SIEMENS
SIEMENS B330 Circuit Breaker 30A 3 Pole 240V AC 10kA
Three-pole bolt-on breaker rated 30 A at 240 V AC with 10 kA interrupting capacity for Siemens panelboards
- Reliable overload protection with 30 A rating
- Three-pole design switches all phases simultaneously
- 240 V AC rating suits standard panels
- 10 kA interrupting capacity clears faults safely
- CSA, UL and NOM certifications confirm compliance
SIEMENS B330 30A Three-Pole Breaker
The SIEMENS B330 is a bolt-on circuit breaker rated at 30 amps with three poles for 240 V AC systems. It is designed for use in compatible Siemens panelboards where standard branch-circuit protection is required. The unit carries a 10 kA interrupting rating and meets UL, CSA and NOM certifications. It suits electricians and maintenance crews fitting or replacing branch breakers in commercial or residential panels.
Capacity and headroom: 30 A continuous
The breaker handles continuous loads up to its 30 A rating and will interrupt short-circuit currents up to 10 kA at 240 V AC. It accepts copper conductors from 14 AWG to 6 AWG and aluminium from 12 AWG to 6 AWG, giving flexibility for typical branch wiring. The 125 A frame size provides physical space for the lugs but does not raise the device’s ampere rating. Applications requiring higher continuous current or a greater interrupting rating will need a different breaker.
240 V AC only — no DC rating
This device is rated solely for 240 V AC and carries no DC voltage rating, so it cannot be used in DC circuits such as solar arrays or battery banks. The three-pole construction occupies three panel spaces and uses a bolt-on mounting style specific to Siemens B-series panelboards. Verify panelboard compatibility and voltage requirements before purchase.
Highlights
- Reliable overload protection with 30 A rating
- Three-pole design switches all phases simultaneously
- 240 V AC rating suits standard panels
- 10 kA interrupting capacity clears faults safely
- CSA, UL and NOM certifications confirm compliance
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Will the 30 A B-series breaker fit in my existing Siemens 125 A frame panelboard?
Yes, the breaker is built for Siemens B-series panelboards with a 125 A frame size, so it installs directly into that equipment.
How can I confirm the 3-pole breaker is operating correctly once installed?
With the panel energised, measure 240 V AC across each pole using a multimeter and verify the breaker holds rated current without tripping.
Does the package include the lug terminals and mounting hardware, or must I buy them separately?
The breaker ships with integral lug terminals that accept 14–6 AWG copper or 12–6 AWG aluminium wire; no additional lugs or mounting hardware are required.
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