Siemens CQD320 - 20 A, 480 V, 3-Pole Circuit Breaker | AmpState

The Siemens CQD320 20A, 480V, 3-Pole molded case circuit breaker is engineered to protect 3-phase distribution with precision—delivering reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for enduring performance in commercial and industrial environments, this compact MCCB helps you optimize panel space without compromising safety or protection.

• Compact molded case design minimizes footprint and preserves valuable panel real estate, making it ideal for tighter electrical enclosures and retrofit projects.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overload and short-circuit conditions, helping to reduce nuisance trips and equipment downtime.
• 3-pole, 480V rating suited for 3-phase power systems common in commercial and light industrial settings, delivering dependable protection at higher voltages.
• OEM compatibility designed to work with matching Siemens panelboards and load centers, simplifying replacements and upgrades without mismatched components.
• Versatile application appropriate for residential-adjacent commercial spaces, office buildings, and light industrial applications where clean, predictable protection is essential.

What problems does the CQD320 solve? It provides immediate, coordinated protection for branch circuits, guarding sensitive equipment and reducing the risk of damage from overcurrent events. Its robust trip mechanism helps electricians maintain system uptime in critical distribution paths, even when space is limited in the panelboard.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: CQD320
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 20A
• Voltage Rating: 480V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Ideal for the following users electrical contractors, facilities managers, and service technicians who manage 3-phase 480V distributions in offices, retail spaces, data centers, or light manufacturing. If you’re upgrading an existing Siemens installation or stocking a reliable replacement part, the CQD320 delivers consistent performance you can trust.

Practical guidance for use - Install in compatible Siemens panelboards and load centers, following all manufacturers’ installation instructions. Verify proper alignment with your system’s voltage and phase requirements, and replace only with a CQD320 that matches the panel rating and fault-clearing characteristics of your distribution scheme. For long-term reliability, pair with approved Siemens accessories and maintain regular panel inspections to ensure continued protection of your critical circuits.

Whether you’re performing a routine upgrade, equipment refresh, or new construction, the Siemens CQD320 20A, 480V, 3-Pole molded case circuit breaker from AmpState offers compact protection with a precise thermal-magnetic trip, designed to keep 3-phase systems safe and efficient.