Circuit Breakers

Lumera Electric stocks circuit breakers from Square D, Eaton / Cutler-Hammer, Siemens, and GE — in 15A to 200A, single-, two-, and three-pole, in both plug-on and bolt-on mounting. Standard thermal-magnetic, GFCI, AFCI, and dual-function breakers ship with trade pricing and bulk-quote support.

Circuit Breakers

What circuit breaker brands does Lumera Electric carry?

Lumera stocks Square D (QO and Homeline), Eaton / Cutler-Hammer (BR and CH), Siemens (QP), and GE (THQL and Q-Line). Each line is matched to its own panel bus, and UL-classified interchangeable breakers are available where a listed cross-fit exists.

  • Square D QO — fits Square D QO load centers
  • Square D Homeline — fits Square D Homeline load centers
  • Eaton / Cutler-Hammer BR — fits Eaton BR load centers
  • Eaton / Cutler-Hammer CH — fits Eaton CH load centers
  • Siemens QP — fits Siemens and Murray (legacy) panels
  • GE THQL / Q-Line — fits GE and ABB load centers

How do I choose the right amperage and pole configuration?

Match breaker amperage to the conductor and the load. Per the NEC, use 15A with 14 AWG, 20A with 12 AWG, and 30A with 10 AWG. A single-pole breaker feeds 120V circuits, a two-pole feeds 240V, and a three-pole feeds three-phase loads.

  • 15A — 14 AWG — 1-pole — 120V lighting & receptacles
  • 20A — 12 AWG — 1-pole — 120V kitchen & small-appliance
  • 30A — 10 AWG — 2-pole — dryer, water heater
  • 40A — 8 AWG — 2-pole — electric range, EV charger
  • 50A — 6 AWG — 2-pole — range, EV charger
  • 60A — 6 AWG (75°C) — 2-pole — subpanel feeder

Conductor sizing per NEC 240.4(D) and 310.16; verify for your insulation temperature rating and terminations.

What is the difference between plug-on and bolt-on breakers?

Plug-on breakers clip onto the panel bus for fast installation in residential load centers. Bolt-on breakers fasten with screws for vibration resistance in commercial panelboards. The mounting style must match the panel — the two are not interchangeable.

When do I need a GFCI or AFCI breaker?

GFCI breakers protect against ground faults in wet areas such as bathrooms, kitchens, and outdoors. AFCI breakers protect against arc faults in living-area branch circuits. Dual-function breakers provide both, which the NEC requires in many residential locations.

What is the interrupting rating (AIC), and why does it matter?

AIC is the highest fault current a breaker can safely interrupt, commonly 10kA, 22kA, or 65kA. The breaker's AIC must meet or exceed the available fault current at its point of installation, or it can fail during a short circuit.

Pair a new panel with Surge Protective Devices (Type 1 & 2), or browse all Power Supplies, Drivers & Circuit Breakers.