circuit Breakers (MCBs)
General Guide & Overview
Welcome to our comprehensive guide on miniature circuit breakers (MCBs). Whether you're an electrical professional or simply interested in understanding the inner workings of your home's electrical system, this article will provide you with all the information you need about MCBs.
MCBs are vital components of electrical systems, offering crucial protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that respond to changes in current flow. This innovative technology not only enhances safety but also improves convenience for users.
In this guide, we will explore how MCBs work, the different types available, and the advantages they offer. So let's dive in and unlock the mysteries behind these essential electrical devices.
How Does a Miniature Circuit Breaker Work?
A miniature circuit breaker (MCB) is a vital component of an electrical system, designed to protect against overloads and short circuits. Understanding how an MCB works can help you ensure the safety and efficiency of your electrical installations.
MCBs operate by utilizing two types of tripping mechanisms: thermal tripping and magnetic tripping.
Thermal Tripping
Thermal tripping is the primary mechanism in MCBs. It detects and responds to excessive heat caused by an overload in the circuit. Inside the MCB, there is a bimetallic strip made of two different metals with different expansion coefficients. When the current passing through the MCB exceeds its rated capacity, the bimetallic strip heats up, causing the metals to expand at different rates. As a result, the strip bends and activates the trip mechanism, opening the contacts to interrupt the current flow.
Magnetic Tripping
Magnetic tripping is a secondary mechanism in MCBs. It provides rapid protection against short circuits by detecting strong current surges. Inside the MCB, there is an electromagnetic coil surrounding the current-carrying contacts. When a short circuit occurs, an extremely high current flows through the coil, generating a magnetic field that attracts the armature. The armature then trips the mechanism, opening the contacts and isolating the faulty circuit from the power supply.
The integration of both thermal and magnetic tripping mechanisms allows MCBs to provide reliable protection against a wide range of electrical faults. By quickly detecting and responding to abnormal current conditions, MCBs help prevent damage to electrical equipment, reduce the risk of electrical fires, and ensure the uninterrupted supply of electricity.
Advantages and Application of Miniature Circuit Breakers (MCBs)
Miniature circuit breakers (MCBs) provide a host of advantages compared to traditional fuses. One key advantage is their high responsiveness to changes in current flow, enabling swift and effective protection against overloads and short circuits. With MCBs, you can ensure that your electrical system remains safe and reliable.
MCBs are designed with a trip-free switching mechanism that instantly cuts off power in the event of an overload. This feature enhances the safety of your electrical circuits, preventing any potential damage or hazards. Additionally, MCBs are incredibly user-friendly, offering ease of installation and operation.
Another advantage of MCBs is the wide variety of models available, catering to different application requirements. Whether you need a specific current rating, breaking capacity, or fault protection characteristics, there is an MCB type that suits your needs. This flexibility allows for customization and ensures optimal performance, making MCBs a versatile choice for various electrical systems and applications.
FAQ
What is a miniature circuit breaker (MCB)?
A miniature circuit breaker (MCB) is an important component of an electrical system that provides protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that open and close in response to changes in current flow, offering improved safety and convenience.
How does a miniature circuit breaker (MCB) work?
A miniature circuit breaker (MCB) works by using two types of tripping mechanisms: thermal tripping and magnetic tripping. Thermal tripping responds to excessive heat caused by an overload, while magnetic tripping responds to sudden increases in current flow caused by a short circuit.
What are the advantages of using miniature circuit breakers (MCBs)?
Miniature circuit breakers (MCBs) offer several advantages over traditional fuses. They are highly responsive to changes in current flow and provide reliable protection against overloads and short circuits. MCBs are easy to use, with a trip-free switching mechanism that instantly shuts off power in the event of an overload. They also have a wide range of models available, allowing for customization based on specific application requirements.