Siemens HQ2B050 Miniature Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Quantity
Siemens HQ2B050 - 50A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Description
Providing robust protection for commercial and industrial systems, the Siemens HQ2B050 is a 2-pole, 50A miniature circuit breaker. It features a fixed thermal-magnetic trip unit to safeguard critical branch circuits. Engineered for a secure connection, this bolt-on breaker installs into Siemens panelboards. It accepts 8-6 AWG copper or 8-4 AWG aluminum wire. This unit is officially replaced by the HBQ2B050. It delivers a high interrupting capacity of 65kAIC at 240VAC and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQ2B050-R |
| Series | HQ |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG (Cu), 8 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | UL 489, CSA C22.2 No. 5, HACR Rated |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated, Common Trip, Non-Interchangeable Trip |
Product FAQs
4 answersIs the Siemens HQ2B050 still in active production?
No, the HQ2B050 is a legacy miniature circuit breaker. It has been officially replaced by the Siemens HBQ2B050, which shares the same physical dimensions, bolt-on mounting, and 65kAIC interrupting capacity.
What type of panelboards accept the HQ2B050 circuit breaker?
This bolt-on breaker is designed exclusively for use in compatible Siemens commercial and industrial panelboards that accept BQ or HQ frame types. It is not compatible with standard residential load centers that require plug-on QP style breakers.
Is the HQ2B050 suitable for use with heating, ventilation, and air conditioning equipment?
Yes, this breaker is HACR rated, making it fully approved for use with multi-motor and combination-load HVAC equipment that requires a 50A overcurrent protection device.
How does the thermal-magnetic trip unit function on this breaker?
The fixed thermal element provides long-time protection against sustained overloads by heating up and tripping the breaker. The magnetic element delivers instantaneous protection, clearing severe short circuits up to the 65kAIC maximum rating.
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