3VA5330-6EC31-0AA0 - 300A Class HJAS 3-Pole Circuit Breaker

3VA5330-6EC31-0AA0 - 300A Class HJAS 3-Pole Circuit Breaker

If you’re working with a system where failure isn’t an option, the Siemens 3VA5330-6EC31-0AA0 is the kind of breaker you put in and don’t have to think about again. It’s part of Siemens’ 3VA5 line, built for serious electrical distribution jobs where dependable protection is expected—not optional. This is a 300A, 3-pole thermal-magnetic breaker designed for line protection in commercial and industrial applications. The trip unit is straightforward and reliable: fixed overload protection at 300A, plus an adjustable instantaneous trip (5–10x) to handle short-circuit events—no unnecessary complexity—just solid, predictable performance. With a 65kA interrupting rating at 480V AC, it’s ready for higher fault levels commonly found in larger facilities. It’s also built on a 400A frame, giving you a bit of headroom while keeping the footprint manageable inside your panel. Like most professional-grade breakers, lugs aren’t included, so you can choose the ones that best fit your setup.

Key Features and Benefits

• 300 Amp rating for reliable performance in demanding systems
• 3-pole design for three-phase applications
• The thermal magnetic trip unit (TM230) keeps protection simple and dependable
• Adjustable instantaneous trip (5–10x) helps match real-world conditions
• 65kA @ 480V AC interrupting capacity handles high fault currents
• 400A frame size offers flexibility in system design
• H-interrupting class (HJAS) suited for tougher environments
• Built by Siemens, a name that contractors and engineers trust

Technical Specifications

• Part Number: 3VA5330-6EC31-0AA0
• Series: 3VA5
• Amperage: 300A
• Poles: 3
• Frame Size: 400A
• Trip Unit: Thermal Magnetic (TM230)
• Overload Protection (Ir): 300A (fixed)
• Short-Circuit Protection (II): 5–10x adjustable
• Interrupting Rating: 65kA @ 480V AC
• Dimensions:
  • Height: 9.8 in
  • Width: 6.3 in
  • Depth: 5.9 in
• Lugs: Not included

Material Compliance and Certifications

• UL Listed for use in the U.S.
• Designed to meet standard North American electrical requirements
• Manufactured to Siemens’ established quality standards for consistent performance

Where It Works Best

• Commercial buildings and tenant build-outs
• Manufacturing and industrial facilities
• Main and sub-distribution panels
• Equipment protection where a higher fault current is a concern
• Upgrade projects replacing older or undersized breakers