Siemens CQD380 - 80 A, 480 V, 3-Pole Circuit Breaker | AmpState

Siemens CQD380 is a compact, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With an 80A rating and 480V operating capacity, it’s built to handle demanding commercial and light industrial environments while fitting neatly into tighter panel layouts.

• Space-saving molded case design minimizes panel footprint and simplifies installation, freeing up valuable space for wiring and labeling while maintaining robust protection.
• Thermal-magnetic trip unit provides stable, repeatable protection across varying temperatures and loads. The magnetic element delivers an instantaneous response for high-fault events, helping limit damage and downtime.
• OEM-ready compatibility designed to pair with matching Siemens OEM load centers and panelboards, ensuring proper coordination, reliable performance, and straightforward maintenance or replacement.
• Versatile applications suitable for residential, commercial, and light industrial use where 480V three-phase systems are common — ideal for feeders to subpanels, main distribution panels, or service disconnect points.

Technical snapshot

• Manufacturer: Siemens
• Part number: CQD380
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 80A
• Voltage rating: 480V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this matters for your electrical design and maintenance:

• Reliable protection under varying load—the thermal element handles gradual overloads while the magnetic element delivers rapid interruption on severe faults, reducing the risk of equipment damage and unplanned outages.
• Coordinated performance—built to align with compatible Siemens panels, ensuring predictable trip characteristics and smooth retrofits or upgrades without panel mismatches.
• Panel efficiency—the compact form factor supports cleaner, more organized installations, which can simplify labeling, inspection, and future expansion.

Use cases and scenarios

• 80A feeders supplying subpanels or critical loads in commercial facilities such as offices, retail spaces, or data/communication rooms
• Residential service panels requiring robust 3-pole protection for multi-wire branch circuits and shared neutrals
• Light industrial panels handling 480V three-phase circuits for motors, HVAC, lighting, and processing equipment

Practical installation notes:

• Ensure the CQD380 is paired with an OEM-compatible Siemens load center or panelboard to maintain proper coordination and protection performance.
• Follow local electrical codes and safety practices during installation, testing, and maintenance of the device.