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Air Circuit Breakers trip under various circumstances to protect electrical systems from damage and ensure safety. They trip when the current flowing through the circuit exceeds the rated capacity for an extended period, known as overload. ACB stands for Air Circuit Breaker. This type of circuit breaker protects electrical circuits from overloads, short circuits, and other faults by interrupting the flow of electrical current in the event of a fault condition. ACBs are widely used in low-voltage (LV) and medium-voltage (MV) electrical distribution systems. It ensures the safety and reliability of the electrical infrastructure in industrial plants, commercial buildings, power distribution substations, and other facilities. They provide essential protection against electrical faults, ensuring the safety of personnel and equipment and minimizing downtime due to electrical failures.

Air Circuit Breakers Trip
Short circuit fault

•   Short circuit between live and neutral phases
•   Winding insulation breakdown

Faulty components

•   Overheating
•   Mechanical wear
•   Damaged contacts

Overload  fault

•  Inappropriate size ACB
•  Other devices drawing current from the same panel
•  Transient switching action

  Earth fault

•   Failure of earthing
•   Sudden change in load
•   Contact between live conductor and outer surface

  Improper SR setting

•    Defective internal wiring
•    Improper manual handling

Environmental factors

•   Humidity/ dust
•   Corrosive atmosphere
•   High temperature

Miscellaneous

•   Electromagnetic pulses
•   Radio frequency interference
•   Electromagnetic interference
•   Software/ firmware issues

Who should use the Air Circuit Breakers Trip template?

• This RCA fishbone diagram is helpful for maintenance, operations, engineering, quality assurance, and management decision-makers involved in electrical distribution system design, maintenance, and daily operations to maintain product quality.

Why use this template?

• Maintenance, operations, engineering, quality assurance, and management decision-makers involved in electrical distribution system design, maintenance, and daily operations find this RCA fishbone helpful for maintaining product quality.
• Craft your template or reuse this with some modification for cause analysis of other problems in ProSolvr by smartQED.

Curated from community experience and public sources:

• https://ijireeice.com/wp-content/uploads/2019/03/IJIREEICE.2019.7202.pdf
• https://elcb.net/circuit-breaker-keeps-tripping-5-possible-reasons/