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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
Square D by Schneider Electric QOU325VH is a unit-mount miniature circuit breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and is capable of handling a rated current of 25A. This MCB is equipped with slotted box lugs connections for both load and line sides, facilitating secure and straightforward installation. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU325VH operates at a rated voltage of 120V to 240V AC and offers a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, ensuring a reliable connection.
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Square D by Schneider Electric QOU2702100 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This MCB features an alarm/fault trip signalling switch, enhancing its functionality. It supports a rated current of 70A and accommodates slotted box lugs connections on both the load and line sides. The QOU2702100 is compatible with a rated voltage of 48Vdc and 120V/240V AC, with a cross-section capacity for 12-2/0AWG(1 cable Al/Cu). It is a 2 Pole device, ensuring it can interrupt circuits in both lines simultaneously. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, with box lugs as the type of terminals used for connections.
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Square D by Schneider Electric QOU245VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 45A 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 QOU245VH utilizes box lugs as its type of terminals.
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Square D by Schneider Electric QO2801042 is a Miniature Circuit Breaker (MCB) featuring a shunt trip coil. It is designed for plug-in mounting and has a rated current of 80A with a plug-in connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a wire cross-section of 4-2/0AWG for one aluminum or copper cable. It is a 2-pole device with a control voltage range of 12Vdc to 24Vdc. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 48Vdc, utilizing box lugs as the type of terminals.
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Square D by Schneider Electric QO2601201 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1b function. It is designed for plug-in mounting and supports a rated current of 60A with a plug-in connection type. This MCB operates at a rated voltage of 48Vdc and 120/240Vac, accommodating a cross-section of 8-2AWG for 1 cable Al/Cu. It is equipped with 2 poles and 1 Normally Closed (NC) auxiliary contact. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 48Vdc, with box lugs serving as the type of terminals.
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Schneider Electric M9F53163 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single pole configuration. It features a rated current of 63A and operates with a rated insulation voltage (Ui) of 500V. The MCB is engineered to withstand rated impulse voltages (Uimp) up to 6kV and offers a short circuit breaking rating of 10kA AIR across 120Vac, 240Vac, and 60Vdc. It supports a rated voltage (AC) for phase-to-phase connections up to 440V. This product ensures protection for 1 pole and is characterized by a D tripping curve, compliant with UL489 standards.
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Schneider Electric M9F23450 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with a 4 Pole configuration and a rated current of 50A. 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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Square D by Schneider Electric QOUQ335 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 3-pole configuration and is capable of handling a rated current of 35A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. It operates at a rated voltage of 120V and 240V AC, as well as 48V DC. The QOUQ335 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs as the type of terminals.
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Square D by Schneider Electric QOUQ225 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. It features a 2-pole configuration and is capable of handling a rated current of 25A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG (1 cable Al/Cu). It operates at a rated voltage of 120V and 240V AC, as well as 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, facilitating secure and reliable connections.
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Square D by Schneider Electric QOU3602100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an alarm/fault trip signalling switch, enhancing its functionality. This 3-pole MCB is rated for 60A and accommodates connections via slotted box lugs on both the load and line sides. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU3602100 is designed to operate at a rated voltage of 120V or 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240V AC and 5kA at 48V DC. The terminals are box lug type, facilitating secure and reliable connections.
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| Item | Manufacturer | Price | Stock | Delivery | |
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QOU325VH Square D by Schneider Electric QOU325VH is a unit-mount miniature circuit breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and is capable of handling a rated current of 25A. This MCB is equipped with slotted box lugs connections for both load and line sides, facilitating secure and straightforward installation. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU325VH operates at a rated voltage of 120V to 240V AC and offers a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, ensuring a reliable connection. | Schneider Electric | Quick Quote | |||
QOU2702100 Square D by Schneider Electric QOU2702100 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This MCB features an alarm/fault trip signalling switch, enhancing its functionality. It supports a rated current of 70A and accommodates slotted box lugs connections on both the load and line sides. The QOU2702100 is compatible with a rated voltage of 48Vdc and 120V/240V AC, with a cross-section capacity for 12-2/0AWG(1 cable Al/Cu). It is a 2 Pole device, ensuring it can interrupt circuits in both lines simultaneously. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, with box lugs as the type of terminals used for connections. | Schneider Electric | Quick Quote | |||
QOU245VH Square D by Schneider Electric QOU245VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 45A 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 QOU245VH utilizes box lugs as its type of terminals. | Schneider Electric | Quick Quote | |||
QO2801042 Square D by Schneider Electric QO2801042 is a Miniature Circuit Breaker (MCB) featuring a shunt trip coil. It is designed for plug-in mounting and has a rated current of 80A with a plug-in connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a wire cross-section of 4-2/0AWG for one aluminum or copper cable. It is a 2-pole device with a control voltage range of 12Vdc to 24Vdc. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 48Vdc, utilizing box lugs as the type of terminals. | Schneider Electric | Quick Quote | |||
QO2601201 Square D by Schneider Electric QO2601201 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1b function. It is designed for plug-in mounting and supports a rated current of 60A with a plug-in connection type. This MCB operates at a rated voltage of 48Vdc and 120/240Vac, accommodating a cross-section of 8-2AWG for 1 cable Al/Cu. It is equipped with 2 poles and 1 Normally Closed (NC) auxiliary contact. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 48Vdc, with box lugs serving as the type of terminals. | Schneider Electric | Quick Quote | |||
M9F53163 Schneider Electric M9F53163 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single pole configuration. It features a rated current of 63A and operates with a rated insulation voltage (Ui) of 500V. The MCB is engineered to withstand rated impulse voltages (Uimp) up to 6kV and offers a short circuit breaking rating of 10kA AIR across 120Vac, 240Vac, and 60Vdc. It supports a rated voltage (AC) for phase-to-phase connections up to 440V. This product ensures protection for 1 pole and is characterized by a D tripping curve, compliant with UL489 standards. | Schneider Electric | Quick Quote | |||
M9F23450 Schneider Electric M9F23450 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with a 4 Pole configuration and a rated current of 50A. 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 | |||
QOUQ335 Square D by Schneider Electric QOUQ335 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 3-pole configuration and is capable of handling a rated current of 35A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. It operates at a rated voltage of 120V and 240V AC, as well as 48V DC. The QOUQ335 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs as the type of terminals. | Schneider Electric | Quick Quote | |||
QOUQ225 Square D by Schneider Electric QOUQ225 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. It features a 2-pole configuration and is capable of handling a rated current of 25A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG (1 cable Al/Cu). It operates at a rated voltage of 120V and 240V AC, as well as 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, facilitating secure and reliable connections. | Schneider Electric | Quick Quote | |||
QOU3602100 Square D by Schneider Electric QOU3602100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an alarm/fault trip signalling switch, enhancing its functionality. This 3-pole MCB is rated for 60A and accommodates connections via slotted box lugs on both the load and line sides. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU3602100 is designed to operate at a rated voltage of 120V or 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240V AC and 5kA at 48V DC. The terminals are box lug type, facilitating secure and reliable connections. | 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.