Siemens Q120H - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

The Siemens Q120H is a 20A, 120V, 1-pole plug-in molded case circuit breaker engineered to deliver fast, dependable protection for branch circuits in panelboards and loadcenters. Designed to fit seamlessly into compatible Siemens systems, it helps keep residential, commercial, and light industrial electrical installations safe and reliable.

Experience quick, hassle-free service with a fast plug-in connection that simplifies installation and replacements. This means less downtime during panel upgrades, routine maintenance, or circuit servicing, so you can get power back online without lengthy downtime.

The thermal-magnetic trip unit provides stable, repeatable protection against overcurrent and short-circuit events. By combining thermal and magnetic sensing, it responds to gradual heat buildup and sudden fault currents, helping protect wiring, devices, and downstream equipment from damage.

Designed for compatibility with matching OEM Siemens load centers and panelboards, the Q120H ensures a proper fit, consistent trip performance, and streamlined maintenance. Its one-pole 20A configuration is ideal for dedicating protection to individual branch circuits without complicating the panel layout.

Technical specifications

• Manufacturer: Siemens
• Part Number: Q120H
• 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 practical considerations

• Ideal for protecting individual branch circuits in residential panels, small offices, retail spaces, and light industrial panels.
• Serves as a reliable replacement for worn or trip-issues on compatible Siemens panelboards and loadcenters.
• Supports quick maintenance cycles—swap in a matching Q120H to restore circuit protection with minimal downtime.
• Ensure compatibility with your Siemens OEM load center before installation; always power down the main and follow local electrical codes. When in doubt, consult a licensed electrician.

Choose the Siemens Q120H for a straightforward, dependable path to safeguarding your circuits with a plug-in, OEM-compatible solution that performs consistently across residential, commercial, and light industrial environments.