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Miniature Circuit Breakers (MCBs)
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QOUQ345
Square D by Schneider Electric QOUQ345 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 45A. This MCB is equipped with slotted box lugs connections for both load and line sides, facilitating straightforward installation. It is compatible with a wire cross-section of 14-2AWG (1 cable Al/Cu), ensuring versatility in connection options. The QOUQ345 operates effectively at a rated voltage of 120V or 240V AC and can also function at 48V DC. Its short circuit breaking rating is established at 10kA for 240V AC operations and 5kA for 48V DC, with box lugs serving as the type of terminals.
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QOUQ350
Square D by Schneider Electric QOUQ350 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 50A. 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 for AC circuits, and 48Vdc for DC circuits. The QOUQ350 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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QOUQ360
Square D by Schneider Electric QOUQ360 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 60A. 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 of the box lugs type.
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QOUQ325
Square D by Schneider Electric QOUQ325 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 25A. 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 QOUQ325 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs type terminals for secure connections.
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QOUQ260
Square D by Schneider Electric QOUQ260 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 (1 cable Al/Cu) and is equipped with 2 poles. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The rated voltage for AC operation is 120V and 240V, while for DC operation, it is rated at 48Vdc. The terminals are of the box lugs type.
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QOUQ250
Square D by Schneider Electric QOUQ250 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 a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. It supports a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits. The QOUQ250 is equipped with slotted box lugs connections on both the load and line sides for secure attachment, and it utilizes box lugs as its type of terminals.
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QOUQ235
Square D by Schneider Electric QOUQ235 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 has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The rated voltage for AC operation is 120V and 240V, while for DC operation, it is rated at 48Vdc. The terminals are of the box lugs type.
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QOUQ240
Square D by Schneider Electric QOUQ240 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 40A 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 operates with a 2 pole configuration. It has a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits. The QOUQ240 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs type terminals for secure connections.
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QOUQ230
Square D by Schneider Electric QOUQ230 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 30A and accommodates slotted box lugs connections on both the load and line side. This MCB is compatible with a cross-section of 14-2AWG for one aluminum or copper cable and operates with a 2 pole configuration. It has a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits. The QOUQ230 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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QOUQ215
Square D by Schneider Electric QOUQ215 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 15A 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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QOU3901042
Square D by Schneider Electric QOU3901042 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for a current of 90A and accommodates slotted box lugs connections on both the load and line sides. It supports a cross-section of 12-2/0AWG for one cable, either aluminum or copper. The QOU3901042 is a 3-pole device, compatible with control voltages ranging from 12Vdc to 24Vdc. It is designed to operate at a rated voltage of 60Vdc in DC circuits and 120V or 240V in AC circuits. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 60Vdc, with box lugs as the type of terminals.
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QOU390
Square D by Schneider Electric QOU390 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 90A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG for one aluminum or copper cable. It operates at a rated voltage of 120V and 240V for AC circuits and 60Vdc for DC circuits. The QOU390 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 60Vdc, with box lugs as the type of terminals.
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QOU3901021
Square D by Schneider Electric QOU3901021 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for a current of 90A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a wire cross-section of 12-2/0AWG for one aluminum or copper cable. The QOU3901021 is a 3-pole device, supporting a rated voltage of 60Vdc and AC voltages of 120V and 240V. It operates within a control voltage range of 120Vac to 208Vac. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 60Vdc, with box lugs as the type of terminals.
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QOU3801042
Square D by Schneider Electric QOU3801042 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping. This MCB is rated for 80A and is compatible with slotted box lugs connections on both the load and line sides. It supports a cross-section of 12-2/0AWG for one cable, whether aluminum or copper. The QOU3801042 is a 3-pole device, ensuring multi-phase protection. It operates at a rated voltage of 120V and 240V for AC circuits and 60Vdc for DC circuits, with a control voltage range of 12Vdc to 24Vdc. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 60Vdc, with box lugs as the type of terminals.
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QOU3807100
Square D by Schneider Electric QOU3807100 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 80A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG (1 cable Al/Cu). It operates at a rated voltage of 120V to 240V AC and 60V DC. The QOU3807100 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 60Vdc, with box lugs as the type of terminals.
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QOU380
Square D by Schneider Electric QOU380 is a unit-mount Miniature Circuit Breaker (MCB) designed for both AC and DC applications. It features a 3-pole configuration and is capable of handling a rated current of 80A. The QOU380 offers slotted box lugs connections on both the load and line sides, accommodating a cross-section of 12-2/0AWG(1 cable Al/Cu). It operates at a rated voltage of 120V and 240V for AC, and 60Vdc for DC applications. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 60Vdc, ensuring protection against overcurrents. The terminals are designed as box lugs, facilitating secure and reliable connections.
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QOU3707100
Square D by Schneider Electric QOU3707100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 3-pole configuration and is rated for a current of 70A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG (1 cable Al/Cu). It operates at a rated voltage of 60Vdc and 120V/240V AC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the box lugs type.
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QOU3701042
Square D by Schneider Electric QOU3701042 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for a current of 70A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a cross-section of 12-2/0AWG(1 cable Al/Cu) and is a 3-pole device. The QOU3701042 supports a rated voltage of 60Vdc in DC applications and 120V to 240V in AC applications. Its control voltage ranges from 12Vdc to 24Vdc. The short circuit breaking rating is specified at 10kA for 240Vac and 5kA for 48Vdc, with box lugs as the type of terminals.
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QOU3701021
Square D by Schneider Electric QOU3701021 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for a current of 70A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a cross-section of 12-2/0AWG(1 cable Al/Cu) and is a 3 Pole device. The QOU3701021 supports a rated voltage of 60Vdc in DC applications and 120V to 240V in AC applications. Its control voltage ranges from 120Vac to 208Vac. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, with box lugs as the type of terminals.
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QOU370
Square D by Schneider Electric QOU370 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a 3-pole configuration and is rated for a current of 70A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 12-2/0AWG (1 cable Al/Cu). It operates at a rated voltage of 60Vdc and 120V/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are of the box lugs type.
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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.