Product Overview
Replace or expand circuits in your Square D QO load center with the Siemens 40 Amp Double‑Pole Type QD Replacement Circuit Breaker. UL classified as a direct replacement for Square D type QO breakers, this 3/4" plug‑in breaker snaps onto QO‑style bussing and provides reliable overcurrent protection for residential or light commercial applications.
Rated for 40A, 120/240V AC, this double‑pole breaker is ideal for 240V loads such as water heaters, small HVAC equipment, or subpanels (when properly sized and installed). All Siemens QD breakers include load‑side connectors suitable for 60/75°C wire and are calibrated for 40°C maximum ambient applications, helping ensure dependable performance under typical installation conditions.
Key Features & Benefits
- 40 Amp Double‑Pole Breaker – Suitable for 120/240V AC circuits requiring 40A protection.
- Type QD, Square D QO Compatible – 3/4" plug‑in format designed to fit Square D QO load centers.
- UL Classified Replacement – Tested and listed for use in place of Square D type QO circuit breakers.
- Load‑Side Connectors – Accept 60/75°C rated conductors; calibrated for use in 40°C maximum ambient conditions.
- HACR & SWD Rated – Suitable for HVAC (Heating, Air Conditioning, Refrigeration) applications and switching duty where applicable.
- UL 489 Tested – Developed and tested to meet or exceed UL 489 standards for safety and performance.
- Residential & Commercial Use – Designed for use in both home and light commercial electrical systems.
