3VA5212-6EF31-0AA0 - HFAS 125 Amp Circuit Breaker

3VA5212-6EF31-0AA0 - HFAS 125 Amp Circuit Breaker

The Siemens 3VA5212-6EF31-0AA0 is a straightforward 125 amp, 3-pole circuit breaker built for typical three-phase setups. It’s the kind of breaker you use when you want something dependable without overcomplicating the install or setup. It comes with a thermal magnetic trip unit, so it takes care of both overloads and short circuits on its own. No adjustments, no extra configuration—it’s already set at the factory. For a lot of applications, that’s exactly what you want—less time dialing things in, more time getting the system up and running. On the protection side, it holds up well where fault current is a concern. You’re looking at 35kA at 480V, with higher Class H capability behind it. That gives it enough strength for many commercial and light industrial systems. It’s also a manageable size, so it doesn’t turn into a fight when you’re working inside a panel.

Key Features and Benefits

• 125 amp rating: for common commercial and industrial loads
• 3-pole design: for three-phase power
• Thermal magnetic trip: for both overload and short-circuit protection
• 35kA interrupting rating: at 480V
• Fixed trip settings: (no field adjustments needed)
• Fits into standard panel spaces: without much trouble
• Designed for consistent, everyday use

Technical Specifications

• Part Number: 3VA5212-6EF31-0AA0
• Series: 3VA52 (Frame 250)
• Poles: 3
• Amperage: 125A
• Interrupting Rating: 35kA @ 480V (Class H up to 65kA @ 480V)
• Trip Unit: Thermal Magnetic (TM240, ATAM)
• Overload Protection: 125A (fixed)
• Instantaneous Trip: 10x In
• Dimensions: 9.65" H × 6.3" W × 5.9" D

Material Compliance and Certifications

• UL standards: Built to meet UL standards, so it lines up with what inspectors and most commercial specs call for—nothing unusual here—just what you’d expect for this type of breaker.

Where It Works Best

• This model fits into commercial panels, industrial equipment, and general three-phase distribution systems. It’s a practical option anywhere you need solid protection without getting into more complex or adjustable breaker setups.