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Siemens B120 single-pole breaker, grey toggle, bolt-on mount

SIEMENS

SIEMENS B120 Miniature Circuit Breaker BL Series 20A 1 Pole 120/240V AC

SKU CH-0ANP-H5SHE

Single-pole bolt-on breaker rated 20 A at 120/240 V AC with 10 kA interrupting capacity for Siemens P1 panels

  • 20 A single-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • Bolt-on mounting fits Siemens P1 panelboards directly
  • Lug terminals accept 14 AWG copper or 12 AWG aluminium
  • Compact 3.6 in frame saves space in load centers

Siemens BL 20 A Single-Pole Breaker

This Siemens BL series miniature circuit breaker is a bolt-on device rated at 20 amps and 120/240 volts AC. It fits single-phase P1 panelboards and uses a standard toggle actuator. The unit carries a 10 kA interrupting rating at the rated voltage and accepts copper wire down to 14 AWG or aluminium down to 12 AWG.

Who This Suits And Who Should Look Elsewhere

Electricians wiring a 20-amp branch circuit in a compatible Siemens P1 load centre will find this breaker a direct fit. It is not suitable for panels that reject the BL frame, for circuits requiring two-pole or three-pole protection, or for any DC application since the device has no DC voltage rating.

The Specification That Decides Fit

The decisive specification is the bolt-on mounting style combined with the BL frame size of 125 A, which only matches Siemens P1 series panelboards. If the load centre uses a different mounting method or frame, this breaker cannot be installed.

How it compares

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

Price $39.99
Cheaper than about 63% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

What is the maximum AIR rating for this 20A single-pole breaker at 120/240V AC?

The breaker carries a 10kA interrupting rating at 120/240V AC, which caps the fault current it can safely clear in a Siemens P1 panelboard.

What panelboard series and mounting style does this bolt-on breaker require?

It is designed for Siemens P1 panelboards and uses a bolt-on mounting style that secures directly to the bus bar.

How is the lug terminal installed, and what wire sizes are approved?

Insert stripped copper wire of 14 AWG or aluminum wire of 12 AWG into the lug and torque to the panelboard manufacturer's specification.

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