SIEMENS
SIEMENS BQ2B050 50 A 2-pole 120/240 V AC bolt-on circuit breaker
A 50 A two-pole bolt-on breaker rated 120/240 V AC with a 10 kA interrupting capacity for Siemens panelboards
- TypeCircuit Breakers
- 50 A two-pole protection for 120/240 V AC circuits
- 10 kA interrupting capacity handles high fault currents
- Bolt-on mounting fits Siemens BQ series panelboards
- Toggle actuator gives clear on/off indication
- Accepts 8 AWG to 4 AWG aluminium or 6 AWG copper conductors
SIEMENS BQ2B050 50 A circuit breaker
This SIEMENS BQ2B050 is a bolt-on miniature circuit breaker rated at 50 A for 120/240 V AC systems. It fits Siemens panelboards using the BQ series frame size of 125 A. The two-pole design uses a toggle actuator for manual switching. It is intended for standard branch-circuit protection in residential or light-commercial panels.
10 kA interrupting rating at 120/240 V AC
The single specification that decides fit is the maximum AIR rating of 10 kA at 120/240 V AC. This breaker will safely interrupt fault currents up to that level on a compatible Siemens panel. If the available fault current at the installation point exceeds 10 kA, this device is not suitable and a higher-rated breaker must be selected.
Lug terminals accept 8 AWG to 4 AWG aluminium
The bundled lug terminals define the wire range: minimum 8 AWG, maximum 4 AWG for aluminium conductors and 6 AWG for copper conductors. No additional accessories or software are included with this breaker. Installers must supply conductors within this range and torque the lugs to the panelboard manufacturer's specification.
Highlights
- 50 A two-pole protection for 120/240 V AC circuits
- 10 kA interrupting capacity handles high fault currents
- Bolt-on mounting fits Siemens BQ series panelboards
- Toggle actuator gives clear on/off indication
- Accepts 8 AWG to 4 AWG aluminium or 6 AWG copper conductors
Specifications
| Brand | Siemens |
|---|---|
| Model | BQ2B050 |
| Type | Circuit Breakers |
Questions about this item
What does the 50 A rating mean once the breaker is installed in a panel?
It will carry up to 50 A continuously and trip on overloads or short circuits above that level, protecting 120/240 V AC branch circuits fed from a Siemens panelboard.
How does the 10 kA AIR rating at 120/240 V AC limit what the breaker can interrupt?
The breaker is tested to safely clear faults up to 10 000 A at 120/240 V AC; it must not be applied where available fault current exceeds that value.
What space and wire sizes are needed to bolt this two-pole unit into a Siemens panel?
The breaker measures 2.0 in long by 3.0 in wide by 3.0 in deep, accepts 8 AWG to 4 AWG aluminium or 6 AWG copper lugs, and mounts on a bolt-on bus in a BQ-series panelboard.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
