3VA5330-7EF31-0AA0 - 300A Class CJAS 3-Pole Circuit Breaker

3VA5330-7EF31-0AA0 - 300A Class CJAS 3-Pole Circuit Breaker

The Siemens 3VA5330-7EF31-0AA0 is a 3-pole, 300-amp thermal magnetic circuit breaker designed for standard commercial and industrial use. It’s part of the 3VA5 series, so it’s built for consistent performance in everyday power distribution—not overcomplicated, just reliable. You’ve got some flexibility with this one. The overload setting can be adjusted between 240A and 300A, which helps when your load isn’t perfectly fixed. The instantaneous trip range (5x to 10x) also gives you some control over how the breaker reacts to faults, which can help reduce nuisance trips. It uses a 400A frame, so there’s some built-in margin, and the size is typical for this class—nothing unusual to deal with during installation.

Key Features and Benefits

• Adjustable overload range: 240A–300A
• Thermal magnetic protection: Thermal magnetic protection (overload + short circuit)
• Instantaneous trip setting: 5x–10x
• 3-pole: 3-pole for three-phase systems
• Frame size: 400A frame size
• Design: Standard, easy-to-fit design

Technical Specifications

• Part Number: 3VA5330-7EF31-0AA0
• Series: Siemens 3VA5
• Poles: 3
• Amps: 300A
• Frame Size: 400A
• Overload (Ir): 240A – 300A
• Instantaneous (Ii): 5x – 10x In
• Interrupting Class: C (CJAS)
• Voltage: Up to 480V AC
• Dimensions: 9.8" H x 6.3" W x 5.9" D
• Lugs: Not included

Material Compliance and Certifications

• UL Listed
• Meets standard U.S. safety requirements
• Suitable for NEC applications when installed correctly

Where It Works Best

This is a straightforward fit for commercial panels, industrial equipment, and general power distribution. It’s typically used anywhere you need a dependable 300A breaker with a bit of adjustability—nothing specialized, just solid, everyday use.