Square D FI36040 – 40A 3 Pole Molded Case Circuit Breaker Popular

Part of the legacy F-Frame series, this 40-amp device offers superior short-circuit interruption capabilities for commercial facilities. The three-pole configuration utilizes fixed thermal and magnetic trip elements to safeguard critical infrastructure. Designed specifically for Square D I-Line panelboards, the unit features a plug-on line connection and includes load-side lugs. When upgrading aging infrastructure, engineers can specify the PowerPact HRA36040U31X as the modern replacement.