3VA5322-5EC31-0AA0 - 225A Class MJAS 3-Pole Circuit Breaker

3VA5322-5EC31-0AA0 - 225A Class MJAS 3-Pole Circuit Breaker

The Siemens 3VA5322-5EC31-0AA0 is the kind of breaker you use when you don’t want to think about it again after installation. It’s a 225A, 3-pole unit from the 3VA5 series, built for everyday commercial and industrial distribution—no extra bells—just dependable protection where it counts. It uses a thermal magnetic trip unit, so it reacts to both overloads and short circuits without any complicated add-ons. The interrupting rating is 35 kA at 480V, which gives you a comfortable margin in systems where the available fault current isn’t low. That matters more in the real world than most spec sheets let on. What I like here is the balance. The overload protection is fixed at 225A, so there’s nothing to dial in or second-guess during install. At the same time, you still get an adjustable instantaneous trip (5–10x), which helps when dealing with motors or equipment that pull hard on startup. It’s simple, but not limiting.

Key Features and Benefits

• Handles both overloads and short circuits: with a thermal magnetic trip
• 35 kA interrupting rating at 480V AC: for solid fault protection
• 225A rating: covers a wide range of typical applications
• 3-pole setup: for standard three-phase systems
• Fixed overload setting: install it and move on
• Adjustable instantaneous trip: helps reduce nuisance trips
• Built on a 400A frame: for consistent performance over time
• Straightforward design: that’s easy to work with

Technical Specifications

• Part Number: 3VA5322-5EC31-0AA0
• Series: 3VA53
• Frame Size: 400A
• Poles: 3
• Current Rating: 225 Amps
• Interrupting Capacity: 35 kA @ 480V AC
• Trip Unit: TM230 (thermal magnetic)
• Overload Protection (Ir): 225A (fixed)
• Instantaneous Trip (Ii): Adjustable, 5–10x
• Dimensions:
  • 9.8" H
  • 6.3" W
  • 5.9" D
• Lugs: Not included
• Class: M (MJAS)

Material Compliance and Certifications

• UL Requirements: This breaker meets UL requirements for low-voltage circuit protection, making it suitable for code-compliant installations in commercial and industrial environments.

Where It Works Best

• You’ll typically see this in panelboards, switchgear, and distribution setups where loads are steady, and reliability matters more than constant adjustability. Good fit for commercial buildings, equipment feeds, and light industrial applications. It’s especially useful in spots where you want to install it once and not have to revisit it unless something actually goes wrong.