Siemens CQD150 - 50 A, 277 V, 1-Pole Circuit Breaker | AmpState

Meet the Siemens CQD150 — a compact, reliable 50 A, 277 V, 1-pole molded case circuit breaker designed to safeguard branch circuits in panelboards and loadcenters. Built for dependable overcurrent and short-circuit protection, this unit helps keep electrical systems on cue and prevent damage to wiring and equipment.

Why this breaker stands out

• Compact molded-case design maximizes panel space, making it easier to fit additional circuits in tight panels without sacrificing protection.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across a range of temperatures and load conditions, reducing nuisance trips and ensuring consistent protection.
• OEM-compatible designed to work seamlessly with matching Siemens OEM load centers and panelboards, simplifying selection and installation for upgrades or replacements.
• Versatile application suitable for residential, commercial, and light industrial environments where reliable single-pole protection is needed.

What problems does it solve?

• Prevents damage from overloaded or short-circuited single-leg circuits by interrupting excessive current at 50 A.
• Helps maintain safe operation in panelboards and loadcenters by providing predictable, trip-time behavior under varying electrical loads.
• Facilitates efficient panel design with a space-saving form factor that leaves room for essential circuits in multifunction installations.

Specs at a glance

• Manufacturer: Siemens
• Part Number: CQD150
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50 A
• Voltage Rating: 277 V
• Number of Poles: 1
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or expanding panelboards in commercial spaces with 277 V lighting or power distribution.
• Installing in residential settings that rely on Siemens panel systems for reliable single-pole protection.
• Light industrial applications requiring compact protection for individual branch circuits while preserving panel space.

With the CQD150, you gain a dependable, space-efficient solution that pairs precise protection with straightforward compatibility. If you’re stocking or upgrading Siemens panelboards and loadcenters, this 1-pole 50 A breaker helps you maintain safe, efficient electrical distribution across a variety of settings.