SIEMENS
SIEMENS B35000S01 Miniature Circuit Breaker 50A 3 Pole 120/240V
Three-pole 50 A miniature breaker with shunt-trip function bolts into Siemens P1 panelboards at 120/240 V AC with a 10 kA interrupting rating
- 50 A rating protects circuits up to 10 kA at 240 V
- Three-pole design handles 120/240 V three-phase loads
- Shunt-trip actuator allows remote emergency shutdown
- Bolt-on mounting fits Siemens P1 panelboards directly
- 125 A frame in 3.7 × 4.4 × 5.4 in enclosure
Siemens BL-Series 50 A Three-Pole Breaker
This Siemens BL-series miniature circuit breaker provides 50 A overcurrent protection for three-phase 120/240 V AC systems. It features a 10 kA interrupting rating at 240 V AC and a bolt-on mounting style with lug terminals. The frame size is rated at 125 A.
For Siemens P1 Panelboard Installations
The breaker suits electricians and maintenance teams fitting or replacing shunt-trip protection in Siemens P1 panelboards where three-pole 50 A coverage is specified. It does not suit DC circuits, panels outside the P1 series, or applications requiring a higher interrupting capacity than 10 kA.
10 kA AIR at 240 V AC
The 10 kA maximum AIR rating at 240 V AC is the key specification that determines whether this breaker meets the fault-current requirements of the installation. Confirm the available short-circuit current before selecting this device.
Highlights
- 50 A rating protects circuits up to 10 kA at 240 V
- Three-pole design handles 120/240 V three-phase loads
- Shunt-trip actuator allows remote emergency shutdown
- Bolt-on mounting fits Siemens P1 panelboards directly
- 125 A frame in 3.7 × 4.4 × 5.4 in enclosure
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Does the 50 A breaker generate noticeable heat or noise when carrying full load all day?
The toggle-actuator breaker runs silently; heat rise stays within the 10 kA AIR rating at 240 V AC, so normal panel ventilation is sufficient.
What panelboard and wiring must already be in place for this bolt-on unit to install?
It requires a Siemens P1 panelboard, a 3-pole 120/240 V AC three-phase bus, and copper conductors no smaller than 8 AWG for the lug terminals.
Will the 3.7 in × 4.4 in frame fit beside older BL-series breakers in the same load center?
Yes — the 125 A frame size matches legacy BL breakers, so it mounts on the same bolt-on bus without adapter kits.
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