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

The ABB THQL21100P is a 100-amp, two-pole Q-Line circuit breaker for 120/240 V panels, built for reliable overload and short-circuit protection in residential and light commercial load centers. The THQL21100P is a plug-in, thermal-magnetic breaker from ABB’s Q-Line family, compatible with THQL load centers and designed to replace or upgrade existing two-pole breakers. Manufactured by ABB (including products formerly sold under GE and GE by ABB), this breaker is produced to meet industry safety standards and intended for use where 120/240 V, 100 A protection is required. Always verify authenticity and third-party certifications such as UL or Intertek before installation to ensure compliance and safety.

How does this breaker protect my electrical system?

The THQL21100P uses thermal-magnetic trip technology to respond to both sustained overloads and sudden short circuits. It isolates fault conditions quickly to reduce risk to wiring and attached equipment, and includes visible trip indication for faster diagnostics.

• 100 A two-pole rating for 120/240 V circuits.
• Thermal element for long-term overload protection.
• Magnetic element for fast short-circuit isolation.
• Clear trip flag for quick fault identification.

Will it fit my load center and how easy is installation?

Designed as a one-inch-per-pole Q-Line plug-in breaker, the THQL21100P installs into THQL-compatible load centers without special adapters. Its compact footprint and standard quick-make/quick-break mechanism simplify swap-outs or panel upgrades performed by qualified electricians.

• Fits THQL load centers and most Q-Line compatible panels.
• Standardized plug-in mounting for straightforward replacement.
• Compact one-inch per pole design saves panel space.
• Recommended installation by a licensed electrician to meet code.

What safety and compliance features should I expect?

ABB manufactures this breaker to meet applicable safety norms; look for third-party listing marks on the unit or product listing before purchase. ABB continues to produce GE-branded residential distribution products following its acquisition of GE’s Industrial Solutions business, and genuine units carry the appropriate logos and certification labels.

• Produced by ABB (includes GE by ABB lineage) with branded labels.
• Third-party certification (UL/Intertek) should be present on authentic units.
• Robust plastics and metal contacts for long-term mechanical reliability.
• Visible trip indicator to speed troubleshooting and maintenance.

Can this breaker be used outdoors or in special locations?

The THQL21100P is intended for installation inside compatible load centers or lighting panels and provides ground-fault protection where required by code only if the specific model includes that functionality. Always verify the breaker’s listed applications and consult local electrical code for required GFCI or AFCI protection in garages, bathrooms, or outdoor receptacles.

• Intended for indoor load center/panel installation.
• Check product listing for ground-fault or arc-fault capabilities if needed.
• Follow NEC/local code for outdoor or special location requirements.
• Licensed electrician should confirm correct breaker type for each circuit.

Who is this for? This breaker is suited for electricians, electrical contractors, and knowledgeable DIYers replacing or upgrading a two-pole circuit in residential or light commercial panels that accept Q-Line THQL breakers. Choose this ABB THQL21100P when you need a 100 A, 120/240 V two-pole thermal-magnetic device from a recognized manufacturer; verify compatibility, authenticity, and third-party listings before installation and contact ABB’s customer service or your distributor for warranty details.

FAQ

Q: Is the ABB THQL21100P compatible with all Q-Line panels?

A: It fits THQL-compatible Q-Line load centers, but confirm panel compatibility and bus type before purchase.

Q: Does this breaker include ground-fault protection?

A: Only models specifically listed as GFCI provide ground-fault protection; check the product listing or label.