The General Electric GN240M3XXSFXXXX is an advanced 4000A electronic trip unit belonging to the EntelliGuard L/SL product family. Designed for high-capacity power circuit breakers, this microprocessor-based protective relay provides precise current sensing, customizable protection curves, and reliable fault isolation for critical industrial power distribution systems and heavy commercial switchgear.
Technical Parameters & Datasheet Overview
- Product Model / Catalog Number: GN240M3XXSFXXXX
- Product Series: GE EntelliGuard L/SL Trip Unit Family
- Maximum Current Rating: 4000 Amperes (4000A frame configuration)
- Sensing Technology: True-RMS microprocessor-based current sensing for high measurement accuracy
GE Industrial Solutions
- Protection Types: Long-time (L), Short-time, and Selective/Instantaneous (SL) protection profiles
- Display & Programming: Integrated LCD screen with user-friendly keypad navigation for setting adjustments
GE Industrial Solutions
- Approximate Dimensions: Standard modular form factor designed for seamless integration into GE EntelliGuard circuit breaker front fascias (approx. 220 mm x 140 mm x 90 mm)
- Approximate Weight: Approx. 2.0 kg (4.4 lbs)
- Country of Origin: United States / Global manufacturing standards
- Operating Temperature Range: −20∘C to +70∘C industrial environment standard
Applications
- Heavy Industrial Switchgear: Deployed as the core intelligence and overcurrent protection relay inside main incoming and feeder air circuit breakers.
- Commercial Power Distribution: Protects high-capacity electrical distribution systems in large commercial complexes, data centers, and institutional facilities.
- Generator & Transformer Protection: Integrates into main distribution circuits requiring precise selectivity and coordination to prevent nuisance tripping.
Usage Precautions
- Electrostatic Discharge (ESD): Always utilize a grounded wrist strap and proper ESD mitigation procedures when handling or programming the trip unit module.
- Control Power Verification: Ensure auxiliary control power requirements are met where applicable before attempting software configuration or diagnostic testing.
- Rating Plug Compatibility: Verify that the installed rating plug precisely matches the sensor rating of the specific breaker frame before placing the system back into service.
Parameter Settings & Configuration Methods
- Keypad Navigation: Access protection thresholds, time delays, and pickup settings directly using the integrated front-panel pushbuttons and LCD menu.
- Software Configuration: Parameters can also be reviewed or modified using dedicated GE service tools and testing kits connected via the front diagnostic port.
- Non-Volatile Memory: Configured trip curves and settings are saved securely in onboard memory, protecting configuration integrity during power interruptions.
Manual / Automatic Mode Switching
- Autonomous Protection: Once programmed, the trip unit operates completely autonomously, continuously monitoring line currents in real-time.
- Test and Simulation Modes: Technicians can execute local display checks, battery backups, and secondary-injection testing via the service interface without disrupting primary live circuits.
Emergency Trip Operations
- Direct Breaker Tripping: Upon detecting a sustained overload, short circuit, or user-configured fault threshold crossing, the unit instantly sends an electrical trip signal to the breaker shunt trip mechanism.
- Manual Force Trip: Authorized operators can initiate a direct trip command via system interface menus or designated test routines when performing safety verifications.
Frequently Asked Questions (Q&A)
Q: What does the “L/SL” designation signify on this EntelliGuard unit? A: It indicates that the unit is equipped with Long-time (L) protection alongside Short-time and Selective/Instantaneous (SL) protection options for precise coordination.
Q: Can this trip unit be retrofitted into older GE circuit breakers? A: EntelliGuard units are specifically engineered for the EntelliGuard line of power circuit breakers; check frame compatibility and technical bulletins before attempting swaps.
Q: Does the unit require an external power supply to view settings? A: A handheld test kit or auxiliary 24V DC power source can be plugged into the front port to illuminate the display and review settings when the main breaker is de-energized.
Industry News & Updates
Modern low-voltage power distribution systems increasingly rely on intelligent trip units with advanced metering, event logging, and digital communication capabilities. Upgrading or maintaining breaker protection with genuine microprocessor-based units like the GE EntelliGuard series allows facilities management teams to enhance arc-flash safety, optimize selective coordination, and minimize unplanned electrical downtime.
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