Siemens 3VA5120-4EF31-0AA0 20A 3P 480V Circuit Breaker | AmpState

Siemens 3VA5120-4EF31-0AA0 is a purpose-built circuit breaker designed for everyday electrical work, delivering reliable circuit protection in panelboards, load centers, and electrical distribution networks. Built to handle routine protection tasks, this 3-pole device ensures consistent performance across demanding environments.

Ideal for maintenance teams, panel builders, and spare inventory where a precise part-number match matters, this breaker enables fast, accurate replacements. With a 20 A rating and 480 V operating capacity, it supports three-phase distribution systems common in commercial and industrial setups.

• Manufacturer: Siemens
• Part Number: 3VA5120-4EF31-0AA0
• Type: Circuit Breaker
• Amperage: 20 A
• Poles: 3
• Voltage: 480V
• Applications: Panelboards, Load Centers, Electrical Distribution
• Availability: From AmpState

Why this Siemens breaker stands out is its direct compatibility with Siemens panel systems and its readiness for rapid deployment in the field. The 3-pole design provides balanced protection across all three phases, helping to safeguard motors, feeders, and other heavy-load components in 480V circuits. Its robust construction is geared toward long service life in environments where breakers are subject to frequent cycling and routine maintenance checks.

Practical use cases and benefits

• Replacement in existing Siemens panelboards and load centers without the need for adapters or rewiring.
• Spare part option to reduce downtime during preventive maintenance or after unexpected trips.
• Reliable protection for three-phase equipment and distribution circuits in industrial facilities, mid-size commercial buildings, and high-demand electrical rooms.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.