SIEMENS
SIEMENS B140 Miniature Circuit Breaker BL Series 40A 1 Pole 120/240V AC
A 40-amp single-pole breaker rated for 120/240V AC with a 10kA interrupting rating and bolt-on mounting for Siemens P1 panelboards
- 40 A rated current protects single-phase circuits up to 40 A
- 10 kA interrupting capacity clears faults safely at 120/240 V AC
- Bolt-on mounting fits Siemens P1 panelboards directly
- Toggle actuator gives clear on/off indication
- Accepts 8–6 AWG wire for flexible installation
SIEMENS BL 40A Single-Pole Breaker
This SIEMENS B140 miniature circuit breaker is a bolt-on, single-pole device rated at 40A and 120/240V AC. It belongs to the BL series with a 125A frame size and fits Siemens P1 panelboards. The toggle actuator provides standard manual switching for branch-circuit protection.
Who this suits and who should look elsewhere
Electricians and facility managers protecting a 40A single-phase branch circuit in a compatible P1 load center will find the correct ratings and mounting style here. Installations requiring a two-pole breaker, a different amperage, a plug-on mounting method, or a panelboard series other than P1 are not addressed by this device.
The deciding specification: 10kA AIR at 120/240V AC
The maximum interrupting rating of 10kA at 120/240V AC determines whether this breaker can safely clear a fault on your system. Verify that the available fault current at the point of installation does not exceed this value before selecting the B140.
Highlights
- 40 A rated current protects single-phase circuits up to 40 A
- 10 kA interrupting capacity clears faults safely at 120/240 V AC
- Bolt-on mounting fits Siemens P1 panelboards directly
- Toggle actuator gives clear on/off indication
- Accepts 8–6 AWG wire for flexible installation
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Will the bolt-on mounting fit a Siemens P1 panelboard?
Yes, the breaker is designed for bolt-on installation in Siemens P1 panelboards and load centers.
What wire sizes can the lug terminals accept?
The lug terminals accept copper conductors from 8 AWG minimum to 6 AWG maximum.
What interrupting rating does the breaker provide?
The breaker delivers a maximum AIR rating of 10kA at 120/240V AC.
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