3VA5270-5EC31-0AA0 - MFAS 70 Amp Circuit Breaker

3VA5270-5EC31-0AA0 - MFAS 70 Amp Circuit Breaker

If you’re looking for a reliable 70 amp circuit breaker that just works the way it’s supposed to, the Siemens 3VA5270-5EC31-0AA0 is an easy choice. It’s part of Siemens’ 3VA5 series—a line a lot of contractors and facility teams stick with because it’s consistent, straightforward, and doesn’t give you surprises in the field. This is a 3 pole circuit breaker built for three-phase systems, and it’s designed to handle both overloads and short circuits using a thermal magnetic trip unit. In plain terms, it reacts when it should, shuts things down when it has to, and helps protect your equipment from damage. One thing people like about this model is that it’s factory set. There’s no dialing things in or second-guessing settings during installation. You mount it, connect it, and move on. That alone saves time—and reduces the chance of errors. With a 35kA interrupting rating at 480V, this breaker is ready for the kind of fault levels you typically see in commercial buildings and light industrial environments. It’s not overbuilt, but it’s definitely not underpowered either—it sits right in that practical sweet spot. And from a fit standpoint, it’s compact enough to slide into most standard panels without turning your install into a project.

Key Features and Benefits

• 70 amp circuit breaker for dependable everyday protection
• 3 pole design for full three-phase coverage
• 35kA @ 480V rating for handling higher fault currents
• Thermal magnetic trip unit for simple, proven performance
• Fixed trip settings—no adjustments needed during install
• Fast response to short circuits with instantaneous trip (10x In)
• Compact size that fits well in common panel setups
• Part of the Siemens 3VA5 series, widely used across industries

Technical Specifications

• Part Number: 3VA5270-5EC31-0AA0
  
• Manufacturer: Siemens
  
• Series: 3VA5 (3VA52 Frame)
  
• Amperage: 70A
  
• Poles: 3
  
• Voltage Rating: Up to 480V
  
• Interrupting Capacity: 35kA @ 480V
  
• Trip Unit: Thermal Magnetic (TM230)
  
• Overload Protection (Ir): 70A (fixed)
  
• Instantaneous Trip (Ii): 10x In
  
• Dimensions: 9.65" H x 6.3" W x 5.9" D
  
• Mounting Type: Fixed
  
• Interrupting Class: M
  

Material Compliance and Certifications

• UL Listed for use in U.S. electrical systems
• Meets standard industry safety and performance requirements
• RoHS compliant, limiting hazardous materials
• Built for long-term use in commercial and industrial environments

Where It Works Best

• This Siemens 70A breaker fits right into applications like: Commercial building electrical panels Industrial control panels and equipment HVAC systems and motor protection Manufacturing environments General three-phase power distribution