Built for commercial power distribution, the Square D PGL36100U41A is a 3-pole, 1000A electronic trip circuit breaker. It provides long-time and instantaneous (LI) protection via a Micrologic 3.0A trip unit, which includes an integrated ammeter for precise current monitoring. This unit mount P-Frame breaker is designed to fit Square D enclosures, QED switchboards, and Model 6 motor control centers. It features true RMS sensing, an 80% continuous current rating, and HACR certification.
What does the U41A suffix mean on the PGL36100U41A?
The U41A designation indicates the breaker is equipped with a Micrologic 3.0A electronic trip unit. This provides adjustable long-time and instantaneous (LI) protection, plus an integrated ammeter for local current monitoring.
Can the PGL36100U41A be installed in an I-Line panelboard?
No. This is a unit mount, feed-thru circuit breaker designed for individual enclosures, QED switchboards, and Model 6 Motor Control Centers. It lacks the plug-on jaw assembly required for I-Line distribution panels.
Is this 1000A breaker rated for 100 percent continuous current?
No, the PGL36100U41A is a standard 80 percent rated circuit breaker. Continuous loads must not exceed 800 amps to comply with standard National Electrical Code (NEC) requirements.
Does this breaker provide equipment ground fault protection?
No. The included Micrologic 3.0A trip unit only offers long-time and instantaneous (LI) trip functions. If your 1000A application requires ground fault protection (LSIG) to meet NEC Article 230.95, a different trip unit configuration is required.
What are the lug requirements for terminating this 1000A breaker?
The factory lugs require four parallel conductors per phase. Each lug accepts 3/0 AWG to 500 kcmil aluminum or copper wire. Installers must verify the enclosure provides adequate wire bending space for four 500 kcmil cables per phase.
What does the G in the PGL frame designation represent?
The G indicates the specific interrupting rating tier for this PowerPacT P-Frame breaker. It denotes a maximum short circuit current rating of 65kA at 240VAC, 35kA at 480VAC, and 18kA at 600VAC.
How does the integrated ammeter improve system safety?
The Micrologic 3.0A trip unit features a digital ammeter that displays real-time phase currents. This allows facility personnel to verify load balance across all three phases and identify potential overload conditions before the breaker trips.
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