3VA5290-5EF31-0AA0 - MFAS 90 Amp Circuit Breaker

3VA5290-5EF31-0AA0 - MFAS 90 Amp Circuit Breaker

The Siemens 3VA5290-5EF31-0AA0 is a straightforward, no-nonsense circuit breaker built for real-world electrical systems. It’s rated at 90 amps with a 3-pole configuration, making it a practical fit for three-phase applications where you just need dependable protection without overcomplicating things. This unit uses a thermal magnetic trip, so it handles overloads and short circuits the way most contractors expect—nothing fancy, just proven protection that works. The overload is fixed at 90 amps, which means there’s no setup to worry about. Install it, wire it, and it’s ready to go. On the short-circuit side, it trips instantly at 10 times the rated current, helping limit damage when something goes wrong. With a 35kA interrupting rating at 480V, it’s capable of handling higher fault conditions found in commercial and light industrial setups. It’s part of Siemens’ 3VA5 line, which has a reputation for being consistent and easy to work with in the field.

Key Features and Benefits

• 90A rating for typical commercial and industrial loads
• 3-pole breaker for full three-phase coverage
• 35kA interrupting capacity at 480V
• Thermal magnetic trip—simple and widely used protection type
• Fixed overload setting (90A), no adjustments needed
• Instantaneous trip at 10x current for fast fault response
• Compact size that fits well in most panel layouts
• Built by Siemens, known for consistent electrical components

Technical Specifications

• Part Number: 3VA5290-5EF31-0AA0
• Series: 3VA52
• Amperage: 90A
• Poles: 3
• Interrupting Rating: 35kA @ 480V
• Trip Type: Thermal Magnetic (TM240, ATAM)
• Overload Protection (Ir): 90A (fixed)
• Instantaneous Protection (Ii): 10 × In
• Frame Size: 250
• Dimensions:
  • Height: 9.65 in
  • Width: 6.3 in
  • Depth: 5.9 in

Material Compliance and Certifications

• UL Listed for use in North American electrical systems
• Meets standard industry requirements for circuit protection
• Designed for line protection in low-voltage distribution setups

Where It Works Best

• Commercial buildings and tenant panels
• Equipment panels in light industrial settings
• Manufacturing lines that don’t need adjustable trip units
• Retrofit jobs where you want something reliable without extra setup
• General three-phase distribution where consistency matters