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Miniature Circuit Breakers (MCBs)
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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.
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QYU120
Square D by Schneider Electric QYU120 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 20A 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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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.
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QOW130
Square D by Schneider Electric QOW130 is a Miniature Circuit Breaker (MCB) designed for plug-in mounting. It features a rated current of 30A and accommodates a plug-in connection type. This MCB is suitable for use with a voltage rating of 120V to 240V AC and 48Vdc, supporting a cross-section of 14-8AWG for 1 aluminum or copper cable. It is a single-pole device with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The QOW130 is equipped with press plate type terminals.
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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.
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QOW120
Square D by Schneider Electric QOW120 is a Miniature Circuit Breaker (MCB) designed for plug-in mounting. It features a plug-in connection type and is suitable for a single cable of aluminum or copper ranging from 14-8AWG. This MCB is rated for a current of 20A and can operate at a rated voltage of 120V to 240V AC or 48V DC. It is equipped with one pole and has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The QOW120 utilizes press plate type terminals for connections.
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QOUR360
Square D by Schneider Electric QOUR360 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and accommodates a rated current of 60A. This MCB is compatible with both AC and DC applications, supporting rated voltages of 120V and 240V for AC, and 48Vdc for DC. It is equipped with slotted box lugs connections on both the load and line sides, facilitating straightforward installation. The QOUR360 is designed to handle wires with a cross-section of 14-2AWG (1 cable Al/Cu), ensuring compatibility with a wide range of wiring requirements. Its short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, with box lugs serving as the type of terminals.
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QOUR3605283
Square D by Schneider Electric QOUR3605283 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This MCB features ring tongue connections on both the load and line sides, facilitating secure and straightforward wiring. It is rated for a current of 60A and can operate at a DC voltage of 48Vdc and AC voltages of 120V and 240V. The device is constructed with 3 poles and has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are specifically designed to accommodate ring tongue connectors, ensuring a reliable connection.
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QOUR350
Square D by Schneider Electric QOUR350 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and accommodates a rated current of 50A. This MCB is compatible with both AC and DC circuits, supporting rated voltages of 120V and 240V for AC, and 48Vdc for DC. It is equipped with slotted box lugs connections on both the load and line sides, facilitating connections with a cross-section range of 14-2AWG for either aluminum or copper cables. The QOUR350 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, utilizing box lugs as its terminal type.
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QOUR340
Square D by Schneider Electric QOUR340 is a unit-mount Miniature Circuit Breaker (MCB) designed for effective circuit protection. This 3-pole MCB is capable of handling a rated current of 40A and accommodates a wire cross-section of 14-2AWG for both aluminum and copper cables. It features slotted box lugs connections on both the load and line sides, ensuring a secure and reliable connection. The QOUR340 is versatile in its application with a rated voltage of 120V to 240V AC and 48V DC, making it suitable for a wide range of electrical systems. Its short circuit breaking rating stands at 10kA for 240V AC and 5kA for 48V DC, highlighting its capability to handle significant fault conditions. The device utilizes box lugs as its type of terminals, further emphasizing its ease of installation and maintenance.
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QOUR3305283CCC
Square D by Schneider Electric QOUR3305283CCC is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and supports a rated current of 30A. This MCB is equipped with ring tongue connections for both load and line sides, facilitating straightforward installation. It operates at a rated voltage of 120V and 240V for AC circuits, and 48Vdc for DC circuits. The QOUR3305283CCC offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. Its terminals are designed to accommodate ring tongue connectors, enhancing the reliability of connections.
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QOUR330
Square D by Schneider Electric QOUR330 is a miniature circuit breaker (MCB) designed for unit mount installation. 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 3-pole MCB is rated for a current of 30A and supports rated voltages of 48Vdc and 120/240Vac. Its short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, with box lugs serving as the type of terminals.
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QOUR325
Square D by Schneider Electric QOUR325 is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 3-pole configuration and accommodates a rated current of 25A. This MCB is compatible with slotted box lugs connections on both the load and line sides, ensuring a secure and stable connection. It is designed to work with a cross-section of 14-2AWG (1 cable Al/Cu), making it versatile for various wiring needs. The QOUR325 offers a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. Its terminals are of the box lugs type, facilitating straightforward installation and maintenance.
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QOUR3305283
Square D by Schneider Electric QOUR3305283 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features ring tongue connections on both the load and line sides, facilitating secure and straightforward wiring. This 3-pole MCB is rated for a current of 30A and can operate at a rated voltage of 120V or 240V AC and 48V DC. It has a short circuit breaking rating of 10kA at 240V AC and 5kA at 48V DC, ensuring protection against overcurrents and short circuits in a variety of electrical circuits.
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QOUR320
Square D by Schneider Electric QOUR320 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 20A. This MCB is equipped with slotted box lugs connections for both load and line sides, facilitating connections with a cross-section of 14-2AWG for 1 cable Al/Cu. It operates at a rated voltage of 120V to 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the box lugs type, ensuring a secure and reliable connection.
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QOUR315
Square D by Schneider Electric QOUR315 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 15A. 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 to 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the box lugs type, ensuring a secure connection.
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QOUR3105283
Square D by Schneider Electric QOUR3105283 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 10A. This MCB is equipped with slotted ring tongue connections on both the line and load sides, facilitating secure and straightforward wiring. It is compatible with a cross-section of 14-2AWG (1 cable Al/Cu), ensuring versatility in connection options. The QOUR3105283 operates at a rated voltage of 48Vdc and 120V/240V AC, with a short circuit breaking rating of 10kA at 240Vac. The type of terminals used in this MCB is ring tongue, offering a reliable connection point for various applications.
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QOUR310
Square D by Schneider Electric QOUR310 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 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 secure and reliable connections.
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QOUR260
Square D by Schneider Electric QOUR260 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 60A 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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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.
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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
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.
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.
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.