MP140 - 40 Amp Circuit Breaker

MP140 - 40 Amp Circuit Breaker

Protect your home's electrical system with the Siemens MP140, a trusted 1‑pole miniature circuit breaker engineered for residential use. Combining high performance with straightforward installation, this 40-amp breaker offers efficient overload and short‑circuit protection for load centers, panelboards, and home electrical enclosures. If you want dependable circuit protection that keeps your system safe and uninterrupted, the MP140 delivers.

Key Features and Benefits

• Thermal‑Magnetic Trip Mechanism: The MP140 blends thermal and magnetic trip functionality to promptly react to both overloads and short circuits — protecting circuits precisely without unnecessary trips.
• High Interrupt Rating (10 kA): Built to interrupt up to 10,000 amperes in fault conditions, this breaker handles high fault currents safely — giving you peace of mind whether you're wiring standard lighting circuits or heavier loads.
• Compact, Easy-to-Install Design: Its slim profile fits neatly into most residential panels, making installation simple and tidy. Once installed, its sturdy build ensures long-term dependable service under normal household conditions.
• HACR Rated for Versatility: Rated for use with heating, air-conditioning, and refrigeration equipment, the MP140 is a flexible choice if you're wiring circuits for HVAC loads or other household appliances.

Technical Specifications

• Type: MP‑T miniature circuit breaker
  
• Voltage Rating: 120 V
  
• Amperage Rating: 40 A
  
• Number of Poles: 1
  
• Interrupt Rating: 10 kA
  
• Operating Temperature: Up to 40 °C
  
• Dimensions:
  • 0.787 in × 2.756 in × 2.756 in
• Net Weight: 0.265 lb
  

Material Compliance and Certifications

• Industry Standards: The Siemens MP140 meets industry standards for safety and reliability. Its HACR rating ensures compliance for HVAC circuit protection, and its construction adheres to guidelines for residential circuit breakers — making it a suitable and code‑friendly choice for a wide variety of home electrical installations.

Where It Works Best

• This circuit breaker excels in typical residential settings: load centers, panelboards, and household circuit enclosures. Whether you're installing new wiring or upgrading an existing system — and whether you're feeding lighting circuits, receptacles, or HVAC equipment — the MP140 provides consistent, dependable protection. It's an innovative solution for electricians, contractors, or homeowners who value safety, ease of use, and long-term performance.