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Product Training Product Safety Product Guides Product News Featured ProductsSquare D PowerPacT M-Series contains M-Frame circuit breakers able to handle up to 800A molded case circuit breakers and 600V industrial circuit protection. These high-amperage circuit breakers make sure Square D’s M-Frame breakers give dependable protection for industrial applications, reducing downtime and improving electrical safety.
M-Frame Series Features of 800 Amp, 600-Volt Breakers
Electronic trip units: Not all M-Frame circuit breakers are equal. The Square D PowerPacT M-Series Circuit Breaker manual shows the breakers’ advanced capabilities, like electronic trip units that give precise and reliable tripping. This guarantees your electrical system is safely protected.
Fixed trip units: The PowerPacT M-Series Circuit Breaker series is designed to fit a broad range of industrial and commercial power protection requirements. An important component is the fixed trip units, that are available in 400 and 600 A. These breakers provide continuous protection for situations where the current load is stable, leading to dependable operation with little modifications necessary.
Adjustable trip units: These units provide more versatility in areas with fluctuating electrical demands. These molded case circuit breakers, which range from 300 A to 800 A, allow users to fine-tune the protection settings based on system requirements, reducing bothersome trips while delivering maximum safety.
Mounting: When it comes to installation, PowerPacT M-Series Circuit Breakers come in both unit-mount and I-Line versions. The unit-mount design is good for standalone installations, and the I-Line version integrates seamlessly into Square D I-Line panelboards, so installation is faster and more efficient.
2 and 3-Pole Breakers: For more choices, PowerPacT M-Series Circuit Breakers come in two- and three-pole configurations. 2-pole breakers are good for single-phase systems or smaller three-phase loads, and 3-pole breakers provide full protection in three-phase power systems, commonly found in industrial and large commercial applications.
600A current rating and a 600VAC voltage rating for industrial applications. Interrupting capacity of 25kA, for handling fault conditions.
If you choose the right spec such as PowerPactT breaker frame size, you get optimized system protection, reduced energy waste, and increased efficiency.
Choosing the Right PowerPacT Breaker
| Unit-Mount, Manually Operated Breakers (Standard Electronic Trip) | I-Line, Manually Operated Breakers |
|---|---|
| 400A: MGL26400 (2-pole), MGL36400 (3-pole) | 400A: MGA36600 (3-pole) |
| 600A: MGL26600 (2-pole), MGL36600 (3-pole) | 800A: MGA36600LC (3-pole) |
| 800A: MGL2680010 (2-pole), MGL36800E10 (3-pole) | 800A: MGA268002 (2-pole) |
Understanding the specifications of Square D’s 800A M-Frame breakers ensures you choose a breaker that fits your system seamlessly, avoiding compatibility issues and costly delays.
Comparing M-Frame Circuit Breakers Rated up to 800A and 600VAC
Different applications require different interrupting ratings. PowerPacT M-Series Circuit Breakers are available in MG Type and MJ Type configurations with the following ratings:
| MG Type | MJ Type |
|---|---|
| 240V: 65 kA | 240V: 100 kA |
| 480V: 35 kA | 480V: 65 kA |
| 600V: 18 kA | 600V: 25 kA |
Termination Options for PowerPacT Breakers
Flexibility, maintenance, and long-term dependability when installing your PowerPacT breaker are all determined by how it connects to your system. Several termination choices are described in the Square D PowerPacT breaker manual to meet different setups.
- F (No Lugs) – This option works when custom lugs or direct bus connections are needed, giving you system design flexibility.
- A (I-Line) – For quick installation into I-Line panelboards, saving time and reducing labor costs.
- L (Lugs on Both Ends) – Standard lugs on both ends for basic wiring connections and easy installation.
- M (Lugs on ON End, Terminal Nut Kit on OFF End) – Gives a combination of pre-installed lugs so you can customize connections.
- P (Lugs on OFF End, Terminal Nut Kit on ON End) – Like the “M” option but reversed, providing an adjustable wiring solution.
By selecting the right termination, you get a secure electrical connection, simplified installation and system reliability over time.
Accessories for Square D PowerPacT Circuit Breakers
Upgrading your Square D PowerPacT circuit breaker with accessories improves performance.
Electrical Accessories
Shunt trip devices for remote tripping
Undervoltage trip devices for added protection
Auxiliary and alarm switches for monitoring breaker status
Mechanical Accessories
Lug types (standard, compression, power distribution)
Key-lock devices for security
OSHA-compliant padlocking devices
Accessories offer more control, monitoring capabilities, and system security for high-amperage circuit breakers.
Quick Reference: PowerPacT Breakers Explained
- Square D PowerPacT Breaker – A brand of circuit breakers for reliable circuit protection in industrial applications, available in multiple frame sizes and trip configurations.
- M-Frame Circuit Breakers – A classification within the PowerPacT breaker series for medium to large electrical loads, rated up to 800A molded case circuit breakers.
- High-Amperage Circuit Breakers – Circuit breakers for managing large electrical currents, protecting electrical systems from overloads and short circuits in heavy-duty situations.
- Interrupting Rating – Highest fault current a circuit breaker can safely interrupt without damage. Higher interrupting ratings are important for systems with a lot of short-circuit potential.
- Shunt Trip Device – Remotely controlled accessory so a PowerPacT breaker can trip (turn off) through an external electrical signal. Used in emergency shutdowns or automation systems.
- Termination Options – Connection designs for PowerPacT circuit breakers, including I-Line, standard lugs, and terminal nut kits, for installation and compatibility.
- Fixed Trip Unit – An electronic trip unit in a PowerPacT breaker with a predetermined amperage setting. This means it can’t be adjusted after installation.
- Adjustable Trip Unit – A customizable trip unit in a molded case circuit breaker that lets users change trip settings within a range, adding flexibility in system protection.
- I-Line Breaker – A type of PowerPacT circuit breaker designed for Square D I-Line panelboards, giving you quicker installation and maintenance.
- Auxiliary Switch – Accessory for remote indication of the breaker’s ON/OFF status for automation and monitoring systems.
- Undervoltage Trip Device – Accessory for tripping a PowerPacT breaker when voltage drops below a specific threshold, avoiding equipment damage during power fluctuations.
- Alarm Switch (Bell Alarm) – Switch for activating an alarm signal when a PowerPacT breaker trips during an overload or fault condition, supporting system monitoring.
- Overcurrent Protection – A basic PowerPacT circuit breaker function for preventing excess current that can overheat conductors and cause electrical fires.
- Thermal-Magnetic Trip Unit – A trip unit in older circuit breakers that uses a bimetallic strip (thermal) for overloads and an electromagnet (magnetic) for short circuits. Unlike electronic trip units, these can be affected by ambient temperature.
- Electronic Trip Unit – A modern, precision-based trip mechanism used in M-Frame circuit breakers, giving more accuracy, temperature-independent operation, and advanced protection settings.
- Short-Circuit Current Rating (SCCR) – The highest fault current a device like PowerPacT circuit breaker can safely handle without damage. This rating helps system components interrupt short-circuit conditions.
- Trip Unit – The internal component of a molded case circuit breaker responsible for detecting overcurrent conditions and triggering the breaker to open. Electronic trip units offer more precise protection compared to thermal-magnetic trip units.
- Overcurrent Trip Switch (SDE) – A safety feature in Square D PowerPacT breakers that automatically trips the breaker when it detects extra current, reducing electrical faults.
- Bus Connector Kit – Hardware component that connects M-Frame circuit breakers to electrical busbars in panelboards or switchgear, supporting secure and efficient power distribution.
- Padlocking Device – Mechanical accessory so the PowerPacT circuit breaker toggle can be locked in the OFF position. This means equipment cannot be re-energized during maintenance, meeting OSHA safety rules.