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Siemens BL series miniature circuit breaker, single-pole toggle, grey plastic body, bolt-on mounting, lug terminals

SIEMENS

SIEMENS B125 Miniature Circuit Breaker BL Series 25A 1 Pole 120/240V AC

SKU CH-A1A5-M9K3S

A bolt-on miniature circuit breaker rated 25A, single-pole, 120/240V AC with 10kA interrupting capacity for Siemens P1 panelboards

  • Reliable overload protection up to 10kA interrupting rating
  • Fits standard P1 panelboards with bolt-on mounting
  • Single-pole 25A breaker for 120/240V AC circuits
  • Accepts 14 AWG copper or 12 AWG aluminium conductors
  • Compact 1-inch frame saves space in load centres

Siemens BL Series 25 A Circuit Breaker

This Siemens BL Series miniature circuit breaker provides single-pole overcurrent protection rated at 25 A for 120/240 V AC systems. It features a bolt-on mounting style and toggle actuator designed for use with Siemens P1 panelboards and load centers. The unit carries a maximum AIR rating of 10 kA at the rated voltage.

Electrical panels needing single-pole 25

Installers fitting Siemens P1 series panelboards will find this breaker matches the required form factor and electrical rating. It is not suitable for applications requiring multi-pole switching, DC circuit protection, or plug-in mounting styles. Buyers needing higher interrupting ratings or different frame sizes should select alternative devices.

10 kA AIR rating at 120/240 V AC

The 10 kA interrupting capacity determines whether this breaker can safely clear fault currents in the intended installation. Verify that the available short-circuit current at the panelboard does not exceed this rating. The bolt-on terminal accepts copper wire down to 14 AWG and aluminium wire down to 12 AWG.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $37.99
Cheaper than about 65% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

Will the 25 A BL series breaker fit in my existing Siemens P1 panelboard?

The breaker is designed for Siemens P1 panelboards and uses a bolt-on mounting style that matches the panelboard bus.

How can I verify the breaker trips correctly after installation?

Turn on the load and confirm the toggle stays in the on position; if an overcurrent occurs the toggle will move to the tripped position.

Does the package include the lug terminals or must I buy them separately?

The breaker comes with integral lug terminals that accept 14 AWG copper or 12 AWG aluminum wire; no separate lugs are needed.

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