Square D QHB1201021 Miniature Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
Square D QHB1201021 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Part of the QO family, the Square D QHB1201021 is a single-pole, 20-amp miniature circuit breaker designed for commercial and industrial electrical systems. It provides reliable thermal-magnetic protection for branch circuits. This bolt-on breaker installs into Square D NQ panelboards. It accepts 14-8 AWG aluminum or copper wiring via pressure plate terminals. A factory-installed shunt trip allows for remote tripping, while the 65 kAIC rating ensures high-capacity fault interruption.Specifications
| Brand | Square D |
|---|---|
| Part Number | QHB1201021 |
| Series | QHB |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 65kA @ 120/240VAC |
| 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 | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| 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
7 answersWhich panelboards are compatible with the QHB1201021 circuit breaker?
This bolt-on breaker is designed exclusively for installation in Square D NQ series panelboards. It will not fit in standard QO load centers, which require plug-on breakers.
What does the 1021 suffix mean in the QHB1201021 part number?
The 1021 suffix indicates that the breaker comes with a factory-installed shunt trip. This allows the breaker to be tripped remotely via an external control signal, which is commonly used for emergency stops or automated safety shutdowns.
Can I use the QHB1201021 to replace a QOB1201021?
Yes. The QHB1201021 has the same physical dimensions, bolt-on mounting style, and shunt trip functionality as the QOB1201021. The difference is the interrupting rating. The QHB version provides a 65kAIC rating, while the standard QOB version is rated for 10kAIC.
What control voltage is required to operate the shunt trip on the QHB1201021?
The factory-installed shunt trip coil on this breaker is rated to operate on a control voltage of 120/208/240VAC to actuate the trip mechanism remotely.
What wire sizes are accepted by the terminals on this breaker?
The pressure plate terminals accommodate 14 AWG to 8 AWG wire and are rated for use with both aluminum and copper conductors.
How does the thermal-magnetic trip mechanism operate on this breaker?
The thermal-magnetic (LI) mechanism provides dual protection. A thermal element responds to prolonged overloads (Long-Time), while a magnetic element reacts immediately to short circuits (Instantaneous).
Why choose a bolt-on breaker like the QHB1201021 over a plug-on type?
Bolt-on breakers physically bolt to the panelboard busbar, providing a highly secure, vibration-resistant connection. This is typically required in commercial and industrial applications where equipment vibration or high fault currents could dislodge a standard plug-on breaker.
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