Siemens CQD3100 - 100 A, 480 V, 3-Pole Circuit Breaker | AmpState

The Siemens CQD3100 is a 100 A, 480 V, 3-pole molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Built for seamless integration with Siemens OEM systems, this compact MCCB balances space efficiency with robust electrical protection for demanding installations.

• Compact molded-case design maximizes panel space, enabling clean, organized distributions in tight electrical rooms or equipment racks.
• Thermal-magnetic trip unit delivers stable, repeatable protection by addressing both continuous overloads and instantaneous short circuits, reducing nuisance trips and protecting wiring insulation.
• 3-pole configuration ideal for 3-phase systems, simplifying wiring and improving fault isolation in commercial or light industrial panels.
• OEM-compatible engineered to pair with matching Siemens load centers and panelboards for quick, plug-in reliability without adapters or modification.
• Versatile application suitable for residential, commercial, and light industrial environments where dependable protection and efficient space use matter.

Key specifications

• Manufacturer: Siemens
• Part number: CQD3100
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 100 A
• Voltage rating: 480 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical scenarios

In a commercial distribution panel, the CQD3100 protects three-phase feeders feeding lighting and receptacle circuits, ensuring rapid disconnection during a fault and minimizing damage to downstream equipment. In a light-industrial setting, it safeguards motor and control circuits where compact footprint is essential for dense panel layouts. Its compatibility with Siemens panelboards means technicians can implement a reliable protection solution without reworking existing bus barriers or mounting hardware.

Why this matters

Choosing the CQD3100 means opting for a protection device that combines precise electro-mechanical performance with installation simplicity. The thermal-magnetic trip yields predictable, fast response to faults, while the 3-pole design reduces wiring complexity for multi-phase loads. OEM compatibility translates to faster assemblies, fewer compatibility concerns, and a cleaner, more maintainable panel architecture over time.

Installation and care tips

Install in accordance with local electrical codes and Siemens installation guidelines. Verify that the panelboard rating supports 480 V operation and that mounting and bus connections align with the panel’s specifications. Periodic inspection for signs of overheating and routine trip-testing with proper equipment will help ensure reliable operation and long service life.

The Siemens CQD3100 delivers trusted protection for three-phase branch circuits in a compact form factor, making it a practical, dependable choice for modern electrical distributions in homes, businesses, and light industrial facilities.