MBK100A - 100 Amp Circuit Breaker

MBK100A - 100 Amp Circuit Breaker

If you need a replacement 100 Amp main circuit breaker, the MBK100A is built for applications that call for a 2-pole breaker with a 22kA interrupting rating at 240VAC. It uses a thermal-magnetic trip design that helps protect electrical systems from overloads and short-circuit conditions. That combination makes it a common choice for service equipment and distribution panels where reliable circuit protection is required. The breaker is rated for operation at 40°C and 50/60Hz. It accepts either copper or aluminum conductors from #1 AWG through 300 kcmil and is intended for use with 75°C wire. An HACR Type rating also makes it suitable for qualifying heating, air conditioning, and refrigeration equipment. Before installation, always verify compatibility with your panel and follow all applicable electrical codes.

Key Features and Benefits

• 100 Amp current rating.
• 2-pole configuration.
• Thermal magnetic trip protection.
• 22kA interrupting capacity at 240VAC.
• HACR Type rated.
• Suitable for 50/60Hz systems.
• Accepts copper or aluminum wire.
• Wire range: #1 AWG to 300 kcmil.
• Designed for use with 75°C conductors.
• 250 lb-in.
  

Technical Specifications

• Part Number: MBK100A
  
• Product Type: Main Circuit Breaker
  
• Type: M2
  
• Poles: 2
  
• Current Rating: 100 Amps
  
• Voltage Rating: 240VAC
  
• Interrupting Rating: 22kA @ 240VAC
  
• Trip Type: Thermal-Magnetic
  
• Frequency: 50/60Hz
  
• Operating Temperature: 40°C
  
• HACR Rating: Yes
  
• Wire Rating: 75°C
  
• Wire Range: #1 AWG–300 kcmil CU/AL
  
• Terminal Torque: 250 lb-in.
  
• Dimensions:
  • Height: 6.0 in.
  • Width: 2.0 in.
  • Depth: 2.81 in.

Material Compliance and Certifications

• This breaker is HACR Type rated and is intended for use with 75°C copper or aluminum conductors within the specified wire range. Installation should always comply with the manufacturer's requirements and applicable local and national electrical codes.
  

Where It Works Best

• The MBK100A is commonly used as a main circuit breaker in compatible electrical panels serving residential, commercial, and light industrial facilities. It is also suitable for qualifying HVAC and refrigeration equipment where a 100-amp, 2-pole breaker with a 22 kA interrupting capacity is required.