Siemens CQD135 - 35 A, 277 V, 1-Pole Circuit Breaker | AmpState

The Siemens CQD135 is a dependable 35A, 277V, 1-pole molded case circuit breaker designed to protect branch circuits in panelboards and loadcenters. With its compact form and precise protection, it’s an ideal upgrade or replacement for residential, commercial, and light industrial electrical systems that demand consistent performance and quick trip responses.

Why the CQD135 stands out

• Compact molded case design: Maximizes panel space while delivering solid protection, making it easier to fit into tight electrical enclosures.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection across varying temperatures and loads, helping prevent nuisance trips and ensuring the right breaker trips when it matters.
• OEM-compatible installation: Designed to be compatible with matching Siemens loadcenters and panelboards, enabling straightforward replacement or expansion without custom adapters.
• Versatility across sectors: Suitable for residential panels, commercial electrical rooms, and light industrial applications where 277V branch circuits are common.
• Reliable 1-pole protection: Ideal for single-phase branch circuits that require precise overcurrent and short-circuit protection at 277V.

Ideal use cases

Use the CQD135 when you need dependable protection for a 35A, single-pole circuit on 277V. It’s a solid choice for lighting circuits in commercial spaces, receptacle or small equipment feeds in office environments, or any 277V branch circuit that benefits from Siemens’ proven protection technology. If you’re upgrading an older panel or expanding a panelboard, this breaker offers a compatible, performance-driven option that aligns with existing Siemens systems.

Compatibility and installation

To maximize reliability and ease of service, choose the CQD135 for Siemens panelboards or loadcenters that specify a 1-pole, 35A, 277V molded case breaker. Always confirm that the replacement part matches the panel’s documented compatibility and the circuit’s amperage requirements. Installation should follow standard electrical safety practices, with the main power off and the breaker seated firmly into the bus and terminal connections correctly torqued per manufacturer guidelines.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: CQD135
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 35A
• Voltage Rating: 277V
• Number of Poles: 1
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re stocking up for panel maintenance, performing a controlled upgrade, or assembling parts for a commercial electrical install, the Siemens CQD135 delivers reliable protection with a design that integrates seamlessly into Siemens panel ecosystems. Available through AmpState, it’s a practical, field-ready solution for clean, predictable electrical protection.