1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the Schneider Electric MJL36800 Molded Case Circuit Breaker. This device is designed to protect electrical circuits from overcurrents, including overloads and short circuits, in commercial and industrial applications. Please read this manual thoroughly before attempting any procedures.
2. Safety Information
WARNING: Risk of electric shock, explosion, or arc flash.
- Installation, maintenance, and repair of this equipment must be performed by qualified personnel only.
- Always de-energize the equipment and follow proper lockout/tagout procedures before working on or near the circuit breaker.
- Use appropriate personal protective equipment (PPE) as required by local safety regulations.
- Never operate the circuit breaker with damaged components.
- Ensure all connections are properly torqued to prevent overheating and potential fire hazards.
3. Product Overview
The Schneider Electric MJL36800 is an 800-Amp, 600-Volt molded case circuit breaker. It features a robust design for reliable circuit protection. The main operating handle indicates the breaker's status (ON/OFF/TRIPPED).
4. Setup and Installation
Installation of the MJL36800 circuit breaker requires adherence to all national and local electrical codes. Ensure the mounting surface is stable and capable of supporting the breaker's weight (approximately 111 pounds).
4.1 Mounting
Securely mount the circuit breaker in its intended enclosure or panel using appropriate hardware. Refer to the specific enclosure instructions for proper mounting orientation and clearances.
4.2 Wiring Connections
Connect the electrical conductors to the breaker terminals. The MJL36800 is designed for use with Copper (Cu) or Aluminum (Al) conductors. Refer to the specifications for appropriate wire sizes and torque values.
- Conductor Range: #3/0 AWG to 500 kcmil (95-240 mm²)
- Terminal Torque: 450 lb-in (50 N-m)
Ensure all connections are clean, tight, and free from insulation interference. Double-check all wiring against the system's electrical schematics.
5. Operating Instructions
The circuit breaker's handle indicates its operational status.
- ON Position: The handle is fully up, indicating the circuit is closed and power is flowing.
- OFF Position: The handle is fully down, indicating the circuit is open and power is interrupted.
- TRIPPED Position: The handle is in an intermediate position (between ON and OFF), indicating an overcurrent condition has occurred and the breaker has automatically opened the circuit.
5.1 Turning ON/OFF
- To turn the breaker OFF, push the handle firmly down to the 'OFF' position.
- To turn the breaker ON, push the handle firmly up to the 'ON' position.
5.2 Resetting a Tripped Breaker
If the breaker trips, it indicates an electrical fault. Before resetting, investigate and resolve the cause of the trip.
- Move the handle fully to the 'OFF' position. This resets the internal tripping mechanism.
- Push the handle firmly up to the 'ON' position.
- If the breaker immediately trips again, do not attempt to reset it further. Contact qualified electrical personnel to diagnose and repair the fault.
6. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of the circuit breaker. All maintenance should be performed by qualified personnel.
- Visual Inspection: Periodically inspect the breaker for any signs of physical damage, discoloration, loose connections, or excessive dust accumulation.
- Cleaning: Keep the breaker and its surroundings clean and free of dust and debris. Use a dry, lint-free cloth for cleaning. Do not use solvents or abrasive cleaners.
- Connection Checks: Periodically verify that all electrical connections are tight and torqued to the specified values.
7. Troubleshooting
This section addresses common issues that may arise with the circuit breaker.
- Breaker Trips Frequently: This indicates a persistent overcurrent or short-circuit condition in the protected circuit. Do not repeatedly reset the breaker without investigating the cause. Possible causes include overloaded circuits, faulty equipment, or wiring issues.
- Breaker Does Not Reset: If the breaker handle does not stay in the 'ON' position after being moved to 'OFF' and then 'ON', there may still be a fault present, or the breaker itself could be damaged. Do not force the handle.
- Overheating: Signs of overheating (discoloration, melting, burning smell) around the breaker or its terminals indicate a serious problem, possibly loose connections or an overloaded circuit. Immediately de-energize the circuit and have it inspected by qualified personnel.
8. Specifications
| Feature | Specification |
|---|---|
| Brand | Schneider Electric |
| Model Number | MJL36800 |
| Current Rating | 800 Amps |
| Voltage Rating | 600 Volts |
| Number of Poles | 1 |
| Circuit Breaker Type | Standard, Molded Case |
| Material | Copper (terminals) |
| Item Weight | 111 pounds |
| Product Dimensions | 54.6 x 22.8 x 14.2 inches |
| UPC | 785901655398 |
| Country of Origin | China |
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact Schneider Electric directly or visit their official website. Keep your purchase receipt and product details handy when contacting support.
Schneider Electric Customer Support: For assistance, please refer to the contact information provided on the official Schneider Electric website or product packaging.
