BQD170 - 70Amp Circuit Breaker

BQD170 - 70Amp Circuit Breaker

The Siemens BQD170 is a 70-amp, single-pole circuit breaker used to protect 277VAC circuits from overloads and short circuits. It's commonly found in commercial and industrial electrical systems, particularly in panelboards serving lighting and branch circuit applications.

The breaker uses a thermal magnetic trip mechanism, which remains one of the most widely used forms of circuit protection. If an overload develops over time, the thermal element responds accordingly. If a short circuit occurs, the magnetic trip reacts almost immediately. This combination helps protect your conductors and connected equipment from damage while allowing normal circuit operation to continue uninterrupted.

Because the BQD170 is designed for panelboard mounting, it's often used in offices, schools, healthcare facilities, retail buildings, warehouses, and manufacturing environments. Its compact molded case design helps you conserve space inside the panel, while the 14 kAIC interrupting rating provides the fault-clearing capability needed for many commercial electrical systems.

For electrical contractors and maintenance personnel, the BQD170 is a straightforward replacement or installation choice when a 70-amp, 277VAC breaker is required.

Key Features and Benefits

• 70 Amp current rating
  
• Single-pole configuration
  
• Rated for 277VAC applications
  
• Thermal magnetic trip protection
  
• 14 kAIC interrupting rating
  
• Panelboard mounting design
  
• Low-tab connection style
  
• Compact molded case construction
  
• Helps protect against overloads and short circuits
  
• Suitable for commercial and industrial electrical systems
  

Technical Specifications

• Catalog Number: BQD170
  
• Manufacturer: Siemens
  
• Series: BQD
  
• Number of Poles: 1
  
• Current Rating: 70 Amps
  
• Voltage Rating: 277 VAC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 14 kAIC
  
• Trip Unit: Thermal Magnetic
  
• Mounting Style: Panelboard Mount
  
• Connection Type: Low Tab
  
• Frame Size: 100A
  
• Width: 3 in.
  
• Height: 1 in.
  
• Depth: 4 in.
  
• Enclosure Type: Molded Case Circuit Breaker
  
• Maximum Ambient Temperature: 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 Siemens BQD170 is frequently used in panelboards, lighting distribution systems, branch circuits, and control panels throughout commercial and industrial facilities. It is a good fit anywhere a 70-amp, 277VAC circuit breaker is needed for everyday circuit protection.