Square D PGA36100U31A Circuit Breaker

This breaker installs into Square D I-Line panelboards and switchboards designed for PowerPacT P-frame units. It requires 9 inches of available I-Line bus space for mounting.

Under the Square D "G" interrupting tier, this breaker provides an 18 kA interrupting rating at 600VAC. It is also rated for 35 kA at 480VAC and 65 kA at 240VAC.

The factory load-side lugs on this 1000A breaker can accommodate up to four conductors per phase. The accepted wire range is 3/0 AWG to 500 kcmil for both aluminum and copper wire.

No, this specific model is rated for standard 80 percent continuous current. Applications requiring a 100 percent continuous current rating need the catalog number PGA36100CU31A.

The "U31A" indicates the breaker is equipped with a MicroLogic 3.0 electronic trip unit. This basic electronic unit provides adjustable Long-Time and Instantaneous (LI) protection but does not include ammeter or advanced communication features.

The "A" in the PGA prefix designates an I-Line plug-on connection. The line side features spring-loaded jaws that clamp directly onto the panelboard busbars, while the load side uses traditional mechanical lugs.

If the system fault current exceeds the "G" tier limits, you can upgrade to the "J" interrupting tier using catalog number PJA36100U31A. The J-tier equivalent provides 100 kA at 240VAC, 65 kA at 480VAC, and 25 kA at 600VAC.

Yes, PowerPacT P-frame breakers feature interchangeable trip units. If your application requirements change, the standard MicroLogic 3.0 can be field-upgraded to advanced MicroLogic units, such as the 5.0 (LSI) or 6.0 (LSIG) models.

Yes, the MicroLogic 3.0 electronic trip unit utilizes True RMS sensing. This allows it to accurately measure current and provide reliable overcurrent protection even in systems with significant harmonic distortion.