Square D HDA36040 Molded Case Circuit Breaker

The Square D HDA36040 Molded Case Circuit Breaker is a 3-pole, 40-amp device from Square D’s PowerPact family, engineered for safe interruption of three‑phase, 600 V AC circuits. Designed for I-Line panelboard installations, it provides robust overcurrent protection for distribution feeders, motors, and control circuits in commercial and light industrial electrical systems, while preserving space in compact switchgear. The HDA36040 designation identifies a 3-pole, 40‑amp rating within the PowerPact H‑frame lineup, combining a molded‑case construction with proven bus connection and field‑installable line/load orientation for easy integration in compatible Square D enclosures. As part of Square D’s PowerPact line, this breaker is purpose-built to fit panels that use I-Line configuration, enabling streamlined protection across three phases in a single device.