APC by Schneider Electric 0M-6866 3-Pole 50A Circuit Breaker 120/240V
Overview
The APC by Schneider Electric 0M-6866 is a tested, three-pole 50-amp circuit breaker rated for 120/240V AC service — a purpose-built overcurrent protection component for commercial and industrial power distribution panels. If you're running high-draw loads across a three-phase or split-phase panel in a data center, equipment room, or building electrical infrastructure, this breaker is sized for the load without overbuilding the hardware budget. Factory-tested before leaving the facility, the 0M-6866 (often searched as 0M 6866) arrives ready to install and commission without additional bench verification.
Key Features
- 50A Continuous Current Rating: Sized for high-draw branch circuits — appropriate for PDU feeds, HVAC compressor loads, or multi-rack equipment circuits where a 20A or 30A breaker would nuisance-trip under sustained draw. Running at 80% of rating per NEC code, this breaker handles up to 40A of continuous load.
- Three-Pole Configuration: Protects all three legs of a circuit simultaneously. In a split-phase 240V panel, tripping one pole trips all three — critical for motor loads and three-wire equipment where leaving a phase energized after a fault creates a hazard. Single-pole breakers cannot provide this protection.
- 120V/240V AC Dual Voltage Rating: Compatible with both standard North American 120V single-phase branch circuits and 240V split-phase loads. Versatile enough to serve a range of panel configurations without needing separate part numbers for different voltage tiers.
- UL Listed: Meets Underwriters Laboratories standards for overcurrent protective devices — required for code compliance on commercial electrical installations in the United States. UL listing means the breaker has been independently evaluated for interrupting capacity, temperature rise, and trip accuracy.
- Factory-Tested: The product title designates this as a tested unit, meaning trip characteristics and mechanical operation have been verified under load conditions prior to shipment. This matters for replacement scenarios where an untested breaker creates uncertainty in a live panel.
- Compact Physical Footprint: At 12.50 × 8.50 × 4.50 inches and 2.1 lbs, this breaker ships in a manageable package. Verify your panel's breaker slot dimensions and bus compatibility before ordering — three-pole breakers consume three adjacent slots in a standard panel.
Integration and Compatibility
The 0M-6866 is an APC by Schneider Electric component intended for use with compatible Schneider Electric and APC panel boards and power distribution systems. Three-pole 50A breakers are common replacements in equipment rooms and server closets where APC PDUs or UPS systems feed downstream branch circuits. Before installation, cross-reference the breaker's frame size and bus stab configuration against your panel manufacturer's compatibility guide — breaker interchangeability between brands is not guaranteed even when ampere ratings match. Consult your panel's documentation or a licensed electrician to confirm bus bar compatibility and slot availability. This unit ships as a single breaker (packaged quantity of one).
Frequently Asked Questions
Q: What voltage is the APC 0M-6866 rated for?
A: The 0M-6866 is rated for 120V AC and 240V AC service, making it compatible with standard North American single-phase and split-phase panel configurations.
Q: Is the 0M-6866 UL listed?
A: Yes. The 0M-6866 complies with UL standards for circuit breakers, meeting requirements for commercial electrical installations in the United States.
Q: How many poles does the 0M-6866 have?
A: It is a three-pole breaker. This means it protects three conductors simultaneously and occupies three adjacent slots in a compatible panel.
Q: What is the continuous current rating for the 0M-6866?
A: The 0M-6866 is rated at 50 amps. Per NEC guidelines for continuous loads, plan the circuit for no more than 40A of sustained draw (80% of rated capacity).
Q: How many units are included per order?
A: Each order includes one (1) circuit breaker unit.
Q: What are the physical dimensions and weight of the 0M-6866?
A: The 0M-6866 measures 12.50 × 8.50 × 4.50 inches and weighs 2.1 lbs as packaged.
When I spec replacement breakers for equipment rooms, the combination that matters most is pole count, ampere rating, and voltage range — and the APC 0M-6866 checks all three for high-draw commercial branch circuits. The 50A three-pole configuration with 120/240V AC dual-voltage rating is the right profile for circuits feeding large UPS systems, motor loads, or multi-rack PDU feeds where a two-pole or lower-amp breaker simply won't carry the sustained current without false trips.
Technical Highlights:
- 50A Three-Pole Rating: Handles up to 40A continuous under NEC 80% rule — appropriate for branch circuits serving APC PDUs or similarly sized equipment without nuisance tripping under sustained draw.
- 120V/240V Dual Voltage: One part number covers both common North American panel voltages, reducing SKU proliferation when you're managing a mixed panel environment across a facility.
- UL Listed: Code-required for commercial installations in the US — trip accuracy, interrupting capacity, and thermal performance have all been independently verified, not just self-certified.
Deployment Considerations:
- Three-pole breakers consume three adjacent slots in a panel — verify available contiguous slots and bus bar stab compatibility with your specific panel model before ordering. Frame size mismatches between brands are a common and costly mistake on first replacement orders.
- The 2.1 lb packaged weight and 12.50 × 8.50 × 4.50-inch package dimensions are the shipping spec, not the installed breaker dimensions — measure your panel's breaker bay before assuming fit based on package size alone.
The 0M-6866 is a solid fit for equipment rooms where an APC or Schneider Electric panel board is already in place and you need a verified, UL-listed 50A three-pole replacement without sourcing from outside the established panel ecosystem.
