SIEMENS
3VA5330-5EF31-0AA0 - 300A Class MJAS 3-Pole Circuit Breaker
3VA5330-5EF31-0AA0 - 300A Class MJAS 3-Pole Circuit Breaker
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3VA5330-5EF31-0AA0 - 300A Class MJAS 3-Pole Circuit Breaker
The Siemens 3VA5330-5EF31-0AA0 is a 300 amp, 3-pole breaker built for straightforward, reliable protection in commercial and industrial setups. It’s part of the 3VA5 line, so you’re getting a newer-generation design that’s made to handle real-world conditions without being overly complicated. This unit uses a thermal magnetic trip. In plain terms, it protects against both overloads and sudden faults. You’ve also got an adjustable range on the overload side (240A–300A), which helps when you’re dialing things in for a specific application instead of being stuck with a fixed setting. With a 35 kA rating at 480V, it’s ready for higher fault levels you typically see in larger panels or equipment. It’s built on a 400A frame, so you’ve got some headroom in the design. Just keep in mind—lugs aren’t included. If you’re replacing an existing breaker or setting up a new panel and need something dependable without overthinking it, this one checks the boxes.
Key Features and Benefits
- 300 amp rating: for standard commercial/industrial loads
- 3-pole setup: for three-phase systems
- Thermal magnetic trip: for both overload and short-circuit protection
- Adjustable overload (240A–300A): for better fit in the field
- Instant trip range: of 5–10x for fault conditions
- 35 kA interrupting rating: at 480V AC
- 400A frame: gives added durability
- Part of Siemens’ 3VA5 series
Technical Specifications
- Part Number: 3VA5330-5EF31-0AA0
- Type: 3VA53
- Amperage: 300A
- Poles: 3
- Frame Size: 400A
- Trip Unit: Thermal Magnetic (TM240)
- Overload Range (Ir): 240A – 300A
- Instantaneous (Ii): 5–10x
- Interrupting Rating: 35 kA @ 480V AC
- Dimensions: 9.8" H × 6.3" W × 5.9" D
- Lugs: Not included
Material Compliance and Certifications
- UL listed
- Suitable for use in systems following NEC guidelines
- Built to standard Siemens manufacturing specs
Where It Works Best
- Commercial panels
- Industrial equipment
- Motor and line protection
- Panel upgrades and replacements
- General three-phase distribution
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