Circuit breakers are essential components in any electrical system. They prevent damage to electrical equipment and reduce the risk of fires by interrupting the flow of current when an overload or short circuit occurs. Without a reliable circuit breaker in place, your electrical system would be vulnerable to serious damage and even catastrophic failure.
An AC miniature circuit breaker (MCB) is a compact, electromechanical device designed to protect electrical circuits from excessive current flow. These breakers automatically disconnect the power supply when the current exceeds a predefined threshold, preventing damage to appliances and reducing the risk of electrical fires.
This standard applies to circuit breakers designed for residential and commercial applications. It covers aspects such as breaking capacity, temperature limits, and mechanical and electrical endurance.
BAD WEATHER POWER TOPROTECT THE FAMILY
To prevent short-circuit explosions, keep people away from danger.
ARC EXTINGUISHING SYSTEMKEEP AWAY FROM FIRE After entering the arcing gate current, it is divided into many series arcs by the electromagnetic effect, which elongates, cools, and goes out.
RED AND GREEN LIGHT VISUALIZATION
Power be clear at a glance to avoid wrong operation
PERFORMANCE GUARANTEE Ice And Firestill Can Normally Use
An MCB consists of four main components:
Main contacts: These contacts form the connection between the input and output sides of the circuit breaker. When the MCB is operational, the contacts remain closed, allowing current to flow through the circuit.
Arc extinguishing chamber: This chamber contains insulating material that helps extinguish the arc formed when the main contacts separate during a fault condition.
Trip mechanism: The trip mechanism senses when the current exceeds the predefined threshold and activates the breaker, disconnecting the main contacts.
Auxiliary contacts: These contacts are used for signaling and interlocking purposes, providing additional safety features to the MCB.
| Model | MDB1-63 |
|---|---|
|
Poles |
1P-4P |
|
Rated Voltage(V) |
230/400V(1P)、400V(2P、3P、4P) |
|
Rated Current(A) |
6.10A.16A.20A.25A.32A.40A.50A.63A |
|
Rated Breaking Capacity(A) |
6000A |
|
Mechanical Life |
20000 |
|
Electrical Life |
10000 |
|
Tripping Characteristics |
B 、 C 、 D |
|
Tightening Torque (n·m) |
2.5 |
|
Protection Class |
IP20 |
|
Standards |
IEC60898 -1、GB/T10963 . 1 |
A: A fuse is a single-use protective device that melts when the current exceeds a specific threshold. A miniature circuit breaker, on the other hand, is a reusable device that automatically trips when the current exceeds the predefined limit.
A: While some miniature circuit breakers are specifically designed for DC applications, most AC MCBs are not suitable for DC circuits due to differences in arc extinction behavior.
A: Most miniature circuit breakers have a visible indicator, such as a colored flag or a toggle switch in the “off” position, showing that the breaker has tripped.
A: The arc extinguishing chamber helps to quickly extinguish the arc formed when the main contacts separate during a fault condition, ensuring a rapid and safe interruption of the current flow.
A: To reset a tripped miniature circuit breaker, first turn off or unplug any devices that might have caused the fault. Then, switch the MCB to the “off” position and finally back to the “on” position. Ensure that the MCB stays in the “on” position, indicating that the issue has been resolved. If the MCB continues to trip, it is essential to investigate the cause further, as there may be a persistent fault or damage in the electrical system.
A: Replacing an miniature circuit breaker with a higher-rated one may seem like a solution to avoid nuisance tripping. However, this practice can be dangerous, as it may compromise the protection of the electrical circuit and connected devices. It is crucial to consult a qualified electrician when considering any changes to the protection settings.
A: The service life of an miniature circuit breaker depends on factors such as the frequency of operation, environmental conditions, and proper maintenance. Typically, MCBs have a mechanical life of around 10,000 to 20,000 operations and an electrical life of 1,000 to 10,000 operations, depending on the manufacturer and model.
A: An miniature circuit breaker can trip for several reasons, including overload, short circuit, or ground fault. Overloads occur when the current exceeds the MCB’s rated capacity for an extended period, while short circuits result from a direct connection between live and neutral conductors. Ground faults happen when current leaks to the ground, creating an imbalance in the circuit.
A: Identifying the cause of a tripped MCB may require a systematic approach. Start by unplugging or turning off all devices connected to the affected circuit. Reset the MCB and observe if it stays in the “on” position. Gradually reconnect the devices, one by one, to identify the problematic appliance or device. If the MCB continues to trip even with all devices disconnected, there may be a fault in the wiring or the MCB itself, requiring the assistance of a qualified electrician.
A: Other circuit protection devices include fuses, residual current devices (RCDS), and molded-case circuit breakers (MCCBs). Each of these devices offers different protection features and is suited for specific applications. While MCBs are ideal for protecting smaller circuits, MCCBs are designed for higher current ratings and more demanding environments. RCDs, on the other hand, provide protection against electrical shocks and ground faults.
Make Electricity Available To All People
Get notified about new products