ABB 100A Two-Pole Circuit Breaker THQL21100P 120/240V Q-Line — Thermal-Magnetic Plug-In

The ABB THQL21100P is a Q-Line, 100-amp, two-pole 120/240V circuit breaker built for reliable overload and short-circuit protection in residential and light commercial panels.

This ABB-manufactured THQL series breaker replaces or upgrades two-pole circuits in compatible load centers, delivering thermal-magnetic protection with a compact Q-Line footprint. It’s designed to fit THQL slots, offers quick-make/quick-break operation, and includes clear trip indication for fast diagnostics. ABB continues production of GE legacy residential distribution products, so this part carries modern manufacturing and third-party certification expectations when supplied as an authentic ABB or GE by ABB item.

How does the THQL21100P protect my electrical system?

The breaker combines thermal and magnetic trip elements to respond to both overloads and short-circuit conditions. As a two-pole device it simultaneously disconnects both hot legs on a 120/240V circuit for safer fault clearing. It also provides visible trip indication so you can quickly identify a faulted circuit.

• 100 amp continuous rating per device for heavy loads
• Two-pole design interrupts both hot conductors on faults
• Thermal-magnetic trip for combined overload and short-circuit response
• Quick-make/quick-break mechanism for reliable switching

Will this breaker fit my panel and how easy is installation?

The THQL21100P installs into Q-Line (THQL) load centers that accept plug-in style two-pole breakers. Its 1-inch-per-pole width keeps full use of panel space, and the design is familiar to electricians and competent DIYers. Always confirm panel model compatibility and follow electrical codes and safety procedures when installing.

• Fits THQL-type load centers and lighting panels
• Compact Q-Line footprint saves breaker space in the panel
• Plug-in mounting for straightforward replacement or upgrade
• Follow NEC requirements and local code for installation and GFCI needs

What certifications and authenticity checks should I look for?

Buyers should verify the product label and listing to ensure it is described as ABB, GE, or GE by ABB and shows the manufacturer logo. Certified products often include third-party marks from bodies such as UL or Intertek; confirm certification and packaging to avoid counterfeit merchandise that may not meet safety standards.

• Confirm ABB or GE by ABB markings on labels and packaging
• Look for third-party certification marks like UL or Intertek
• Check photos and product descriptions for consistent model numbers
• Contact ABB customer service for warranty or authenticity questions

Why choose a Q-Line two-pole breaker instead of a different style?

Q-Line breakers like the THQL21100P are purpose-built for panels accepting THQL plug-in devices, offering compact sizing and proven thermal-magnetic operation. They provide a straightforward replacement option for existing Q-Line systems and are widely used in residential and light commercial applications where reliable two-pole protection is required.

• Designed specifically for Q-Line/THQL panel systems
• Space-efficient one-inch-per-pole design
• Recognizable mechanical operation and visual trip indication
• Suitable for heavy loads in residential and light-commercial settings

Who is this for: Electricians, electrical contractors, and knowledgeable homeowners who need a dependable 100A two-pole breaker that fits THQL/Q-Line panels. Choose this ABB THQL21100P when replacing aging breakers, upgrading circuits to handle higher amperage loads, or maintaining a panel populated with Q-Line devices. Always confirm panel compatibility, local code requirements, and use certified parts from reputable sellers to ensure safety and performance.