Rated for 800A at 600VAC, the Square D MGP36800 provides advanced protection for industrial facilities. This M-Frame breaker ensures consistent performance in demanding environments. Featuring a unit-mount configuration, it installs into QED switchboards and Model 6 Motor Control Centers. It crosses over to the PGL36080U31A P-Frame replacement. Delivering 35kAIC at 480V, it is equipped with an ET 1.0 electronic trip unit (LI) and an 80% continuous current rating.
What legacy Square D circuit breakers does the MGP36800 replace?
The PowerPacT M-frame MGP36800 is designed to replace older Square D MA and MH frame circuit breakers. It provides a smaller installed footprint and upgraded electronic trip accuracy compared to traditional thermal-magnetic models.
Can the MGP36800 be installed directly onto an I-Line bus?
No, the MGP36800 is a unit-mount breaker with lug connections on both the line and load sides. For direct plug-on I-Line bus mounting, an MGA frame breaker is required. However, the MGP36800 can be installed as a main breaker in I-Line panelboards (HCP, HCN, HCM) when properly unit-mounted.
Is the MGP36800 rated for 100 percent continuous operation?
No, this breaker carries a standard 80 percent continuous current rating. Continuous loads lasting three hours or more must not exceed 640 amps, which is 80 percent of its 800A nominal rating.
How is the ET 1.0 electronic trip unit on the MGP36800 adjusted?
The ET 1.0 trip unit features fixed Long-Time (thermal) protection and an adjustable Instantaneous (magnetic) trip. The instantaneous pickup can be adjusted from 2 to 10 times the 800A nominal rating to coordinate with downstream devices.
Are the internal accessories for the MGP36800 interchangeable with other PowerPacT frames?
Yes, the M-frame shares common internal electrical accessories, such as shunt trips, undervoltage releases, and auxiliary switches, with Square D PowerPacT P-frame circuit breakers.
Can the electronic trip unit on the MGP36800 be swapped or upgraded in the field?
No, the basic ET 1.0 electronic trip unit is factory-installed and cannot be field-replaced or upgraded. If advanced metering or communication features are required, a different breaker series with a MicroLogic trip unit must be specified.
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