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Siemens BQ2B050 50 A two-pole bolt-on breaker grey plastic toggle

SIEMENS

SIEMENS BQ2B050 50 A 2-pole 120/240 V AC bolt-on circuit breaker

SKU CH-NTN6-J0CZT

A 50 A two-pole bolt-on breaker rated 120/240 V AC with a 10 kA interrupting capacity for Siemens panelboards

  • Product 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.

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Price $155.99
Pricier than about 79% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSiemens
Model nameBQ2B050
Product typeCircuit 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.

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