Siemens QF120AH - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Siemens QF120AH 20A, 120V, 1-Pole Plug-In Molded Case Circuit Breaker from AmpState delivers reliable overcurrent protection for residential, commercial, and light industrial panels. Built for quick plug-in installation and easy replacement, it safeguards branch circuits from overloads and short circuits with precision.

At the core of the QF120AH is a thermal-magnetic trip unit that provides stable, repeatable protection across varying electrical conditions. The thermal element handles gradual overcurrent, while the magnetic element triggers fast on short circuits, helping to minimize damage and downtime.

Key advantages

• Fast, plug-in installation: A straightforward connection to compatible Siemens OEM loadcenters and panelboards means quicker servicing and less panel downtime.
• Precise protection you can trust: Thermal-magnetic trip maintains consistent trip performance, reducing nuisance trips while keeping circuits safe.
• 1-pole, 20A, 120V: Ideal for protecting individual branch circuits such as lighting, receptacles, and small appliances in a wide range of spaces.
• OEM compatibility: Engineered to work with matching Siemens load centers and panelboards for seamless integration.
• Versatile application: Suitable for residential, commercial, and light industrial environments where reliable safety matters.

Detailed specs at a glance

• Manufacturer: Siemens
• Part number: QF120AH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and scenarios

Use this 1-pole 20A breaker to protect individual circuits in a panelboard or load center—perfect for a dedicated lighting circuit, a kitchen small-appliance branch circuit, or a dedicated outlet run. Its plug-in design minimizes service time during upgrades or repairs, making it a practical choice for ongoing electrical maintenance. It’s also a reliable spare for field technicians who need a dependable replacement that fits existing Siemens systems.

Why it matters for your electrical system

With the Siemens QF120AH, you get dependable overcurrent protection that trips predictably when a fault occurs, helping to prevent insulation damage, fire risk, and equipment downtime. The plug-in mechanism supports quick swaps without disturbing adjacent breakers, reducing panel downtime during repairs or changes.

How to choose and where to buy

Part of Siemens’ trusted lineup, the QF120AH is designed for compatibility with matching OEM loadcenters and panelboards. For installations requiring quick sourcing and consistent performance across multiple panels, this 1-pole 20A breaker is a dependable choice in the AmpState catalog.