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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 QOXD363 is a Miniature Circuit Breaker (MCB) designed for branch circuit protection. It features a plug-in mounting mode for easy installation and utilizes a plug-in connection type for establishing electrical circuits. This MCB is rated for a current of 63A and can operate at rated voltages of 240V or 415V AC. It is a 3 Pole device, ensuring it can control multiple circuits simultaneously. The QOXD363 has a short circuit breaking rating of 3kA at 415Vac and is equipped with press plate terminals for secure wire connections.
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Square D by Schneider Electric QOU3701200 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 70A rated current. This MCB offers slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG(1 cable Al/Cu). It operates on a 3 Pole system with 1 Normally Open (NO) auxiliary contact. The QOU3701200 is capable of handling rated voltages of 60Vdc and 120V/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. Its terminals are designed as box lugs.
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Square D by Schneider Electric QOU2401200 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 40A rated current. This MCB offers slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. It operates on a 2 Pole system with 1 Normally Open (NO) auxiliary contact. The QOU2401200 is capable of handling rated voltages of 48Vdc and 120V/240V AC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. Its terminals are designed as box lugs.
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Square D by Schneider Electric QO315EPD is a Miniature Circuit Breaker (MCB) designed with Equipment Protection Device (EPD) functionality, offering ground fault protection. This 3 Pole circuit breaker features a plug-in mounting mode and a plug-in connection type, facilitating easy installation. It is rated for a current of 15A and a voltage of 240V AC. The QO315EPD can accommodate a wire cross-section of 14-8AWG for one copper cable. It has a residual current sensitivity of 30mA/0.03 and a short circuit breaking rating of 10kA at 240Vac. The terminals are of the press plate type, ensuring secure connections.
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Square D by Schneider Electric QO2201201 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1b function. It is designed for plug-in mounting and supports a plug-in connection type. This MCB is rated for a current of 20A and can accommodate a wire cross-section of 14-8AWG for both aluminum and copper cables. It operates on a 2 Pole system with 1 Normally Closed (NC) auxiliary contact. The QO2201201 has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with a rated voltage of 120V to 240V AC and 48Vdc. It utilizes press plate type terminals for connections.
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Square D by Schneider Electric EJB14030EPDBA is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting with a visual trip indicator. It features lugs type terminals and operates at a rated voltage of 277 V AC. This MCB serves as an Equipment Protection Device (EPD) and Circuit Breaker (CB) with an alarm/fault trip signaling switch plus an Earth-leakage module, offering short-circuit and overload protection functions. It is equipped with aluminium lugs for connection, supports a rated current of 30A, and is a single-pole device. The residual current sensitivity is set at 30mA/0.03, and it accommodates a cross-section of 14-6AWG for one copper cable. Its short circuit breaking rating is 100kA at 120Vac, 65kA at 240Vac, and 65kA at 277Vac. The EJB14030EPDBA utilizes a thermal-magnetic trip unit with protection settings at a trip unit rating of 875A.
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Schneider Electric M9F53245 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed to comply with UL489 standards. This 2-pole MCB has a rated current of 45A and features a rated insulation voltage (Ui) of 500V, with a rated impulse voltage (Uimp) of 6kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. The M9F53245 operates with a rated voltage (AC) for phase-to-phase connections at 440V and protects 2 poles. It is equipped with a D tripping curve.
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Schneider Electric M9F43345 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed to comply with UL489 standards. This 3 Pole MCB has a rated current of 45A and features a rated insulation voltage (Ui) of 500V, with a DC rated voltage of 60Vdc. 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 480Y/277Vac as well as 60Vdc. For AC applications, it supports a rated voltage of 240V phase-to-neutral and 415V phase-to-phase. All three poles are protected, and it operates with a D tripping curve.
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Schneider Electric M9F23345 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed to provide circuit protection. It features a 3 Pole configuration and is rated for a current of 45A. This MCB has a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac, with all three poles protected. It operates with a D tripping curve.
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Schneider Electric M9F23163 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 63A and is compliant with UL1077 standards. The MCB operates with a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC operating voltage (Ue) of 415V. It is capable of handling an impulse voltage (Uimp) of 6kV. The short circuit breaking rating is specified as 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 65Vdc. For AC applications, the phase-to-neutral rated voltage is 277V. This product protects a single pole and utilizes a D tripping curve.
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| Item | Manufacturer | Price | Stock | Delivery | |
|---|---|---|---|---|---|
QOXD363 Square D by Schneider Electric QOXD363 is a Miniature Circuit Breaker (MCB) designed for branch circuit protection. It features a plug-in mounting mode for easy installation and utilizes a plug-in connection type for establishing electrical circuits. This MCB is rated for a current of 63A and can operate at rated voltages of 240V or 415V AC. It is a 3 Pole device, ensuring it can control multiple circuits simultaneously. The QOXD363 has a short circuit breaking rating of 3kA at 415Vac and is equipped with press plate terminals for secure wire connections. | Schneider Electric | Quick Quote | |||
QOU3701200 Square D by Schneider Electric QOU3701200 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 70A rated current. This MCB offers slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG(1 cable Al/Cu). It operates on a 3 Pole system with 1 Normally Open (NO) auxiliary contact. The QOU3701200 is capable of handling rated voltages of 60Vdc and 120V/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. Its terminals are designed as box lugs. | Schneider Electric | Quick Quote | |||
QOU2401200 Square D by Schneider Electric QOU2401200 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 40A rated current. This MCB offers slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. It operates on a 2 Pole system with 1 Normally Open (NO) auxiliary contact. The QOU2401200 is capable of handling rated voltages of 48Vdc and 120V/240V AC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. Its terminals are designed as box lugs. | Schneider Electric | Quick Quote | |||
QO315EPD Square D by Schneider Electric QO315EPD is a Miniature Circuit Breaker (MCB) designed with Equipment Protection Device (EPD) functionality, offering ground fault protection. This 3 Pole circuit breaker features a plug-in mounting mode and a plug-in connection type, facilitating easy installation. It is rated for a current of 15A and a voltage of 240V AC. The QO315EPD can accommodate a wire cross-section of 14-8AWG for one copper cable. It has a residual current sensitivity of 30mA/0.03 and a short circuit breaking rating of 10kA at 240Vac. The terminals are of the press plate type, ensuring secure connections. | Schneider Electric | Quick Quote | |||
QO2201201 Square D by Schneider Electric QO2201201 is a Miniature Circuit Breaker (MCB) featuring an auxiliary switch with 1b function. It is designed for plug-in mounting and supports a plug-in connection type. This MCB is rated for a current of 20A and can accommodate a wire cross-section of 14-8AWG for both aluminum and copper cables. It operates on a 2 Pole system with 1 Normally Closed (NC) auxiliary contact. The QO2201201 has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with a rated voltage of 120V to 240V AC and 48Vdc. It utilizes press plate type terminals for connections. | Schneider Electric | Quick Quote | |||
EJB14030EPDBA Square D by Schneider Electric EJB14030EPDBA is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting with a visual trip indicator. It features lugs type terminals and operates at a rated voltage of 277 V AC. This MCB serves as an Equipment Protection Device (EPD) and Circuit Breaker (CB) with an alarm/fault trip signaling switch plus an Earth-leakage module, offering short-circuit and overload protection functions. It is equipped with aluminium lugs for connection, supports a rated current of 30A, and is a single-pole device. The residual current sensitivity is set at 30mA/0.03, and it accommodates a cross-section of 14-6AWG for one copper cable. Its short circuit breaking rating is 100kA at 120Vac, 65kA at 240Vac, and 65kA at 277Vac. The EJB14030EPDBA utilizes a thermal-magnetic trip unit with protection settings at a trip unit rating of 875A. | Schneider Electric | Quick Quote | |||
M9F53245 Schneider Electric M9F53245 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed to comply with UL489 standards. This 2-pole MCB has a rated current of 45A and features a rated insulation voltage (Ui) of 500V, with a rated impulse voltage (Uimp) of 6kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. The M9F53245 operates with a rated voltage (AC) for phase-to-phase connections at 440V and protects 2 poles. It is equipped with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F43345 Schneider Electric M9F43345 is a Miniature Circuit Breaker (MCB) within the C60BP sub-range, designed to comply with UL489 standards. This 3 Pole MCB has a rated current of 45A and features a rated insulation voltage (Ui) of 500V, with a DC rated voltage of 60Vdc. 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 480Y/277Vac as well as 60Vdc. For AC applications, it supports a rated voltage of 240V phase-to-neutral and 415V phase-to-phase. All three poles are protected, and it operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F23345 Schneider Electric M9F23345 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed to provide circuit protection. It features a 3 Pole configuration and is rated for a current of 45A. This MCB has a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac, with all three poles protected. It operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F23163 Schneider Electric M9F23163 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 63A and is compliant with UL1077 standards. The MCB operates with a rated insulation voltage (Ui) of 500V, a DC rated voltage of 60Vdc, and an AC operating voltage (Ue) of 415V. It is capable of handling an impulse voltage (Uimp) of 6kV. The short circuit breaking rating is specified as 14kA AIR at both 120Vac and 240Vac, and 10kA AIR at 277Vac and 65Vdc. For AC applications, the phase-to-neutral rated voltage is 277V. This product protects a single pole and utilizes a D tripping curve. | 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.