3VA5330-7EC31-0AA0 - 300A Class CJAS 3-Pole Circuit Breaker

3VA5330-7EC31-0AA0 - 300A Class CJAS 3-Pole Circuit Breaker

If you just need a circuit breaker that’s going to do its job day in and day out, the Siemens 3VA5330-7EC31-0AA0 is a solid pick. It’s a 300 amp, 3-pole breaker from the 3VA5 series, built for typical commercial and industrial setups where reliability matters more than anything else. Nothing fancy here—and that’s a good thing. It uses a thermal magnetic trip, so it handles overloads steadily and reacts quickly if there’s a short circuit. With a 100 kA rating at 480V AC, it’s more than capable for systems where available fault current is on the higher side. This is the kind of breaker you install and don’t have to think about again.

Key Features and Benefits

• 300 amp rating for standard commercial and industrial loads
• 3-pole design for three-phase systems
• Thermal magnetic trip unit for simple, dependable protection
• 100 kA interrupting capacity @ 480V AC for higher fault levels
• Fixed overload setting (300A)—no guesswork
• Adjustable instantaneous trip (5–10x) if you need to fine-tune
• 400A frame keeps it compact for its class

Technical Specifications

• Part Number: 3VA5330-7EC31-0AA0
  
• Series: 3VA5
  
• Amperage: 300A
  
• Poles: 3
  
• Trip Type: Thermal Magnetic (TM230)
  
• Interrupt Rating: 100 kA @ 480V AC
  
• Overload (Ir): 300A (fixed)
  
• Instantaneous (Ii): 5–10x adjustable
  
• Size: 9.8" H x 6.3" W x 5.9" D
  
• Lugs: Not included
  

Material Compliance and Certifications

• UL Listed
• Meets standard U.S. electrical safety requirements
• Built for consistent performance in commercial environments

Where It Works Best

• You’ll typically see this used in panelboards, switchgear, and distribution systems in commercial buildings or light industrial facilities. It’s a good fit anywhere you’ve got three-phase power and a need for dependable protection without a lot of adjustment or complexity.