Q1B370 - 70 Amp Circuit Breaker

Q1B370 - 70 Amp Circuit Breaker

Need a Q1B370 circuit breaker to match an existing installation? This 70-amp, 3-pole Type Q1B breaker uses a bolt-on connection and thermal-magnetic trip design. It is rated 10 kA I.C. at 240VAC and measures 6.38 inches high by 2.25 inches wide by 2.31 inches deep. The breaker requires six spaces, so that’s an important detail to check when confirming fit.

The Q1B370 is especially useful when you’re working with existing electrical equipment where changing breaker styles isn’t the goal. In those situations, the important things are straightforward: does the breaker have the right amperage, number of poles, voltage, and interrupting rating, and does it physically fit the equipment? If your application calls for the Q1B370 configuration, this breaker provides the form and function needed to keep that existing system in service. It’s built to last when properly selected, installed, and maintained.

Key Features and Benefits

• 70-amp rating for applications designed around a 70A breaker.
• Three poles for compatible three-pole electrical circuits.
• Bolt-on design for equipment that accepts this Q1B breaker style.
• Thermal-magnetic operation provides overload and short-circuit protection.
• Rated 10k A.I.C. at 240VAC.
• Six-space configuration helps identify the correct physical fit before installation.
• Well suited for maintenance and replacement work in existing electrical systems.
• Designed for applications where matching the original breaker’s form, fit, and function is important.

Technical Specifications

• Part Number: Q1B370
  
• Type: Q1B
  
• Breaker Style: Bolt-On Thermal Magnetic
  
• Amperage: 70A
  
• Poles: 3
  
• A.I.C. Rating: 10k
  
• Voltage: 240VAC
  
• Height: 6.38 in.
  
• Width: 2.25 in.
  
• Depth: 2.31 in.
  
• Mounting Style: Bolt-On
  
• Spaces Required: 6
  

Material Compliance and Certifications

• Specific material compliance information and agency certifications are not provided in the available specifications for the Q1B370. Check the markings on the breaker itself and the documentation for the electrical equipment to confirm any required approvals or compliance information. The breaker should always be used within its marked electrical ratings and installed in accordance with applicable electrical codes and equipment requirements.

Where It Works Best

• The Q1B370 makes the most sense for existing or legacy electrical equipment designed to use Type Q1B bolt-on circuit breakers. It’s a straightforward option for maintenance and replacement jobs where keeping the correct breaker configuration matters.
• Before installation, compare the Q1B370 with the breaker being replaced and with the equipment's requirements. Check the 70-amp rating, three-pole, 240VAC rating, 10k A.I.C. rating, bolt-on mounting, six-space requirement, and physical dimensions. A matching amperage alone doesn’t establish compatibility.