The Siemens Q240 Double‑Pole Circuit Breaker is a reliable 2‑pole (2P) breaker designed to provide dependable overcurrent protection for residential and light commercial electrical systems. Manufactured by Siemens Energy, this breaker is part of the trusted Q‑Series, known for durable construction, consistent performance, and compatibility with Siemens load centers.

Rated at 40 amps and approved for 120/240‑volt applications, the Q240 is ideal for protecting higher‑demand 240‑volt branch circuits. As a double‑pole breaker, it connects to both hot bus bars in the panel and ensures simultaneous tripping of both poles, providing proper protection for 240‑volt circuits while supporting safe and code‑compliant electrical installations.

The breaker utilizes Siemens’ proven thermal‑magnetic trip mechanism, delivering accurate protection against both sustained overloads and instantaneous short circuits. Designed with a plug‑on mounting system, the Q240 installs quickly and securely in Siemens load centers approved for Q‑Series breakers, delivering long‑term reliability and consistent electrical performance.

Key Features

• Double‑pole (2P) breaker for 240‑volt applications
• 40‑amp rating for higher‑load branch circuits
• Thermal‑magnetic tripping for reliable overload and short‑circuit protection
• Plug‑on design for fast, secure installation
• Trips both poles simultaneously for enhanced safety
• Built to Siemens Energy quality and performance standards
• Compatible with Siemens load centers approved for Q‑Series breakers
• Suitable for new installations or replacement use

Specifications

• Manufacturer: Siemens Energy
• Series: Q‑Series
• Model Number: Q240
• Breaker Type: Double‑Pole (2P)
• Number of Poles: 2
• Amperage Rating: 40 Amps
• Voltage Rating: 120/240 VAC
• Tripping Mechanism: Thermal‑magnetic
• Mounting Type: Plug‑on
• Load Center Compatibility: Siemens load centers approved for Q‑Series breakers
• Application Rating: Branch circuit protection

Applications

• Residential Siemens electrical panels
• Light commercial load centers
• 240‑volt branch circuits requiring 40‑amp protection
• HVAC equipment, water heaters, ranges, and larger appliances
• Replacement of existing Siemens double‑pole circuit breakers