QF120A - Siemens 20 Amp 120 VAC 1 Pole Ground Fault Circuit Breaker Plug-In 10kA Interrupt Thermal Magnetic Trip

Product Overview

The Siemens QF120A is a 20 amp, 120 VAC, single‑pole plug‑in circuit breaker with integrated ground fault protection and a thermal‑magnetic trip mechanism.

Designed for use in compatible Siemens load centers that accept plug‑in breakers, the QF120A carries a 10 kA interrupting rating and provides combined overcurrent and ground fault protection in one device.

Key Features

• 20 Amp continuous rating at 120 VAC
• Single‑pole (1P) configuration for standard branch circuits
• Integrated ground fault protection (ground fault circuit breaker)
• Thermal‑magnetic trip mechanism for overload and short‑circuit protection
• Plug‑in mounting for compatible Siemens panels
• 10 kA interrupting rating (10,000 A)

What this breaker does

The QF120A combines branch‑circuit overcurrent protection with ground fault detection in a single plug‑in unit. It trips on sustained overloads (thermal element), immediate high‑current faults (magnetic element), and ground leakage above the device trip threshold.

• Protects personnel and equipment by detecting ground faults and interrupting the circuit.
• Provides both overload and short‑circuit protection via a thermal‑magnetic trip.

Electrical ratings and performance

Match the QF120A to branch circuits that require a 20 amp breaker at 120 volts AC. The device has a 10 kA interrupting rating, which indicates the maximum fault current it is rated to safely interrupt.

• Rated current: 20 A
• Voltage: 120 VAC
• Poles: 1 (single‑pole)
• Interrupting rating: 10,000 A (10 kA)

Mounting and panel compatibility

The QF120A is a plug‑in style breaker intended for use in Siemens load centers and panels that accept Siemens plug‑in breakers. Confirm physical and electrical compatibility with your panel before ordering.

• Plug‑in mounting — installs into compatible Siemens breaker positions
• Intended for use in panels designed for Siemens plug‑in breakers

Operation and trip behavior

This breaker uses a thermal‑magnetic trip mechanism: the thermal element provides time‑delayed trip for overloads, while the magnetic element provides instantaneous trip for high‑magnitude short circuits. Ground fault detection trips the breaker when leakage to ground exceeds the device threshold.

• Thermal element: responds to prolonged overloads
• Magnetic element: responds to instantaneous short‑circuit currents
• Integrated ground fault circuitry: trips on qualifying ground leakage

Before You Order

Confirm the model number and ensure your panel accepts Siemens plug‑in breakers before ordering. Verify that a 20 A, 120 VAC, single‑pole ground fault breaker with a 10 kA interrupting rating meets the circuit protection and code requirements for your installation.

• Confirm panel manufacturer and model for compatibility with plug‑in Siemens breakers.
• Verify the required trip characteristics and ground fault protection level for your application.
• Contact a qualified electrician for selection and installation guidance.

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for QF120A - Siemens 20 Amp 120 VAC 1 Pole Ground Fault Circuit Breaker Plug-In 10kA Interrupt Thermal Magnetic Trip. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.