SIEMENS
SIEMENS BQ3B025 Miniature Circuit Breaker 25A 3 Pole 240V AC
Three-pole miniature circuit breaker rated 25 A at 240 V AC with a 10 kA interrupting capacity for Siemens panelboards
- 25 A three-pole protection for 240 V AC circuits
- 10 kA interrupting rating at 240 V AC
- Bolt-on mounting fits Siemens panelboards directly
- Terminal lugs accept 14–6 AWG copper or 12–6 AWG aluminium
- Rated for operation up to 104 °F
Three-pole protection for Siemens panels
This Siemens BQ3B025 miniature circuit breaker provides three-pole overcurrent protection at 25 A and 240 V AC. It is built for bolt-on installation in compatible Siemens panelboards using the BQ series frame. The 10 kA interrupting rating at 240 V AC handles typical residential and light commercial fault currents. A toggle actuator gives clear on-off indication for maintenance staff.
Suited for 25 A three-phase loads on BQ frames
Electricians wiring three-phase circuits rated at 25 A in a Siemens BQ panelboard will find this breaker matches the frame size and mounting style. It accepts copper wire from 14 AWG to 6 AWG and aluminium from 12 AWG to 6 AWG. Installers needing a different ampere rating, a different number of poles, or a DIN-rail mount should select another model. The unit is not rated for DC applications.
25 A rating on a 125 A BQ frame
The decisive specification is the 25 A trip rating within the 125 A BQ frame size. This combination determines whether the breaker fits the panelboard slot and protects the intended conductor size. Verify the panelboard schedule calls for a 25 A three-pole BQ breaker before ordering.
Highlights
- 25 A three-pole protection for 240 V AC circuits
- 10 kA interrupting rating at 240 V AC
- Bolt-on mounting fits Siemens panelboards directly
- Terminal lugs accept 14–6 AWG copper or 12–6 AWG aluminium
- Rated for operation up to 104 °F
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Will the bolt-on terminals need periodic re-torquing after installation?
The lug terminals accept copper wire from 14 AWG up to 6 AWG and aluminium from 12 AWG up to 6 AWG; a correct initial torque to Siemens specifications is the only required tightening.
What stops the breaker from carrying more than 25 amps continuously?
The thermal-magnetic trip unit is calibrated to open at 25 A; sustained overloads above that rating will cause the mechanism to trip.
How hot does the 3-pole unit get inside a panel running all day at full load?
The device is rated for a maximum operating temperature of 104 degrees Fahrenheit, so the enclosure must provide enough ventilation to keep ambient temperature at or below that level.
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