Current-production and recently available MCC parts for facilities maintaining or expanding active MCC lineups. Starter buckets, feeder tap units, bus assemblies, and structural hardware for Square D Model 6, Eaton Freedom 2100, Siemens TIASTAR, and Allen-Bradley 2100 MCC systems.
When a facility needs to add a motor to an existing MCC lineup, replace a failed starter unit, or expand an existing section, the parts must match the MCC system already in place. This page covers current-production parts for the four most common active MCC systems in U.S. industrial facilities.
MCC parts are highly system-specific. A starter bucket for a Square D Model 6 does not interchange with a Siemens TIASTAR unit. Section width, stab configuration, unit height in spaces, and door assembly dimensions all vary by manufacturer and series. When submitting a quote request, include the MCC manufacturer and series name along with the unit details listed at the bottom of this page.
For legacy MCC parts from discontinued lineups, see our legacy MCC parts page.
The same NEMA Size 2 starter looks like the same part across manufacturers, but the bucket assembly that carries it is different for every MCC system. Section width (typically 20 inches on current systems), unit height in spaces, stab assembly configuration, and door interlock hardware vary by manufacturer and series revision.
Send us the MCC series name, section width, unit height, unit type, starter size, and motor details. The more specific you are, the faster we can confirm the correct catalog number and quote it accurately.
Each unit type serves a different function within the MCC section. Motor ratings listed are at 480V, 3-phase. Ratings change at other supply voltages.
Full voltage non-reversing starter units are the most common MCC unit type. They contain a contactor, overload relay, and either a disconnect (combination unit) or no disconnect (non-combination unit). NEMA size determines the motor rating the unit can handle.
At 480V, 3-phase: NEMA 00 handles up to 1.5HP, NEMA 0 up to 3HP, NEMA 1 up to 10HP, NEMA 2 up to 25HP, NEMA 3 up to 50HP, NEMA 4 up to 100HP, NEMA 5 up to 200HP. Larger units (NEMA 6, 7) are available for larger motors.
Full voltage reversing units contain two contactors (forward and reverse) with mechanical and electrical interlocking to prevent simultaneous energization. Used for applications that require the motor to run in both directions: conveyors, dampers, doors, and similar loads.
FVR units consume more section space than FVNR units of the same starter size because of the second contactor. Confirm unit height in spaces when submitting a quote so we can verify the combination starter catalog number.
Combination starter units include a short-circuit protective device integrated with the starter. The protection device is either a molded case circuit breaker (CB type) or a fusible disconnect switch (fusible type). The choice affects short-circuit interrupting rating, coordination with upstream devices, and the overload/short-circuit protection boundary.
Specify CB type or fusible type, interrupting rating if required by your system coordination study, and NEMA starter size. For fusible types, specify fuse class and size if known, or provide motor HP and FLA so we can confirm the recommended fuse rating.
Feeder tap units provide outgoing circuit protection for non-motor loads, sub-panels, or downstream distribution equipment fed from the MCC. They do not contain a contactor or overload relay. Protection is via a circuit breaker or fusible disconnect sized for the feeder cable and load.
Common for lighting panel feeds, smaller distribution panels, and process loads that are not motor-controlled. Specify feeder ampere rating, voltage, protection type (breaker or fuse), and whether you need a main lug or lugs only.
Main breaker units contain the overcurrent protection for the entire MCC section or lineup and mount at the top of the incoming section. Main lug units provide termination for incoming conductors without integral overcurrent protection (protection is assumed to be upstream).
Rating depends on the MCC lineup bus ampere rating. Common main breaker ratings: 400A, 600A, 800A, 1200A, 1600A. Specify MCC series, bus ampere rating, and the specific incoming section footprint if adding to an existing lineup.
Bus and structural components are needed when adding sections to an existing lineup or repairing damaged sections. These parts are as system-specific as the unit types above.
Copper or aluminum vertical bus bar assemblies for standard section widths. Rating depends on the MCC section ampere rating (typically 300A, 600A, or 1200A vertical bus). Specify manufacturer, series, section width, and vertical bus rating.
Main bus connects sections in a multi-section lineup. Bus rating must match the lineup design (400A, 600A, 800A, 1200A, 1600A, 2000A are common). Bus splice hardware connects adjacent sections. Specify MCC series and bus ampere rating.
Stab assemblies are the plug-in contact sets that allow units to connect to the vertical bus when inserted. They wear over time or can be damaged during unit removal. Specify MCC manufacturer, series, and the starter size or unit type the stab will serve.
Individual unit doors and full section door assemblies. Doors are specific to section width and unit height. Handle-interlock hardware varies by unit type. Specify MCC series, section width, and unit height in spaces when ordering replacement doors.
Back pans provide the mounting surface for unit hardware inside the section. They are typically painted steel and are unit-height-specific. Required when adding a unit to an empty section or replacing a damaged pan.
Phase barriers, bus insulation boots, and unit mounting brackets. These are the small parts most often needed during a section repair or unit replacement. Specify MCC manufacturer and series; part descriptions or photos help confirm the right hardware.
MCC parts are system-specific. Providing complete information up front avoids back-and-forth and gets you an accurate quote faster. The table below shows the data fields that matter most.
| Field | What to Provide |
|---|---|
| MCC Manufacturer | Square D, Eaton, Siemens, or Allen-Bradley |
| MCC Series Name | Model 6, Freedom 2100, TIASTAR, or 2100 (not just manufacturer alone) |
| Section Width | Typically 20 inches on current systems; some older lineups are 19 inches |
| Unit Height | Space consumed in the section: 6", 12", 18", 24" are common increments |
| Unit Type | FVNR, FVR, combination CB, combination fusible, feeder tap, main breaker |
| NEMA Starter Size | 00, 0, 1, 2, 3, 4, 5 (for starter units) |
| Motor HP & FLA | Nameplate HP and full-load amps; needed to confirm overload relay range |
| Supply Voltage | 480V or 240V; confirm 3-phase or single-phase |
| Control Voltage | 120V AC or 24V DC for coil and control circuit |
| Quantity | Number of units needed |
Send your MCC details using the RFQ form or directly by email. Photos of the existing nameplate or unit are welcome, especially for structural and hardware components.
Submit via RFQ Form