An MCC bucket is a removable or fixed unit installed in a motor control center. It contains the switching, protection, and control equipment for a motor or feeder circuit. Matching the correct bucket requires more than the amp rating: the manufacturer, MCC series, physical construction, bus connection, voltage, control scheme, and available vertical space must all be verified.
If you are ready to source a unit, browse Ampstate’s MCC buckets for sale or send the existing nameplate and clear photos to sales@ampstate.com for technical matching.
What Is Inside an MCC Bucket?
The contents depend on whether the unit is a starter, feeder, VFD, soft starter, or specialty control bucket. Common components include:
- Circuit breaker, motor circuit protector, or fusible disconnect
- Contactor or motor starter
- Overload relay
- Control power transformer and fusing
- Terminal blocks and field wiring points
- HOA selector switches, pilot lights, pushbuttons, meters, or communications
- Stabs, shutters, interlocks, and operating-handle hardware specific to the MCC series
Common MCC Bucket Types
| Type | Typical application |
|---|---|
| FVNR starter | Starts and stops a motor in one direction at full voltage. |
| Reversing starter | Provides forward and reverse motor operation with electrical and mechanical interlocking. |
| Feeder or breaker bucket | Protects and supplies a downstream load or distribution circuit. |
| Fusible bucket | Uses a disconnect switch and fuses for isolation and short-circuit protection. |
| VFD bucket | Controls motor speed and torque with a variable-frequency drive. |
| Soft-starter bucket | Reduces starting current and mechanical stress during acceleration. |
How to Identify the Correct Replacement
- Manufacturer and MCC series: identify the structure, such as Eaton Freedom 2100, Allen-Bradley CENTERLINE 2100, Siemens Model 90, GE 8000, or Square D Model 6.
- Electrical system: confirm voltage, phase, frequency, available fault current, and grounding arrangement.
- Load requirements: provide motor horsepower and full-load current or the feeder amp rating.
- Bucket construction: measure the bucket height and confirm the stab, bus, door, handle, and mounting arrangement.
- Protection: record the breaker, fuse, overload, and starter catalog numbers and settings.
- Controls: specify control voltage, HOA functions, pilot devices, interlocks, PLC points, and communications.
- Condition and compliance: state whether the project requires new, reconditioned, retrofit, tested, or field-evaluated equipment.
Do not assume that two buckets with the same amp and voltage ratings are mechanically interchangeable. MCC bus and stab designs are manufacturer- and series-specific, and designs can change between vintages.
Popular MCC Bucket Series
- Eaton Freedom 2100 MCC buckets
- Allen-Bradley CENTERLINE 2100 MCC buckets
- Siemens MCC buckets, including legacy Model 90, System 89, and 8PU/8PX equipment
- Square D Model 6 MCC buckets
- GE 8000 Series MCC buckets
New, Reconditioned, or Retrofit?
A new OEM unit may be preferred for an active product line and a specification requiring manufacturer warranty. For legacy structures, a reconditioned original bucket or a custom retrofit may be the practical solution. The correct choice depends on the project specification, listing requirements, fault rating, component availability, downtime, and budget.
Information to Send With an RFQ
For a faster and more accurate quote, provide clear photos of the MCC nameplate, existing bucket, door, stabs, vertical bus connection, breaker or disconnect, starter and overload. Include the required amp rating or horsepower, voltage, phase, control voltage, bucket height, wiring diagram, one-line diagram, quantity, condition requirement, destination ZIP/postal code, and required delivery date.
Need an MCC Bucket Quote?
Ampstate supplies replacement, retrofit, and custom MCC buckets across Canada and the United States. We can assist with model matching, technical review, wiring, testing, wiring diagrams, and engineering drawings. Browse MCC buckets or email sales@ampstate.com with your specifications and photos.
