CQD290 - 90Amp Circuit Breaker

CQD290 - 90Amp Circuit Breaker

The Siemens CQD290 is a 2-pole, 90 amp circuit breaker built for 480/277V electrical systems, commonly found in commercial Siemens CQD panelboards. In most cases, it’s used when a breaker needs to be replaced inside an existing setup—where the priority is keeping everything consistent and getting the circuit back online without changing the panel layout.

You’ll typically see this breaker in commercial lighting systems, branch distribution panels, and building electrical rooms. The 90A rating supports higher-load circuits, while the 14kA interrupt rating provides standard protection for faults in this voltage class. It’s not a complicated piece—it’s a practical fit for systems that are already in place and need a matching component that works the way the original did.

Because it’s DIN rail mounted, installation stays simple and clean. It slots into the existing panel layout and makes maintenance or replacement work a lot more straightforward when service time comes around.

Key Features and Benefits

• Siemens CQD series breaker for existing panel systems
• 90 amp, 2-pole configuration for 480/277V applications
• 14kA interrupt rating for standard commercial protection
• DIN rail mounting for quick installation and clean layout
• Commonly used in lighting and branch circuit distribution
• Designed for like-for-like replacement in CQD systems
• Helps keep maintenance and repairs straightforward
• Compact design that fits neatly in organized panels
• Supports quick swap-outs during service work

Technical Specifications

• Model: CQD290
• Series: Siemens CQD
• Amperage: 90A
• Poles: 2
• Voltage Rating: 480/277V AC
• Interrupt Rating: 14kAIC
• Mounting Type: DIN rail
• Application: Branch circuit protection

Material Compliance and Certifications

Built to meet applicable UL and IEC standards for molded case circuit breakers used in commercial electrical distribution systems. Installation should be performed by qualified personnel in accordance with local electrical codes and safety requirements.

Where It Works Best

• Siemens CQD panelboard systems already in service
• Commercial lighting circuits (277V applications)
• 480V branch and distribution panels
• Facility maintenance and breaker replacement work
• Commercial buildings and electrical rooms
• DIN rail panel layouts where space and organization matter
• Like-for-like CQD replacements in existing installations