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Miniature Circuit Breakers (MCBs)
Miniature Circuit Breakers (MCBs) - Telemecanique Sensors
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 124 products
Square D by Schneider Electric QOXD125 is a miniature circuit breaker (MCB) designed for branch circuit protection. It features a plug-in mounting mode and a plug-in connection type, facilitating easy installation. This MCB is rated for a current of 25A and can operate at rated voltages of 240V or 415V AC. It is a single-pole device, ensuring it can be used in a variety of circuit configurations. The QOXD125 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 QOBXD332 is a miniature circuit breaker (MCB) designed for branch circuit protection. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 32A and can operate at rated voltages of 240V or 415V AC. It is a 3-pole device, providing multi-phase protection, and has a short circuit breaking rating of 3kA at 415Vac. The QOBXD332 is equipped with press plate terminals for reliable wire connection.
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Square D by Schneider Electric QYU110 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 10A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for 1 cable Al/Cu and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals.
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Square D by Schneider Electric QYU125 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 25A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for one aluminum or copper cable and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals.
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Square D by Schneider Electric QYU115 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 15A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for one aluminum or copper cable and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals.
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Square D by Schneider Electric QOUR250 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 2-pole configuration and accommodates a wire cross-section of 14-2AWG for both aluminum and copper cables. This MCB is rated for a current of 50A and offers dual voltage operation with ratings of 48Vdc and 120/240Vac. The connection is facilitated through slotted box lugs on both the load and line sides. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. The terminals are designed as box lugs for secure and reliable connections.
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Square D by Schneider Electric QOUR235 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 35A and accommodates slotted box lugs connections on both the load and line sides. This MCB is compatible with a cross-section of 14-2AWG for one aluminum or copper cable and is equipped with two poles. It offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The QOUR235 operates with a rated voltage of 120V and 240V for AC, and 48Vdc for DC applications. Its terminals are of the box lugs type.
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Square D by Schneider Electric QOUR220 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 is compatible with a cross-section of 14-2AWG for one aluminum or copper cable and is equipped with two poles. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The rated voltage for AC operation is 120V to 240V, and for DC operation, it is 48Vdc. The terminals are of the box lugs type.
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Square D by Schneider Electric QOUR215 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 2-pole configuration and accommodates a wire cross-section of 14-2AWG for both aluminum and copper cables. This MCB is equipped with slotted box lugs connections on both the load and line sides, facilitating straightforward installation. It is rated for a current of 15A and can operate at a rated voltage of 120V or 240V AC, and 48V DC. The QOUR215 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. The terminals are designed as box lugs for secure and reliable connections.
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Square D by Schneider Electric QOUR2103100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 2-pole configuration and is capable of handling a rated current of 10A. 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 48Vdc and 120/240Vac, with a short circuit breaking rating of 10kA at 240Vac. The terminals are of the box lugs type, ensuring a secure connection.
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| Item | Manufacturer | Price | Stock | Delivery | |
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QOXD125 Square D by Schneider Electric QOXD125 is a miniature circuit breaker (MCB) designed for branch circuit protection. It features a plug-in mounting mode and a plug-in connection type, facilitating easy installation. This MCB is rated for a current of 25A and can operate at rated voltages of 240V or 415V AC. It is a single-pole device, ensuring it can be used in a variety of circuit configurations. The QOXD125 has a short circuit breaking rating of 3kA at 415Vac and is equipped with press plate terminals for secure wire connections. | Telemecanique Sensors | Quick Quote | |||
QOBXD332 Square D by Schneider Electric QOBXD332 is a miniature circuit breaker (MCB) designed for branch circuit protection. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 32A and can operate at rated voltages of 240V or 415V AC. It is a 3-pole device, providing multi-phase protection, and has a short circuit breaking rating of 3kA at 415Vac. The QOBXD332 is equipped with press plate terminals for reliable wire connection. | Telemecanique Sensors | Quick Quote | |||
QYU110 Square D by Schneider Electric QYU110 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 10A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for 1 cable Al/Cu and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals. | Telemecanique Sensors | Quick Quote | |||
QYU125 Square D by Schneider Electric QYU125 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 25A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for one aluminum or copper cable and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals. | Telemecanique Sensors | Quick Quote | |||
QYU115 Square D by Schneider Electric QYU115 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 15A and a rated voltage of 277V AC. This MCB accommodates a cross-section of 14-2AWG for one aluminum or copper cable and features 1 pole. It has a short circuit breaking rating of 5kA at 277Vac and is equipped with lug type terminals. | Telemecanique Sensors | Quick Quote | |||
QOUR250 Square D by Schneider Electric QOUR250 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 2-pole configuration and accommodates a wire cross-section of 14-2AWG for both aluminum and copper cables. This MCB is rated for a current of 50A and offers dual voltage operation with ratings of 48Vdc and 120/240Vac. The connection is facilitated through slotted box lugs on both the load and line sides. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. The terminals are designed as box lugs for secure and reliable connections. | Telemecanique Sensors | Quick Quote | |||
QOUR235 Square D by Schneider Electric QOUR235 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 35A and accommodates slotted box lugs connections on both the load and line sides. This MCB is compatible with a cross-section of 14-2AWG for one aluminum or copper cable and is equipped with two poles. It offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The QOUR235 operates with a rated voltage of 120V and 240V for AC, and 48Vdc for DC applications. Its terminals are of the box lugs type. | Telemecanique Sensors | Quick Quote | |||
QOUR220 Square D by Schneider Electric QOUR220 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 is compatible with a cross-section of 14-2AWG for one aluminum or copper cable and is equipped with two poles. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The rated voltage for AC operation is 120V to 240V, and for DC operation, it is 48Vdc. The terminals are of the box lugs type. | Telemecanique Sensors | Quick Quote | |||
QOUR215 Square D by Schneider Electric QOUR215 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 2-pole configuration and accommodates a wire cross-section of 14-2AWG for both aluminum and copper cables. This MCB is equipped with slotted box lugs connections on both the load and line sides, facilitating straightforward installation. It is rated for a current of 15A and can operate at a rated voltage of 120V or 240V AC, and 48V DC. The QOUR215 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. The terminals are designed as box lugs for secure and reliable connections. | Telemecanique Sensors | Quick Quote | |||
QOUR2103100 Square D by Schneider Electric QOUR2103100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 2-pole configuration and is capable of handling a rated current of 10A. 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 48Vdc and 120/240Vac, with a short circuit breaking rating of 10kA at 240Vac. The terminals are of the box lugs type, ensuring a secure connection. | Telemecanique Sensors | 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.