SIEMENS
SIEMENS B350 Miniature Circuit Breaker BL Series 50A 3 Pole 240V AC 10kA
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.
Highlights
- 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
Specifications
| Brand | SIEMENS |
|---|
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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