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General| Brand | Fuji Electric |
|---|---|
| Model | EW50EAG |
| Category | Circuit breakers |
| Language | English |
Overview of common low-voltage circuit faults and protection measures.
Details on overload and short-circuit protection principles for MCCBs.
Explains phase-loss faults and protection methods for three-phase circuits.
Discusses types of overcurrent tripping and factors affecting them.
Covers short-circuit current breaking, capacity, and let-through values.
Details overload switching test conditions and performance criteria.
Examines temperature rise and internal resistance at rated current.
Discusses switching durability and trip switching durability requirements.
Covers rated power frequency and impulse withstand voltage tests.
Presents operating force and angle data for various breaker types.
Lists key factors for selecting MCCBs, including system, load, and characteristics.
Explains conditions and criteria for cascade (backup) trip coordination systems.
Details selective trip coordination between breakers and with high-voltage fuses.
Covers protection of wiring against overcurrents based on thermal characteristics.
Discusses protection for motors considering starting currents and coordination.
Addresses inrush current for transformer excitation and MCCB selection.
Explains considerations for arc and resistance welder circuits, including thermal equivalent current.
Covers arc reignition and transient inrush current issues in capacitor circuits.
Discusses faults and overcurrents in thyristor converters and protection methods.
Provides combinations of MCCBs/MMSs and fuses for SSC protection.
Details MCCB selection for protecting inverter circuits and UPS applications.
Explains why hydraulic-magnetic and solid-state trip MCCBs are unsuitable for 400Hz.
Discusses operating characteristics and selection of MCCBs for DC circuits.
Guides MCCB selection for UPS systems, considering overload withstand.
Lists MCCB types suitable for servo amplifier applications.
Explains grounding methods and ground fault protection in low-voltage systems.
Lists standard operating and storage conditions for FUJI MCCB performance.
Covers precautions for high-temperature, cold climate, and high altitude applications.
Provides guidance on reversed connections and tightening torque for conductors.
Explains how to prevent MCCB malfunction from transient inrush currents.
Details common MCCB faults, their causes, and corresponding countermeasures.
Outlines initial inspection criteria and periodic inspection standards for MCCBs.
Provides guidelines for MCCB deterioration diagnosis and replacement based on durability.
Explains the objective, formulas, and examples for calculating short-circuit current.
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