Eaton LGU3500FAG

The LGU3500FAG is part of Eaton‘s Series G Molded-Case Circuit Breakers (MCCB), designed to provide overload and short-circuit protection for industrial electrical systems such as distribution cabinets and control panels. This three-pole fixed thermal-magnetic model adopts a standardized modular structure, facilitating on-site assembly and maintenance.

Key Technical Specifications

• Rated Current: 350 A (optional 300 A, 360 A, and other series)
• Pole Configuration: Three-pole (four-pole optional)
• Pole Spacing: 35 mm (standard IEC)
• Rated Voltage: 600 V AC (suitable for low-voltage distribution)
• Ultimate Short-Circuit Breaking Capacity: 25 kA (ICU)
• Trip Characteristic: Fixed thermal-magnetic. Adjustable thermal trip range: 0.5–1.5 × rated current. Magnetic trip: non-adjustable.
• Dimensions: Width 140 mm × Height 140 mm × Depth 210 mm (standard size)
• Weight: Approximately 12 kg (varies by pole configuration)
• Wiring Method: Screw terminals, compatible with 35 mm terminal blocks
• Compliance Standards: IEC 60947-2, UL 489, EN 60947-2, and other international safety standards

Product Features

• High Reliability: Heat and corrosion-resistant molded case enables long-term operation in harsh industrial environments.
• Fast Disconnection: Magnetic trip completes short-circuit interruption within 10 ms, protecting downstream equipment from inrush current damage.
• Adjustable Thermal Trip: Thermal trip setting range covers 0.5–1.5 × rated current, allowing precise adjustment based on load characteristics.
• Modular Structure: Internal components (thermal trip, magnetic trip, contacts) are standardized modules, enabling easy on-site replacement and maintenance.
• Multiple Pole Options: Three-pole and four-pole versions available to meet single-phase, three-phase, and neutral line protection needs.
• International Standard Compliance: Certified by IEC, UL, EN, etc., meeting unified technical requirements for global markets.

Structure and Composition

• Enclosure: High-strength molded case providing dust and moisture protection.
• Contact Assembly: Copper alloy contacts with excellent electrical conductivity and wear resistance.
• Thermal Trip Mechanism: Bimetallic thermal element, with trip current adjustable via set screws.
• Magnetic Trip Mechanism: Combination of electromagnetic coil and movable iron core for instantaneous short-circuit interruption.
• Terminal Blocks: 35 mm screw terminals supporting parallel connection of multiple wires.
• Operating Handle: Manual ON/OFF operation, equipped with indicator lights to show breaker status.

Typical Application Areas

• Industrial Distribution Cabinets: Provide overload and short-circuit protection for large loads such as motors, frequency converters, and pump stations.
• Building Automation: Cooperate with control systems like PLCs and frequency converters to achieve safe and reliable power distribution.
• Energy Facilities: Protection devices for the low-voltage side of generators and substations.
• Petrochemical Industry: Protect high-power electrical equipment, meeting explosion-proof and dust-proof requirements (when used with corresponding explosion-proof enclosures).
• Transportation Facilities: Power distribution systems for rail transit such as subways and light rail.

Installation and Maintenance Guidelines

• Pre-installation Inspection: Confirm that rated current and pole configuration match system requirements. Check for no enclosure damage and intact terminal block threads.
• Wiring: Use 35 mm screw terminals. Ensure wire stripping length complies with specifications. Tighten screws to the specified torque (approximately 1.5 Nm) to prevent poor contact due to loosening.
• Thermal Trip Setting: Adjust using the included set screws based on load rated current. Initial setting at 0.8 × rated current is recommended, followed by fine-tuning through on-site commissioning.
• Magnetic Trip Verification: Use a short-circuit tester to verify magnetic trip operation time (≤10 ms) at currents above 10 kA, ensuring compliance with technical documentation.
• Regular Inspection: Conduct visual inspection, terminal tightness check, and handle operation flexibility check every 12 months. Measure thermal trip resistance to confirm no aging.
• Replacement and Maintenance: The internal modular design allows direct on-site replacement of thermal trip or magnetic trip units without replacing the entire device. Re-setting and functional testing are required after replacement.

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