Siemens | CQD170 | Circuit Breaker | 70A | 1-Pole | 277V

Meet the Siemens CQD170 circuit breaker—a purpose-built, 70-amp, 1-pole protection device designed for 277-volt systems. Built for reliability in maintenance, retrofit, and replacement projects, this breaker delivers precise protection where exact specs matter.

Key reasons to choose CQD170

• Amperage: 70A so you can safeguard high-load single-circuit feeds common in commercial environments.
• Pole configuration: 1-Pole design for straightforward single-phase protection on 277V circuits.
• Voltage rating: Rated for 277V operation, making it ideal for lighting and small equipment circuits in many commercial buildings.
• Clear reference for compatibility: The part number CQD170 is the best reference when matching breakers to the panel family and existing equipment.
• Maintenance, retrofit, and replacement: Specifically suited for upgrading or replacing worn or outdated breakers in 277V systems.
• Fit confirmation: Always verify fit and ratings against your panel labeling before ordering to ensure seamless compatibility.

Ideal use cases

• Retrofits in commercial panels where 277V single-pole protection is required for lighting or small loads.
• Replacement of aging or failed 70A, 1-pole breakers in 277V distribution circuits.
• New installations or panel upgrades that specify CQD170 as the exact Siemens reference for compatibility.

What matters to you with this breaker

The CQD170 isn’t just a spec sheet entry—it’s a precise, dependable component that helps you maintain system uptime and safety. With the exact 70A rating and 1-pole configuration, it protects the most common 277V feeds without unnecessary complexity. By prioritizing the correct part number as your compatibility guide, you reduce the risk of mismatch and installation delays.

Practical guidance for installation and maintenance

• Before ordering, cross-check the panel’s labeling and the CQD170 reference to confirm exact compatibility.
• Ensure your 277V system matches the 1-pole, 70A protection profile to avoid nuisance tripping or under-protection.
• Store and handle breakers in a dry environment and install them with standard industry torque specifications to maintain secure connections.
• Use this breaker in accordance with local electrical codes and panel manufacturer guidelines for safe and compliant operation.