3VA5340-5EC31-0AA0 - 400A Class MJAS 3-Pole Circuit Breaker

3VA5340-5EC31-0AA0 - 400A Class MJAS 3-Pole Circuit Breaker

If you’re running serious power through your system, you don’t have room for guesswork. The Siemens 3VA5340-5EC31-0AA0 is built for exactly that kind of environment—where reliability isn’t optional, and protection needs to respond instantly. This 400-amp, 3-pole circuit breaker from the Siemens 3VA5 series is designed to protect your equipment from overloads and short circuits before they turn into expensive problems. With a 35 kA interrupting rating at 480V AC, it’s ready to handle high fault conditions with confidence. The thermal magnetic trip unit keeps things simple and dependable—fixed overload protection and an adjustable instantaneous trip range mean it does its job without constant tweaking. Whether you’re upgrading an existing panel or specifying components for a new install, this breaker gives you that “install it and trust it” peace of mind.

Key Features and Benefits

• 400A Power Handling – Built for high-demand commercial and industrial applications
• 3-Pole Protection – Covers all phases for balanced and consistent system safety
• Thermal Magnetic Trip Unit (TM230) – Proven, reliable protection against overloads and short circuits
• 35 kA @ 480V AC Interrupting Capacity – Handles high fault currents without hesitation
• Fixed Overload Setting (Ir = 400A) – No adjustments needed—set for dependable performance
• Adjustable Instantaneous Trip (5–10x In) – Fine-tune response to match your system needs
• Compact Frame Design – Saves valuable panel space without compromising capability
• Built by Siemens – A name trusted across commercial and industrial electrical systems

Technical Specifications

• Part Number: 3VA5340-5EC31-0AA0
• Series: Siemens 3VA53 (3VA5 family)
• Amperage: 400A
• Poles: 3
• Trip Unit: Thermal Magnetic (TM230)
• Interrupting Rating: 35 kA @ 480V AC
• Overload Protection (Ir): Fixed at 400A
• Instantaneous Trip (Ii): Adjustable, 5–10x rated current
• Dimensions:
  • Height: 9.8 in
  • Width: 6.3 in
  • Depth: 5.9 in
• Lugs: Not included

Material Compliance and Certifications

• This breaker is UL-listed and meets recognized North American safety standards for low-voltage circuit protection. Siemens manufactures the 3VA5 series using high-quality materials designed for consistent performance, durability, and compliance in demanding electrical environments.

Where It Works Best

• The Siemens 3VA5340-5EC31-0AA0 is a smart choice for: Commercial electrical distribution systems Industrial facilities and manufacturing plants Panelboards and switchgear upgrades High-load applications where downtime is costly Contractors and engineers who need dependable, no-nonsense protection