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Siemens BQ series miniature circuit breaker, two-pole toggle, bolt-on mount, grey plastic housing

SIEMENS

SIEMENS BQ2B015 Miniature Circuit Breaker 15A 2 Pole 120/240V AC

SKU CH-CZZR-2BHCX

A 15 A, two-pole miniature circuit breaker rated 120/240 V AC with a 10 kA interrupting rating for Siemens panelboards

  • 15 A protection for single-phase 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents safely
  • Bolt-on mounting fits Siemens panelboards directly
  • Toggle actuator gives clear on/off indication
  • Terminal lugs accept 14–10 AWG copper or 12–10 AWG aluminium

BQ Series 15 A Two-Pole Breaker

The Siemens BQ2B015 is a bolt-on miniature circuit breaker rated at 15 A and 120/240 V AC. It fits single-phase Siemens panelboards that accept the BQ frame size of 125 A. The toggle actuator provides clear on-off indication for residential and light-commercial circuits.

Replaces Worn Single-Pole or Lower-Rated Units

Swap this breaker in when an existing single-pole device no longer supplies both legs of a 240 V load or when a 10 A or 12 A breaker trips under normal demand. The 10 kA interrupting rating at 120/240 V AC handles available fault current in typical service entrances. Upgrade only if the panelbus accepts BQ-series bolt-on mounting and the load requires two poles.

15 A Continuous Capacity with 10 AWG Maximum

Copper conductors up to 14 AWG and aluminium up to 12 AWG terminate in the lug terminals; the largest accepted wire is 10 AWG. The breaker carries 15 A continuously at up to 104 °F ambient without nuisance tripping. Circuits drawing more than 15 A or requiring a higher AIC rating need a different frame size or series.

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Price $131.99
Pricier than about 75% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

What panelboard depth does the 2 in by 3 in by 4 in bolt-on frame require?

The breaker body measures 2 in long, 3 in wide and 4 in deep, so the panelboard must provide at least 4 in of clear mounting depth behind the cover.

Which torque value should be used when tightening the lug terminals on 12 AWG aluminium or 14 AWG copper conductors?

Torque the lug screws to the manufacturer’s specified inch-pounds for the wire size used; under-torquing is the most common installation error and can cause overheating.

When should the breaker be replaced if it operates near the 104 °F maximum ambient temperature?

Plan replacement after 10 to 15 years of continuous service at elevated temperature, or sooner if nuisance tripping or discoloration appears on the lugs.

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