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Siemens BL series 50A two-pole miniature circuit breaker with toggle actuator, bolt-on mounting, grey plastic housing

SIEMENS

SIEMENS B250 Miniature Circuit Breaker BL Series 50A 2 Pole 120/240V AC

SKU CH-NPFN-D4YMQ

Protects 120/240V AC circuits with a 50 A, 2-pole bolt-on breaker rated for 10 kA interrupting capacity

  • 50 A rating handles heavy residential circuits
  • 10 kA interrupting capacity clears faults safely
  • Bolt-on design fits Siemens P1 panelboards
  • Two-pole construction serves 120/240 V AC systems
  • 125 A frame size matches standard BL series dimensions

BL Series 50 A bolt-on breaker

This Siemens BL Series miniature circuit breaker provides 50 A over-current protection for single-phase 120/240 V AC branch circuits. It mounts by bolting directly onto compatible Siemens P1 panelboards and load centers. The two-pole design occupies two adjacent spaces in the panel. It is suited for residential and light-commercial electrical installations requiring standard thermal-magnetic trip characteristics.

Panel integration and wire range

The breaker uses a bolt-on mounting style that secures to the P1 series bus without a separate clip kit. Terminal lugs accept conductors down to 8 AWG, simplifying connections for typical branch-circuit wire sizes. A 10 kA interrupting rating at 120/240 V AC handles available fault current in most service-entrance applications. The 125 A frame size ensures compatibility with the panel’s bus rating.

Toggle actuator and shipping condition

A front-mounted toggle actuator gives clear on/off/trip indication for quick status checks during commissioning or troubleshooting. The unit ships new in manufacturer packaging, ready for immediate installation. No additional accessories or configuration software are included or required for basic operation.

How it compares

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

Price $88.99
Pricier than about 65% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

Will the 50 A breaker trip if it runs at full load all day?

The breaker is rated for continuous operation at 50 A on a 125 A frame; sustained loads at this level are within its design limits.

How much heat or noise does the bolt-on toggle produce during constant use?

A miniature breaker of this type runs silently; warmth at the lugs is normal but stays within the 10 kA interrupting rating at 120/240 V AC.

Which panelboard must I already have for this BL-series breaker to fit?

It is built for Siemens P1 panelboards and requires a bolt-on mounting rail with lug terminals accepting a minimum of 8 AWG wire.

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