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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 QYU130 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 30A 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 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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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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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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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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Square D by Schneider Electric QOUR240 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, ensuring a secure and reliable connection. It is rated for a current of 40A and can operate at a rated voltage of 120V to 240V AC or 48V DC. The QOUR240 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs as the type of terminals for connection.
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Square D by Schneider Electric QOUR230VH 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 (1 cable Al/Cu). This MCB operates with a rated voltage of 120V to 240V AC and has a 2 Pole configuration. It is capable of a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs.
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Square D by Schneider Electric QOUR225 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 25A 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 QOUR225 operates with a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits. Its terminals are of the box lugs type.
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Square D by Schneider Electric QOUR2155283 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This 2-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 15A and can operate at a rated voltage of 120V or 240V AC, and 48V DC. The short circuit breaking rating of this device is 10kA at 240V AC and 5kA at 48V DC, ensuring protection against significant overcurrents.
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Square D by Schneider Electric QOUR140 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 (1 cable Al/Cu) and is equipped with a single pole. It has 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.
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| Item | Manufacturer | Price | Stock | Delivery | |
|---|---|---|---|---|---|
QYU130 Square D by Schneider Electric QYU130 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. It functions as a unit-mount supplementary protector with a rated current of 30A 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 | |||
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. | Telemecanique Sensors | Quick Quote | |||
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. | Telemecanique Sensors | Quick Quote | |||
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. | Telemecanique Sensors | Quick Quote | |||
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. | Telemecanique Sensors | Quick Quote | |||
QOUR240 Square D by Schneider Electric QOUR240 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, ensuring a secure and reliable connection. It is rated for a current of 40A and can operate at a rated voltage of 120V to 240V AC or 48V DC. The QOUR240 offers a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc, with box lugs as the type of terminals for connection. | Telemecanique Sensors | Quick Quote | |||
QOUR230VH Square D by Schneider Electric QOUR230VH 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 (1 cable Al/Cu). This MCB operates with a rated voltage of 120V to 240V AC and has a 2 Pole configuration. It is capable of a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs. | Telemecanique Sensors | Quick Quote | |||
QOUR225 Square D by Schneider Electric QOUR225 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 25A 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 QOUR225 operates with a rated voltage of 120V and 240V for AC circuits and 48Vdc for DC circuits. Its terminals are of the box lugs type. | Telemecanique Sensors | Quick Quote | |||
QOUR2155283 Square D by Schneider Electric QOUR2155283 is a Miniature Circuit Breaker (MCB) designed for unit mount installation. This 2-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 15A and can operate at a rated voltage of 120V or 240V AC, and 48V DC. The short circuit breaking rating of this device is 10kA at 240V AC and 5kA at 48V DC, ensuring protection against significant overcurrents. | Telemecanique Sensors | Quick Quote | |||
QOUR140 Square D by Schneider Electric QOUR140 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 (1 cable Al/Cu) and is equipped with a single pole. It has 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. | 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.