3VA5217-5EC31-0AA0 - MFAS 175 Amp Circuit Breaker

3VA5217-5EC31-0AA0 - MFAS 175 Amp Circuit Breaker

The Siemens 3VA5217-5EC31-0AA0 is one of those breakers that does what you expect. No extra complexity, no overthinking the setup. It’s a 175 amp, 3-pole unit built on the 3VA5 platform, designed for standard 480V systems where reliability matters more than bells and whistles. It uses a thermal magnetic trip unit, so it handles overloads the way you’d want—gradually when needed, but instantly when there’s a real fault. Short circuit hits? It reacts fast with an instantaneous trip at 10 times the rated current. That’s exactly what you want: protecting your equipment. The 35 kA interrupting rating at 480V provides a comfortable margin for most commercial and light industrial applications. And since the settings are fixed, there’s no fiddling around during install. It’s straightforward—mount it, wire it, and move on to the next job.

Key Features and Benefits

• 175 amp capacity: for common three-phase applications
• Thermal magnetic trip: simple, proven protection
• 35kA @ 480V interrupting rating: handles real fault conditions
• 3-pole configuration: for standard commercial power systems
• Fixed trip settings: no adjustment mistakes, no wasted time
• Part of Siemens’ widely used 3VA5 series

Technical Specifications

• Part Number: 3VA5217-5EC31-0AA0
  
• Series: 3VA52 / 3VA5 Frame 250
  
• Poles: 3
  
• Amperage: 175A
  
• Interrupting Rating: 35kA @ 480V
  
• Trip Type: Thermal Magnetic (TM230)
  
• Overload (Ir): 175A (fixed)
  
• Instantaneous Trip (Ii): 10× In
  
• Dimensions: 9.65" H × 6.3" W × 5.9" D
  

Material Compliance and Certifications

• Built to UL standards: which is what most inspectors and specs will require anyway. Siemens keeps these consistent across the line, so you’re not dealing with surprises from one install to the next.
  

Where It Works Best

• This breaker fits right into commercial panels, industrial equipment, and general power distribution setups running 480V three-phase. You’ll see it in HVAC systems, machinery, and facility power panels—places where you need dependable protection but don’t need adjustable trip units or anything fancy.