Square D QHB120 Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
Square D QHB120 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Rated for 65kAIC at 120/240V, this single-pole 20A bolt-on device delivers superior short-circuit protection for commercial and industrial facilities. It installs firmly into Square D NQ panelboards. This specific model carries a Switching Duty (SWD) classification, permitting its use as a switch for 120V fluorescent lighting circuits. The integrated Visi-Trip window instantly alerts maintenance staff to tripped conditions, minimizing downtime during critical electrical faults.Specifications
| Brand | Square D |
|---|---|
| Part Number | QHB120 |
| Series | QHB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 65kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | NQ Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, High Interrupting Capacity, SWD Rated |
Product FAQs
6 answersWhat panelboards are compatible with the QHB120 circuit breaker?
This bolt-on breaker is designed for use in Square D NQ, NQO, and NQOD series panelboards. It is not compatible with standard QO plug-on load centers.
What is the recommended terminal tightening torque for the QHB120?
The pressure plate terminals on this 20A breaker should be torqued to 40.7 lb-in (4.6 N-m) for secure connections with 14-8 AWG copper or aluminum wire.
Is the Square D QHB120 rated for switching fluorescent lighting loads?
Yes, this 20A breaker carries a Switching Duty (SWD) rating, meaning it is approved for use as a regular switch for 120V fluorescent lighting circuits.
Does this breaker feature a visual trip indicator?
Yes, it includes the Square D Visi-Trip indicator. When the breaker trips, the handle moves to a center position and a highly visible red indicator appears in the window to help quickly identify the faulted circuit.
What is the difference between the QHB120 and a standard QOB120 breaker?
The primary difference is the short-circuit interrupting rating. The QHB120 is a high-interrupting breaker rated for 65kAIC at 120/240V, whereas a standard QOB120 is rated for 10kAIC. They share the same physical dimensions and bolt-on mounting style.
Is the QHB120 HACR rated for HVAC equipment?
Yes, this thermal-magnetic breaker is HACR type rated, making it suitable for group installation and protecting heating, air conditioning, and refrigeration equipment.
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