BQD140 - 40Amp Circuit Breaker

BQD140 - 40Amp Circuit Breaker

The Siemens BQD140 is a 40-amp, single-pole breaker that protects circuits from overloads and short circuits. It’s made for panelboard use and fits neatly in tight spaces. The thermal magnetic trip reacts to long-term overloads and sudden faults, helping you prevent damage to wiring and equipment without causing unnecessary shutdowns. Rated for 277VAC with a 14 kAIC interrupting capacity, the BQD140 works well in lighting panels, control panels, and other low-voltage systems. Electricians and facility teams trust it for everyday circuit protection that keeps your systems running safely.

Key Features and Benefits

• 40 Amp rating for branch circuits
• Single-pole design for 277VAC systems
• Thermal magnetic trip for overload and short-circuit protection
• 14 kAIC interrupting capacity
• Panelboard mounting for easy installation
• Molded case for durability
• Low-tab connections for secure wiring
• Protects wiring, circuits, and equipment

Technical Specifications

• Catalog Number: BQD140
• Manufacturer: Siemens
• Series: BQD
• Poles: 1
• Amp Rating: 40 Amps
• Voltage Rating: 277 VAC
• Frequency: 50/60 Hz
• Interrupting Rating: 14 kAIC
• Trip Unit: Thermal Magnetic
• Mounting Style: Panelboard
• Connection Type: Low Tab
• Frame Size: 100A
• Width: 3 in. | Height: 1 in. | Depth: 4 in.
• Enclosure Material: Molded Case
• Max Operating Temp: 40°C
• Net Weight: 0.549 lb

Material Compliance and Certifications

• UL 489 Listed
• CSA C22.2 Certified
• RoHS Compliant
• WEEE Compliant
• REACH Information Available

Where It Works Best

• The BQD140 is commonly used in offices, schools, commercial buildings, retail spaces, healthcare facilities, and industrial settings.