HMA3300T - 300Amp Trip Unit

HMA3300T - 300Amp Trip Unit

When you’re maintaining existing electrical equipment, getting the right trip unit matters. The HMA3300T is a 300-amp, 3-pole thermal-magnetic trip unit designed for use with compatible MA and HMA frames. It has a magnetic Hi-Low trip setting range of 1500–3000 and measures approximately 4.00" W x 7.50"L x 3.50" D. For facilities and maintenance teams working with legacy electrical systems, this unit can provide the form, fit, and function needed to replace a matching HMA3300T without changing the intended breaker configuration.

Key Features and Benefits

• 300 Amp rating for applications requiring this specific amperage
• Three-pole design for compatible three-pole breaker configurations
• Thermal magnetic trip operation for MA and HMA frames
• 1500–3000 magnetic Hi-Low trip setting range
• Designed around the form, fit, and function requirements of compatible existing equipment
• Useful for maintenance and replacement work involving legacy electrical distribution systems
• Straightforward specifications make it easier to compare against an existing trip unit
  

Technical Specifications

• Part Number: HMA3300T
  
• Type: HMA
  
• Trip Type: Thermal Magnetic
  
• Frame Compatibility: MA and HMA
  
• Amperage: 300 Amps
  
• Number of Poles: 3
  
• Magnetic Hi-Low Trip Setting Range: 1500–3000
  
• A.I.C. Rating: Not specified
  
• Voltage: Not specified
  
• Height: 7.5 in.
  
• Width: 4.0 in.
  
• Depth: 3.5 in.
  
• Overall Dimensions: 4.00"W x 7.50"L x 3.50"D
  
• Approximate Shipping Weight: 6.00 lbs.
  

Material Compliance and Certifications

Material compliance and certification details were not provided in the available HMA3300T specifications. Because requirements can vary by equipment and application, certifications or listings should not be assumed.

If your installation requires a specific certification or compliance standard, check the unit's markings and the documentation for the associated electrical equipment before installation.

Where It Works Best

The HMA3300T makes the most sense in existing electrical systems that already use a compatible MA or HMA frame and call for a 300-amp, 3-pole thermal-magnetic trip unit. It is particularly relevant for maintenance and replacement jobs where keeping the original breaker configuration is important.