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Siemens BL series 50A three-pole miniature circuit breaker, bolt-on toggle design

SIEMENS

SIEMENS B350 Miniature Circuit Breaker BL Series 50A 3 Pole 240V AC 10kA

SKU CH-EPM0-26WHV

Three-pole miniature circuit breaker rated 50 A at 240 V AC with a 10 kA interrupting capacity for Siemens P1 panelboards

  • 50 A rating protects three-phase circuits up to 240 V AC
  • 10 kA interrupting capacity clears heavy fault currents safely
  • Bolt-on mounting fits directly into Siemens P1 panelboards
  • 125 A frame accepts 8 AWG to 4 AWG aluminium or 6 AWG copper lugs
  • Standard toggle actuator gives clear on/off indication

Three-Pole Protection for 240 V AC Panels

This Siemens BL-series miniature circuit breaker delivers 50 A three-phase protection at 240 V AC with a 10 kA interrupting rating. It is designed for commercial and residential load centres that require bolt-on mounting in a compatible P1 panelboard. The 125 A frame size fits standard BL bus arrangements.

Thermal-Magnetic Trip with Bolt-On Security

The thermal-magnetic mechanism responds to sustained overloads and short-circuit faults without external power. Bolt-on mounting secures the breaker to the panel bus, reducing resistance and vibration compared with plug-in alternatives. Toggle actuation gives a clear visual indication of tripped status.

Lug Terminals for 8 AWG to 6 AWG Copper

Integrated lug terminals accept conductors from 8 AWG up to 6 AWG copper or 4 AWG aluminium, simplifying field wiring. The breaker occupies three pole spaces in a Siemens P1 panelboard and requires no additional accessories for standard installation. It is not rated for DC applications.

How it compares

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Price $279.99
Pricier than about 86% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

How do I install the B350 breaker in a Siemens P1 panelboard, and what torque setting is required for the lug terminals?

Bolt the breaker onto the P1 panelboard bus using the bolt-on mounting style, then insert 8 AWG to 6 AWG copper or 8 AWG to 4 AWG aluminium conductors into the lug terminals and torque to the value printed on the breaker label.

What maintenance or replacement will the B350 breaker need after it trips on a fault?

After a fault trip inspect the toggle actuator and lug terminals for discolouration or damage; if the contacts are eroded or the mechanism feels loose, replace the entire breaker because the BL series frame is not field-serviceable.

What is the first limit the B350 breaker reaches under sustained overload before it trips?

The thermal element reacts first, opening the 50 A poles when current exceeds the rated value for the time defined by the B-curve, well before the 10 kA magnetic interrupting limit is tested.

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