THQB2120 2-Pole Miniature Circuit Breaker, Single Unit, 20A, 120/240 VAC, 10 kA Interrupting Capacity, Thermal Magnetic Trip, Bolt-On Mounting, HACR Rated for Panels, Reverse Feed Capable

Single unit THQB2120 2-pole 20A breaker, 120/240VAC
✔️ Thermal magnetic trip, 10 kA interrupting capacity, bolt-on HACR rated

This single THQB2120 miniature circuit breaker protects two circuits in residential and light commercial panels and load centers for branch circuit protection.

✅ 2-pole, 20 A rating, 120/240 VAC, visible trip indicator
✅ 10 kA interrupting capacity, HACR rated, reverse feed capable
✅ Thermal magnetic quick-make/quick-break trip for fast fault clearing
✅ Bolt-on mounting for secure installation in panelboards and load centers
✅ Ideal for HVAC circuits, general branch protection, and residential service panels

💡 What interrupting capacity is required for 120/240 VAC residential panel breakers? A breaker should have interrupting capacity equal to or greater than the available fault current at the service point. Keep a safety margin when sizing breakers. - Calculate the available fault current from the utility or transformer, then choose a breaker with equal or higher kAIC rating. - Many modern homes accept 10 kAIC for typical panels, but longer service feeds or commercial sites often need higher ratings. - Use thermal magnetic trip breakers with visible trip indication for HVAC and motor loads to simplify maintenance and troubleshooting.