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YFM2E Series Molded Case Circuit Breakers (Electronic)
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YFM2E-250 Series Intelligent Measuring Switch
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YFM3 Series Molded Case Circuit Breaker
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YFM2LED Electronic Leakage Protection Circuit Breaker
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YFM2LE Residual Current Action Protection Circuit Breaker (Iintelligent type)
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YFM1LE Series Leakage Circuit Breaker
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YFM1 Series Molded Case Circuit Breakers
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Safety and Protection
Low-voltage circuit breakers offer automatic disconnection in case of overload or short circuits, preventing damage and fires.
All three components contribute to a safer electrical environment, protecting both property and individuals. -
Reliability and Stability
Integrated protection functions in circuit breakers, such as leakage and overvoltage protection, enhance the reliability of electrical systems.
Surge protectors improve the stability of critical equipment and systems by reducing the impact of voltage fluctuations. -
Efficiency and Energy Conservation
Prompt disconnection of overloaded circuits by circuit breakers helps in saving energy and reducing waste.
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Maintenance and Cost Reduction
The ease of maintenance of low-voltage circuit breakers reduces service costs and downtime.
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What are the primary functions of an MCCB?
MCCBs provide overload protection, short-circuit protection, ground fault protection (in some models), isolation functionality, and current-limiting interruption capability. They automatically cut off the circuit when current exceeds preset values to protect electrical equipment and personnel safety.
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What are the main components of an MCCB?
An MCCB consists of a housing, operating mechanism, arc extinguishing system, and tripping devices (thermal or magnetic tripping units).
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What are the short-circuit protection characteristics of an MCCB?
MCCBs offer long-time delay, short-time delay, and instantaneous tripping characteristics for short-circuit protection, with adjustable delay settings. The tripping multiples can be adjusted across a wide range to accommodate varying actual fault currents in different circuits.
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What are the typical applications of MCCBs?
MCCBs are commonly used in heavy-duty applications such as adjustable tripping settings for low-current circuits, motor protection, capacitor bank protection, welding machine protection, generator protection, and feeder circuits. They also serve as terminal or branch switches in distribution systems, replacing traditional fuses and knife switches.
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What are common MCCB failures and how to troubleshoot them?
Common failures include overloading, short circuits, ground faults, contact erosion, arc chamber leakage, and loose tripping mechanisms.
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How do I select the right MCCB?
Choose an MCCB based on specific operating conditions, circuit rated current, and protection requirements. For example, select MCCBs when the rated current is below 630A and the short-circuit current is moderate. Consider factors like breaking capacity, protection characteristics, and operating mode. Ensure the breaker’s rated current and voltage meet or exceed the circuit’s actual values.
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What are the rated current and voltage ranges for MCCBs?
MCCBs typically have rated currents ranging from 15A to 1600A, with rated voltages varying by model and application. Always select an MCCB with rated current and voltage equal to or greater than the circuit’s actual requirements.
