3VA5212-5ED31-0AA0 - MFAS 125 Amp Circuit Breaker

3VA5212-5ED31-0AA0 - MFAS 125 Amp Circuit Breaker

The Siemens 3VA5212-5ED31-0AA0 is a straightforward 125 amp, 3-pole breaker designed for solid, everyday protection in commercial and industrial setups. It’s rated at 35kA at 480V, so it’s built to handle higher fault levels without issues. This unit uses a thermal magnetic trip, which means you’re covered for both overloads and short circuits. The settings are fixed from the factory—overload is set at 125A and instantaneous trip is 10 times that—so there’s nothing to adjust. That’s usually a plus if you just want to install it and know it’s going to behave consistently. It’s part of the Siemens 3VA5 line, so it’s meant for modern distribution systems and standard panel applications. If you’ve worked with Siemens before, this will feel familiar.

Key Features and Benefits

• 125A rated current
• 35kA interrupting capacity at 480V
• 3-pole for three-phase systems
• Thermal magnetic trip (overload + short circuit protection)
• Fixed settings (no field adjustment needed)
• Instantaneous trip at 10x In
• Built on the 3VA52 frame

Technical Specifications

• Part Number: 3VA5212-5ED31-0AA0
  
• Amperage: 125A
  
• Poles: 3
  
• Voltage Rating: 480V
  
• Interrupting Rating: 35kA @ 480V
  
• Trip Unit: Thermal Magnetic (TM210)
  
• Overload Protection (Ir): 125A (fixed)
  
• Instantaneous Trip (Ii): 10x In
  
• Frame Type: 3VA52 (250 Frame)
  
• Dimensions:
  • Height: 9.65 in
  • Width: 6.3 in
  • Depth: 5.9 in

Material Compliance and Certifications

• Meets UL requirements for molded case circuit breakers. Built for standard compliance in U.S. commercial and industrial electrical systems.

Where It Works Best

• Good fit for panelboards, switchboards, and equipment protection in commercial buildings or industrial facilities. Commonly used in HVAC, machinery, and general power distribution where a 125A breaker with higher interrupting capacity is needed.