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Miniature Circuit Breakers (MCBs)
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QOU330VH
Square D by Schneider Electric QOU330VH is a unit-mount Miniature Circuit Breaker (MCB) designed for a rated current of 30A. It features slotted box lugs connections on both the load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. This 3-pole MCB operates at a rated voltage of 120V to 240V AC and has a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are of the box lugs type, facilitating secure and straightforward installation.
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QOU3301042
Square D by Schneider Electric QOU3301042 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 30A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a cross-section of 14-2AWG for one cable, either aluminum or copper. The QOU3301042 operates with a rated voltage of 48Vdc in DC applications and 120V to 240V in AC applications. It is a 3-pole breaker with a control voltage range of 12Vdc to 24Vdc. The short circuit breaking rating stands at 10kA for 240Vac and 5kA for 48Vdc, featuring box lugs type terminals for secure connections.
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QOU3305283
Square D by Schneider Electric QOU3305283 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 30A. This MCB is equipped with ring tongue connections on both the load and line sides, facilitating secure and straightforward installation. It operates effectively at a rated voltage of 120V or 240V AC and 48V DC. The QOU3305283 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, ensuring protection against overcurrents. Its terminals are also designed to accommodate ring tongue connectors, enhancing the reliability of connections.
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QOU3301200
Square D by Schneider Electric QOU3301200 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 30A 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 with a 3 Pole configuration and includes 1 Normally Open (NO) auxiliary contact. The QOU3301200 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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QOU3301021
Square D by Schneider Electric QOU3301021 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 a current of 30A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a cross-section of 14-2AWG for 1 cable Al/Cu. The QOU3301021 is a 3 Pole device, ensuring multi-phase protection. It operates at a rated voltage of 48Vdc and 120V/240V AC, with a control voltage range of 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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QOU330
Square D by Schneider Electric QOU330 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 30A. 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, and also at 48V DC. The QOU330 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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QOU325VH5283
Square D by Schneider Electric QOU325VH5283 is a unit-mount Miniature Circuit Breaker (MCB) designed for a rated current of 25A. It features slotted ring tongue connections on both the line and load sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. This 3-pole MCB is rated for voltages of 120V and 240V AC, with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are of the ring tongue type, ensuring secure and reliable connections.
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QOU3255283
Square D by Schneider Electric QOU3255283 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This three-pole MCB features ring tongue connections on both the load and line sides, facilitating secure and straightforward wiring. It is rated for a current of 25A and can operate at a rated voltage of 120V or 240V AC, and 48V DC. The QOU3255283 offers a short circuit breaking rating of 10kA at 240V AC and 5kA at 48V DC, ensuring protection against overcurrents in a variety of electrical circuits.
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QOU3251021
Square D by Schneider Electric QOU3251021 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 a current of 25A and accommodates slotted box lugs connections on both the load and line sides. It is compatible with a cross-section of 14-2AWG for 1 cable Al/Cu. The QOU3251021 supports a 3-pole configuration and operates at a rated voltage of 48Vdc and 120V/240V AC. Its control voltage ranges between 120Vac and 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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QOU3251200
Square D by Schneider Electric QOU3251200 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 25A 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 with a 3 Pole configuration and includes 1 Normally Open (NO) auxiliary contact. The QOU3251200 is rated for 48Vdc and 120V/240V AC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs.
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QOU325
Square D by Schneider Electric QOU325 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. 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 (1 cable Al/Cu). It operates at a rated voltage of 120V and 240V for AC systems and 48Vdc for DC systems. The QOU325 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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QOU320VH
Square D by Schneider Electric QOU320VH 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 secure and straightforward installation. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU320VH operates at a rated voltage of 120V to 240V AC and offers a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. Its terminals are of the box lugs type, ensuring a reliable connection.
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QOU3205283
Square D by Schneider Electric QOU3205283 is a unit-mount Miniature Circuit Breaker (MCB) designed for use in various applications requiring circuit protection. This MCB features a 3-pole configuration and is capable of handling a rated current of 20A. It offers ring tongue connections for both load and line sides, ensuring secure and reliable connections. The QOU3205283 is rated for use with 48Vdc and 120/240Vac systems, providing versatility in both DC and AC applications. It has a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, which helps to safeguard against overcurrent conditions. The terminals are designed to accommodate ring tongue connectors, facilitating easy installation and maintenance.
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QOU3203100
Square D by Schneider Electric QOU3203100 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. 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, accommodating a cross-section of 14-2AWG (1 cable Al/Cu). It operates at 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 box lugs type, ensuring a secure connection.
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QOU3202100
Square D by Schneider Electric QOU3202100 is a miniature circuit breaker (MCB) designed for unit mount installation. It features an alarm/fault trip signalling switch, enhancing its functionality. This 3-pole MCB is rated for 20A and accommodates connections via slotted box lugs on both the load and line sides. It is compatible with a wire cross-section of 14-2AWG for both aluminum and copper cables. The QOU3202100 is designed to operate at a rated voltage of 120V or 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are box lug type, facilitating secure and reliable connections.
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QOU315VH
Square D by Schneider Electric QOU315VH 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 15A with a rated voltage of 240V AC. The connection is facilitated through slotted box lugs connections on both the load and line sides, accommodating a cross-section of 14-2AWG for 1 cable Al/Cu. This MCB boasts a short circuit breaking rating of 22kA 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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QOU31007100
Square D by Schneider Electric QOU31007100 is a miniature circuit breaker (MCB) designed for unit mount installation. This 3-pole MCB features slotted box lugs connections on both the load and line sides, accommodating a cross-section of 12-2/0AWG(1 cable Al/Cu). It is rated for a current of 100A and offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 60Vdc. The QOU31007100 operates at a rated voltage of 120V and 240V for AC, and 60Vdc for DC applications. Its terminals are of the box lugs type.
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QOU31001200
Square D by Schneider Electric QOU31001200 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It features an auxiliary switch with 1a, suitable for applications requiring a 100A 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 QOU31001200 is capable of handling rated voltages of 60Vdc and 120V/240Vac, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 60Vdc. Its terminals are designed as box lugs.
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QOU2901021
Square D by Schneider Electric QOU2901021 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 QOU2901021 is a 2-pole device, compatible with rated voltages of 60Vdc and 120V/240Vac. Its control voltage ranges from 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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QOU225VH
Square D by Schneider Electric QOU225VH is a unit-mount Miniature Circuit Breaker (MCB) designed for securing electrical circuits. It features a 2-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, facilitating connections with a cross-section of 14-2AWG for one aluminum or copper cable. It operates effectively at a rated voltage of 120V to 240V AC, and it has a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, ensuring a secure and reliable connection.
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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.