BQ3B040 - 40Amp Circuit Breaker

BQ3B040 - 40Amp Circuit Breaker

Secure your three-phase circuits with the Siemens BQ3B040, a 40-amp, 3-pole molded case circuit breaker designed for reliable branch circuit protection in commercial and industrial electrical systems. Part of the trusted Siemens Type BQ family, this common-trip breaker disconnects all three poles simultaneously if an overload or short circuit occurs, keeping your equipment safe and operations uninterrupted. Rated for 240VAC with a 10 kA interrupting capacity (10kAIC), it fits neatly into compatible panelboards, and the included load-side lugs simplify installation. Ideal for motor circuits, HVAC systems, control panels, and other 240-volt three-phase applications, the BQ3B040 delivers dependable protection that integrates seamlessly with legacy Siemens systems.

Key Features and Benefits

• 40 amp, 3-pole molded case circuit breaker
• Common-trip design for simultaneous pole protection
• Rated for 240VAC systems
• 10 kA interrupting capacity (10kAIC)
• Bolt-on mounting for a secure panel connection
• Load-side lugs included for simpler wiring
• Designed for branch circuit protection in commercial and industrial environments
• Compatible with legacy Siemens Type BQ panelboards
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: BQ3B040
  
• Number of Poles: 3
  
• Voltage Rating: 240 VAC
  
• Amperage Rating: 40 Amps
  
• Interrupting Rating: 10 kAIC
  
• Trip Type: Common Trip
  
• Mounting Type: Bolt-On
  
• Electrical Connection Type: Bolt-On
  
• Dimensions: 4 in. D × 3 in. W × 3 in. H
  
• Net Weight: 1.014 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 Listed
• Built to Siemens standards for low-voltage electrical distribution
• Active product lifecycle
  

Where It Works Best

• Perfect for commercial buildings, factories, schools, warehouses, and other facilities where three-phase branch circuit protection is required.