If you have ever opened two panel quotations side by side and wondered why one says PCC and the other says MCC — and whether it actually matters for your plant — this guide is for you. Both are floor-mounted LV distribution boards, both carry busbars, both can look almost identical from the front. But they sit at different points in your power distribution and they are built to different priorities. Getting this right at the enquiry stage saves money, panel-room space, and a lot of retrofit pain later.
PCC (Power Control Centre) receives and distributes incoming power to large feeders. MCC (Motor Control Centre) takes power and controls many individual motors. A PCC distributes; an MCC controls.
What is a PCC (Power Control Centre)?
A PCC is the panel that sits right after your incoming supply — typically downstream of the transformer or the main LT incomer. Its job is to receive a large block of power and split it into outgoing feeders: feeders to sub-distribution boards, to MCCs, to large standalone loads, and to capacitor (APFC) panels.
Because it handles the full incoming current, a PCC is built around high-rated ACBs and MCCBs, heavy busbars (often 1000A–4000A+), and high short-circuit withstand. It is a power-handling panel first. Control and automation, if present, are minimal.
- Incomer protection via ACB (Air Circuit Breaker), often with bus-coupler in 2-incomer schemes
- Outgoing feeders via MCCBs to downstream panels
- Heavy busbar system rated for full incomer current
- Metering, energy monitoring, and protection relays at the incomer
What is an MCC (Motor Control Centre)?
An MCC takes power (very often from a PCC) and uses it to start, stop, protect and control many motors — pumps, fans, conveyors, compressors, agitators. Where a PCC thinks in terms of feeders, an MCC thinks in terms of motor starters.
Each motor gets its own feeder module: a starter built from an MPCB (or MCCB + overload), a contactor, and control wiring — DOL, Star-Delta, or VFD/soft-starter depending on the motor. MCCs are typically built in a compartmentalised, modular form so each starter sits in its own withdrawable or fixed compartment for safe maintenance without shutting the whole panel.
- One feeder module per motor — DOL / Star-Delta / VFD / soft starter
- MPCB + contactor combination per starter (Siemens 3RV2 + 3RT2 is typical)
- Compartmentalised / modular construction (fixed or draw-out)
- Control logic — PLC, relay interlocks, local/remote, field signals
PCC vs MCC: Side-by-Side
| Parameter | PCC (Power Control Centre) | MCC (Motor Control Centre) |
|---|---|---|
| Primary job | Distribute incoming power to feeders | Control & protect individual motors |
| Position in system | Upstream — right after transformer / incomer | Downstream — fed from the PCC |
| Key devices | ACBs, large MCCBs, heavy busbars | MPCBs, contactors, overloads, VFDs, PLC |
| Current rating | High (1000A–4000A+ bus) | Moderate per feeder; sum of motor loads |
| Construction | Fixed, robust, power-focused | Compartmentalised / modular, draw-out option |
| Control / automation | Minimal — metering & protection | Extensive — interlocks, PLC, field I/O |
| Feeder count | Few, large | Many, smaller |
| Maintenance | Feeder-level, usually needs isolation | Module-level, hot-maintenance in draw-out type |
| Governing standard | IS 8623 / IEC 61439-1, -2 | IS 8623 / IEC 61439-1, -2 |
Ratings indicative. Final selection depends on load study, fault level, and site conditions.
How They Work Together in a Real Plant
In most steel, cement, and process plants across eastern India, you do not choose one or the other — you have both, in sequence:
↓
PCC — receives full power, distributes to feeders
↓ ↓ ↓
MCC-1 MCC-2 APFC Panel Sub-DBs
↓
Motors (pumps · fans · conveyors · compressors)
The PCC is the "main switchboard" that splits power; the MCCs are where that power is turned into controlled motor operation. A small workshop with a handful of motors might combine both functions into a single panel — but as soon as you have many motors or need clean fault isolation, separating PCC and MCC is the right engineering call.
How to Decide What You Need
Count your motor loads
If your scope is dominated by motors that need individual start/stop, protection, and control — you need an MCC. Many motor feeders = MCC, no question.
Check where the panel sits
If it is the first board after the transformer feeding several downstream panels, it is a PCC. If it is fed by another panel and drives motors, it is an MCC.
Match the fault level
A PCC near the transformer sees higher fault current and needs higher Icw/Icu busbars and breakers. Under-rating the PCC is a safety and compliance failure.
Plan for maintenance & growth
If you cannot afford to shut the plant to service one motor, specify a draw-out (withdrawable) MCC. If you expect to add motors, leave spare modules.
For most MSME and mid-size industrial clients in Jharkhand, Bihar and Odisha, we build PCCs around Siemens ACBs/MCCBs and MCCs around Siemens 3RV2 MPCBs + 3RT2 contactors, with full FAT before dispatch and SAT support on site. As-built drawings and test certificates are part of the standard handover — essential for tender and discom compliance.
Common Mistakes When Specifying
Asking for an "MCC" when you mean main distribution
Loosely calling every floor-mounted panel an MCC leads to wrong quotes. If it distributes power to feeders, say PCC.
Ignoring fault level on the PCC
A PCC bus rated below the available short-circuit current is dangerous. Always provide the transformer rating and impedance.
No spare feeders / modules
Plants grow. A panel with zero spare capacity forces a full replacement instead of adding a module. Budget 15–20% spare.
Choosing fixed type to save cost on critical lines
For continuous-process motors, the savings on a fixed MCC are wiped out by the first unplanned shutdown to service one feeder.
Not sure whether you need a PCC, an MCC, or both?
Send us your load list or single-line diagram. As an authorized Siemens channel partner, Aventra Systems will size the right panel configuration for your plant — across Jharkhand, Bihar & Odisha.
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