CQD350 - 50Amp Circuit Breaker

CQD350 - 50Amp Circuit Breaker

If you’re working with an existing Siemens CQD panelboard system, the CQD350 is the kind of component that keeps everything aligned the way it was originally designed. This is a 50 amp, 3-pole molded case circuit breaker built for 480/277V applications, commonly used in commercial and industrial electrical distribution where consistency across the panel matters.

In day-to-day use, you’ll typically see this breaker supporting three-phase branch circuits, lighting loads, and general power distribution. The 50A rating makes it a solid fit for mid-range electrical loads, while the 14kA interrupt rating provides standard protection for fault conditions in systems of this class. It’s not about changing the system—it’s about keeping it running the way it was intended.

Because it’s part of the CQD family, it’s often chosen for replacement or maintenance work, where matching the original setup is important for compatibility and long-term system stability.

Installation stays simple thanks to the DIN rail mounting design, which helps keep panels clean, organized, and easier to service when needed.

Key Features and Benefits

• Siemens CQD series breaker designed for existing panelboard systems
• 50A, 3-pole configuration for 480/277V applications
• 14kA interrupt rating for standard commercial protection needs
• DIN rail mounting for straightforward installation
• Commonly used in three-phase distribution and lighting circuits
• Ideal for maintaining compatibility in installed CQD systems
• Supports consistent panel design across existing electrical setups
• Helps simplify maintenance and future replacement work
• Compact footprint for organized panel layouts

Technical Specifications

• Model: CQD350
• Series: Siemens CQD
• Amperage: 50A
• Poles: 3
• Voltage Rating: 480/277V AC
• Interrupt Rating: 14kAIC
• Mounting Type: DIN rail
• Application: Branch circuit protection in CQD systems

Material Compliance and Certifications

Manufactured in accordance with applicable UL and IEC standards for molded case circuit breakers used in commercial electrical installations. Installation should be performed by a qualified electrician following all local electrical codes and safety requirements.

Where It Works Best

• Existing Siemens CQD panelboard systems
• Commercial lighting and power distribution circuits
• 480V three-phase electrical systems
• 277V lighting control applications
• Maintenance and like-for-like breaker replacement work
• Industrial and commercial control panels
• DIN rail based electrical enclosures
• Facilities aiming to maintain consistent legacy panel configurations