APC PD3P300AT5B 300A 3-Pole Breaker for Symmetra PX | Enterprise Power

Keep high-density power infrastructure within its designed operating envelope. APC’s 3-pole circuit breaker, model PD3P300AT5B, is built for Symmetra PX250 and PX500 kW systems that demand precise protection at substantial current levels. With a 300A rating and T5 type construction, it is intended for use in large-scale UPS environments where breaker selection directly affects system reliability and service continuity. This is the kind of component procurement teams specify when the power architecture is already doing serious work. In Symmetra PX deployments, the breaker is not an accessory; it is part of the protection strategy that helps preserve uptime, isolate faults, and maintain predictable behavior under load. APC and Schneider Electric bring the infrastructure pedigree expected in enterprise power rooms, data centers, and critical facilities. For organizations standardizing on Symmetra PX, this breaker supports a clean fit with the platform’s electrical design. It is a practical choice when the priority is protecting expensive upstream and downstream assets with hardware matched to the system’s capacity and operating profile.