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Siemens BL 50 A single-pole bolt-on breaker, grey toggle, compact rectangular body

SIEMENS

SIEMENS BL 50 A 1-pole 120/240 V AC bolt-on circuit breaker

SKU CH-5PZ1-2JZ8X

Single-pole 50 A bolt-on breaker rated 120/240 V AC with 10 kA interrupting capacity for Siemens P1 panels

  • Product typeCircuit Breakers
  • 50 A single-pole protection for residential circuits
  • 10 kA interrupting rating handles fault currents safely
  • Bolt-on mounting fits Siemens P1 panelboards directly
  • 120/240 V AC rating covers standard household voltages
  • 8 AWG minimum wire size supports robust conductor connections

Siemens BL 50 A Single-Pole Breaker

This Siemens BL series circuit breaker is a single-pole, bolt-on device rated at 50 amps for 120/240 V AC systems. It fits Siemens P1 panelboards and load centres, providing standard overcurrent protection with a 10 kA interrupting rating at the rated voltage. The toggle actuator allows manual switching, and the lug terminals accept wire sizes down to 8 AWG. It is built on a 125 A frame in a compact 3.6 in length.

Suited For Siemens P1 Panels

Electricians and facility managers maintaining or expanding Siemens P1 load centres will find this breaker a direct fit for single-phase branch circuits requiring 50 A protection. It is not suitable for panels of other brands or series, for three-phase applications, or for circuits needing DC voltage ratings. Installers requiring a two-pole or higher interrupting capacity device should look elsewhere.

50 A Rating Decides Fit

The 50 A current rating is the primary specification that determines whether this breaker matches the circuit design. The conductor ampacity and the load calculation must align with this value for code-compliant protection. The 10 kA AIR rating at 120/240 V AC must also meet the available fault current at the installation point. Verify both figures against the project requirements before purchase.

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Price $42.99
Cheaper than about 61% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSiemens
Product typeCircuit Breakers

Questions about this item

How do I bolt the BL 50 A breaker into a Siemens P1 panelboard, and what torque should I use on the lug?

Align the bolt-on base with the P1 panelboard bus, secure the mounting screw, then insert 8 AWG minimum copper wire into the lug and tighten to the torque value printed on the breaker label.

What part will need replacement after the BL 50 A breaker trips repeatedly?

The breaker itself is the replaceable component; after repeated over-current trips the internal mechanism can degrade, so replace the entire BL series unit rather than attempting internal repair.

At what fault current does the BL 50 A breaker reach its interrupting limit?

The maximum AIR rating is 10 kA at 120/240 V AC; any available fault current above that level exceeds the breaker’s tested interrupting capacity.

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