Siemens QL1 - Circuit Breaker | AmpState

Meet the Siemens QL1 molded case circuit breaker—a compact, dependable solution built for branch circuit overcurrent and short-circuit protection inside panelboards and loadcenters. Designed to maximize panel space without compromising protection, the QL1 delivers reliable performance where it matters most.

• Compact molded case design: Frees valuable space in your panel while delivering full protection capacity.
• Thermal-magnetic trip unit: Combines precise thermal sensing with magnetic instantaneous response for stable, repeatable protection across a range of fault conditions.
• OEM-compatible: Engineered to work seamlessly with matching Siemens OEM loadcenters and panelboards for a clean, reliable fit and consistent operation.
• Versatile for multiple environments: Suitable for residential, commercial, and light industrial applications where dependable branch-circuit protection is essential.

Product specifics

• Manufacturer: Siemens
• Part Number: QL1
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

The QL1 is a practical choice when wiring a new panel or upgrading an existing distribution board. It excels for protecting circuits in homes, small offices, retail spaces, and light industrial setups—covering lighting, receptacle banks, and small equipment loads. Its thermal-magnetic mechanism provides balanced sensitivity to gradual overloads while delivering prompt interruption on short circuits, helping you minimize damage and downtime.

Why this matters for your electrical distribution

Space efficiency and protection reliability go hand in hand in modern panels. The QL1’s compact design helps you maximize usable panel area, while the precise trip mechanism reduces nuisance trips and guards equipment against damaging faults. With Siemens engineering behind it and compatibility with matching loadcenters and panelboards, the QL1 offers a straightforward, durable solution for safe, code-compliant circuit protection.