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Siemens BQ2B12500S01 - Molded Case Circuit Breaker 125A 2P

Siemens
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Siemens BQ2B12500S01 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in industrial and commercial electrical systems. It features a 125A current rating and a 240V AC voltage rating, housed within a compact 125A/BQ frame with dimensions of 4.724" x 2.756" x 2.756" and a weight of 1.146 lb. This two-pole, bolt-on, thermal magnetic breaker is constructed for use in Siemens panelboards and offers a 10kA interrupting capacity at 240V, with protection functions including long-time and instantaneous trip. It complies with UL, CSA, and HACR standards and operates within a temperature range of -25°C to 70°C, featuring a lug terminal connection compatible with wire sizes from 8 AWG to 2 AWG for aluminum and 4 AWG for copper. The unit includes an integrated 120V shunt trip mechanism for remote tripping capabilities, making it suitable for applications requiring controlled disconnection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic Protection with Shunt Trip
  • Voltage Rating: 240V AC
  • Current Rating: 125A
  • Dimensions: 4.724" H x 2.756" W x 2.756" D (120mm x 70mm x 70mm)
  • Standards: UL Listed, CSA Certified, HACR Rated
  • Applications: Industrial and Commercial Electrical Distribution, Siemens Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Bolt-on
  • Coil Voltage Maximum: 120V (Shunt Trip)
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Shipping Dimensions: Unit Dimensions Apply
  • Phase: 1
  • Voltage: 240V AC
  • Amperage: 125A
  • AIC rating: 10kA @ 240V
  • Connection: Bolt-on
  • Poles: 2
  • Protection: Thermal Magnetic
  • Functions: Long Time and Instantaneous Trip
  • Frame Size: 125A/BQ
  • Trip Type: Thermal Magnetic
  • Panel Type: Siemens Panelboards
  • Breaker Type: Shunt Trip
  • Control Voltage Minimum: 120V (Shunt Trip)
  • Control Voltage Maximum: 120V (Shunt Trip)
  • MCM Size: Min. 8 AWG, Max. 2 AWG (Al) / 4 AWG (Cu)
  • Metal Type: Standard Breaker Housing
  • Panel Style: Compatible with Siemens
  • Bus Type: Standard
  • Certification: UL, CSA, HACR
  • Mounting: Bolt-on
  • Hz: 50/60 Hz
  • Terminal Connection: Lug
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single Phase
  • Standards: UL 489, CSA C22.2
  • Installation Type: Fixed
  • Breaker Frame: BQ Series, 125A Frame
  • Wire Size: AWG 1/0 to 2/0, AWG 2 to 1/0 (Al/Cu)
  • Circuit Breaker Mounting Style: Bolt-on


Product Identification
  • UPC: 783643088849
  • GTIN: 00783643088849