3VA5270-7EC31-0AA0 - CFAS 70 Amp Circuit Breaker

3VA5270-7EC31-0AA0 - CFAS 70 Amp Circuit Breaker

When you’re working in an environment where fault current is high, you don’t want to gamble on protection. The Siemens 3VA5270-7EC31-0AA0 is built for that kind of job. It’s a 70-amp, 3-pole circuit breaker designed to handle serious electrical demands, with a 100kA interrupting rating at 480V that helps stop problems before they turn into expensive downtime.

This model uses a thermal magnetic trip unit (TM230), which means it reacts to both overloads and short circuits without needing constant adjustment. The settings are fixed—70A for overload and 10x that for instantaneous trips—so once it’s installed, it just does its job. That’s a big plus if you’re managing multiple panels or don’t want to spend time dialing things in.

It’s also part of Siemens’ 3VA5 series, which is widely used in commercial and industrial setups. In other words, this isn’t a niche piece of gear—it’s something electricians and engineers rely on every day. The size is manageable, the build feels solid, and it fits easily into standard panel configurations.

Key Features and Benefits

• Handles high fault conditions: Handles high fault conditions with a 100kA interrupting rating at 480V
• 70 amp capacity: 70 amp capacity for consistent circuit protection
• 3-pole design: 3-pole design for three-phase systems
• Thermal magnetic trip (TM230): The thermal magnetic trip (TM230) responds to both overloads and short circuits
• Fixed trip settings: Fixed trip settings—no setup or calibration needed
• Compact size: Compact enough for most panel applications
• Proven platform: Backed by Siemens’ proven 3VA5 platform
  

Technical Specifications

• Manufacturer: Siemens
  
• Part Number: 3VA5270-7EC31-0AA0
  
• Series / Frame: 3VA52 (Frame 250)
  
• Poles: 3
  
• Amperage: 70A
  
• Voltage Rating: Up to 480V
  
• Interrupting Capacity: 100kA @ 480V
  
• Trip Unit: Thermal Magnetic (TM230)
  
• Overload Protection (Ir): 70A (fixed)
  
• Short-Circuit Protection (Ii): 10 × In (fixed)
  
• Dimensions: 9.65" H × 6.3" W × 5.9" D
  

Material Compliance and Certifications

• UL Requirements: Meets UL requirements for molded case circuit breakers
• Manufacturing Standards: Manufactured to Siemens’ internal safety and performance standards
• Interrupting Class: Rated as C-Interrupting Class (CFAS) for high-capacity applications
  

Where It Works Best

• You’ll typically see this breaker used in:
• Industrial facilities with a higher available fault current
• Commercial power distribution panels
• OEM equipment and control panels
• Data centers and other critical systems
• Replacement jobs where matching specs really matters