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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 M9F23363 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 63A. 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 M9F23150 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 50A and is compliant with UL1077 standards. The MCB has 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 rated impulse voltages (Uimp) up to 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 is characterized by a D tripping curve.
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Schneider Electric M9F23145 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 45A 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 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 65Vdc. The rated voltage for phase-to-neutral applications is 277V. This model protects a single pole and follows a D tripping curve.
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Square D by Schneider Electric QOU1401200 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a single pole configuration. This MCB is rated for a current of 40A and accommodates connections via slotted box lugs on both the load and line sides. It supports a cross-section of 14-2AWG for one cable, either aluminum or copper. The QOU1401200 is capable of operating at a rated voltage of 48Vdc and 120/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. It includes one normally open (NO) auxiliary contact and utilizes box lugs for terminal connections.
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Square D by Schneider Electric QOB245H is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting. It features a rated current of 45A and accommodates a bolt-on connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with 8-2AWG (1 cable Al/Cu) cross-section. It is a 2 Pole device with a short circuit breaking rating of 10kA at 240Vac. The QOB245H is equipped with box lugs type of terminals.
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Square D by Schneider Electric QO170VH is a Miniature Circuit Breaker (MCB) designed for plug-in mounting. It features a rated current of 70A and accommodates a plug-in connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with 8-2AWG (1 cable Al/Cu) cross-section. It is a single-pole circuit breaker with a short circuit breaking rating of 22kA at 240Vac. The QO170VH is equipped with box lugs type of terminals.
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Square D by Schneider Electric QO1201201 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 single pole and includes 1 Normally Closed (NC) auxiliary contact. The QO1201201 is capable of handling a rated voltage of 120V to 240V AC and 48Vdc, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the press plate type, ensuring secure connections.
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Square D by Schneider Electric QOU140VH is a unit-mount Miniature Circuit Breaker (MCB) designed for a single-pole configuration. It features slotted box lugs connections on both the 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 40A and supports rated voltages of 120V and 240V AC, with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, ensuring a secure connection for the designated wire sizes.
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Square D by Schneider Electric QOB2100Z is a Miniature Circuit Breaker (MCB) designed with a rated current of 100A and a bolt-on connection type. It operates on a rated voltage of 120 V to 240 V AC and is configured with 2 poles.
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Square D by Schneider Electric QO130EPD1201 is a Miniature Circuit Breaker (MCB) designed for equipment protection with integrated ground fault protection and an auxiliary switch featuring 1b (1 Normally Closed contact). This plug-in type MCB is rated for a current of 30A and operates at a voltage of 120V AC. It accommodates a wire cross-section of 14-8AWG for a single copper cable and is equipped with one pole. The residual current sensitivity is set at 30mA / 0.03. It offers ground fault protection and has a short circuit breaking rating of 10kA at 120Vac. The terminals are of the press plate type, facilitating secure connections.
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| Item | Manufacturer | Price | Stock | Delivery | |
|---|---|---|---|---|---|
M9F23363 Schneider Electric M9F23363 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 63A. 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 | |||
M9F23150 Schneider Electric M9F23150 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 50A and is compliant with UL1077 standards. The MCB has 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 rated impulse voltages (Uimp) up to 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 is characterized by a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F23145 Schneider Electric M9F23145 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed for a single pole configuration. It features a rated current of 45A 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 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 65Vdc. The rated voltage for phase-to-neutral applications is 277V. This model protects a single pole and follows a D tripping curve. | Schneider Electric | Quick Quote | |||
QOU1401200 Square D by Schneider Electric QOU1401200 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a single pole configuration. This MCB is rated for a current of 40A and accommodates connections via slotted box lugs on both the load and line sides. It supports a cross-section of 14-2AWG for one cable, either aluminum or copper. The QOU1401200 is capable of operating at a rated voltage of 48Vdc and 120/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. It includes one normally open (NO) auxiliary contact and utilizes box lugs for terminal connections. | Schneider Electric | Quick Quote | |||
QOB245H Square D by Schneider Electric QOB245H is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting. It features a rated current of 45A and accommodates a bolt-on connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with 8-2AWG (1 cable Al/Cu) cross-section. It is a 2 Pole device with a short circuit breaking rating of 10kA at 240Vac. The QOB245H is equipped with box lugs type of terminals. | Schneider Electric | Quick Quote | |||
QO170VH Square D by Schneider Electric QO170VH is a Miniature Circuit Breaker (MCB) designed for plug-in mounting. It features a rated current of 70A and accommodates a plug-in connection type. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with 8-2AWG (1 cable Al/Cu) cross-section. It is a single-pole circuit breaker with a short circuit breaking rating of 22kA at 240Vac. The QO170VH is equipped with box lugs type of terminals. | Schneider Electric | Quick Quote | |||
QO1201201 Square D by Schneider Electric QO1201201 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 single pole and includes 1 Normally Closed (NC) auxiliary contact. The QO1201201 is capable of handling a rated voltage of 120V to 240V AC and 48Vdc, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the press plate type, ensuring secure connections. | Schneider Electric | Quick Quote | |||
QOU140VH Square D by Schneider Electric QOU140VH is a unit-mount Miniature Circuit Breaker (MCB) designed for a single-pole configuration. It features slotted box lugs connections on both the 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 40A and supports rated voltages of 120V and 240V AC, with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, ensuring a secure connection for the designated wire sizes. | Schneider Electric | Quick Quote | |||
QOB2100Z Square D by Schneider Electric QOB2100Z is a Miniature Circuit Breaker (MCB) designed with a rated current of 100A and a bolt-on connection type. It operates on a rated voltage of 120 V to 240 V AC and is configured with 2 poles. | Schneider Electric | Quick Quote | |||
QO130EPD1201 Square D by Schneider Electric QO130EPD1201 is a Miniature Circuit Breaker (MCB) designed for equipment protection with integrated ground fault protection and an auxiliary switch featuring 1b (1 Normally Closed contact). This plug-in type MCB is rated for a current of 30A and operates at a voltage of 120V AC. It accommodates a wire cross-section of 14-8AWG for a single copper cable and is equipped with one pole. The residual current sensitivity is set at 30mA / 0.03. It offers ground fault protection and has a short circuit breaking rating of 10kA at 120Vac. The terminals are of the press plate type, facilitating secure 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.