HLD3300 - 300Amp Circuit Breaker

HLD3300 - 300Amp Circuit Breaker

When you’re replacing a circuit breaker in existing equipment, getting the details right matters. The Eaton HLD3300 is a 300-amp, three-pole Series C molded case circuit breaker built around an L-frame HLD configuration. It carries voltage ratings of 600 Vac and 250 Vdc and uses Eaton’s T186 trip type, with fixed thermal and fixed magnetic trip functions.

Key Features and Benefits

• 300A amperage rating for equipment designed around a 300-amp breaker.
• Three-pole design for compatible three-phase applications.
• Rated for 600 Vac and 250 Vdc.
• Uses the T186 trip type with fixed thermal and fixed magnetic trip functions.
• HLD breaker type and L-frame construction make it easier to identify when matching an existing breaker.
• Supplied as a complete breaker, rather than an individual breaker component.
• Equipped with aluminum line and load terminals.
• Rated for 50/60 Hz applications.
• UL Listed for applications requiring this certification.
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: HLD3300
  
• UPC: 786679006559
  
• Product Type: Molded case circuit breaker
  
• Series: Series C
  
• Breaker Type: HLD
  
• Frame: L
  
• Frame Type: Complete breaker
  
• Amperage Rating: 300 A
  
• Voltage Rating: 600 Vac, 250 Vdc
  
• Number of Poles: Three-pole
  
• Trip Type: T186
  
• Trip Function: Fixed thermal, fixed magnetic
  
• Interrupt Rating at 240 Vac: 100 kAIC
  
• Interrupt Rating at 480 Vac: 65 kAIC
  
• Frequency Rating: 50–60 Hz
  
• Terminals: Line and load
  
• Terminal Material: Aluminum
  
• Length/Depth: 8 in
  
• Height: 10 in
  
• Width: 10 in
  
• Product Weight: 21 lb
  
• Certification: UL Listed
  

Material Compliance and Certifications

The HLD3300 is UL Listed and uses aluminum terminal material for its line and load connections.

When matching a breaker for an existing installation, don’t stop at the amperage or number of poles. Check the complete set of specifications—including frame, voltage, trip type, interrupting rating, terminals, and physical compatibility. Those details help determine whether the HLD3300 is the correct form, fit, and functional replacement for the equipment being serviced.

Where It Works Best

The Eaton HLD3300 makes the most sense for existing electrical distribution equipment that specifically calls for a Series C HLD, L-frame, 300A, three-pole molded-case circuit breaker with matching ratings.

That makes it particularly relevant for maintenance, repair, and replacement work in compatible commercial and industrial electrical systems. If you’re replacing an existing breaker, the HLD3300 catalog number is a useful starting point—but the complete nameplate specifications should still be checked before installation.