You have a hot tub, a large air conditioner, or a subpanel that just stopped working — the 40-amp double-pole circuit is dead and you need to rule out the breaker fast. A failed 40-amp breaker that won't trip and provides no voltage is a common failure in panels that are 20+ years old. Homeline 2-pole 40-amp breaker for 240V circuits requiring 40-amp protection. Handles the larger 240V loads: hot tubs, large AC units, electric heaters, and subpanel feeds. 1-inch per pole format occupies two adjacent spaces. Common trip means both hot legs open simultaneously. 10,000 AIC interrupt rating. Compatible with Square D Homeline and most standard residential panels. Standard in the service inventory of electricians and HVAC technicians across northeast Nebraska and northwest Iowa — the 40-amp doub Stocked at Crofton Lumber and Akron Lumber.