CQD120 - 20Amp Circuit Breaker

CQD120 - 20Amp Circuit Breaker

The CQD120 Siemens CQD miniature circuit breaker is a 20 Amp, 1-pole breaker used in everyday commercial and industrial electrical panels where individual 277V circuits need reliable protection. You’ll typically see this type of breaker in lighting panels, control cabinets, and distribution boards, especially in buildings that rely on organized DIN rail layouts for clean installation and easy maintenance.

This unit is rated for 277VAC applications and provides a 14kA interrupting capacity, making it suitable for standard branch circuit protection in commercial environments. The compact 1-pole design helps save space inside tight panels while still handling the everyday lighting and control loads these systems depend on.

At the end of the day, it’s a simple, familiar breaker that does a very specific job—keeping individual circuits protected in panels where consistency, space savings, and easy replacement matter.

Key Features and Benefits

• 20 Amp, 1-pole breaker for 277V branch circuits
• Designed for Siemens CQD DIN rail systems
• 14kA interrupting rating for standard protection needs
• Compact design for tight panel spaces
• DIN rail mount for quick installation and replacement
• Common in lighting and control panel applications
• Used in commercial and industrial electrical systems
• Suitable for maintenance, retrofit, and new installations
• Supports organized multi-breaker layouts
• Straightforward branch circuit protection

Technical Specifications

• Catalog Number: CQD120
• Product Type: Miniature Circuit Breaker
• Series: CQD
• Amperage Rating: 20A
• Poles: 1
• Voltage Rating: 277VAC
• Interrupting Rating: 14kA
• Mounting Type: DIN Rail
• Application: Branch circuit protection
• Net Weight: approx. 0.741 lb

Material Compliance and Certifications

The CQD120 Siemens breaker is built to applicable UL and IEC standards for low-voltage circuit protection equipment. It is intended for installation in compatible DIN rail enclosures and should always be installed by qualified electrical personnel in accordance with applicable electrical codes and manufacturer guidelines.

Where It Works Best

• Commercial lighting panels
• Industrial control cabinets
• 277V branch circuit systems
• DIN rail distribution boards
• Electrical panel maintenance and upgrades
• Building automation systems
• Tight-space electrical enclosures
• Siemens-compatible installations