The MV distribution panel is the central nervous system of any industrial electrical installation.
Panel Types
Metal-Clad (Withdrawable)
Withdrawable breaker trucks for live maintenance. IEC 62271-200 / IEEE C37.20.2. Best for critical installations. See metal-clad vs metal-enclosed comparison.
Metal-Enclosed (Fixed)
Fixed breakers, lower cost. NAIJI panels 12-40.5kV. For industrial distribution.
Ring Main Units
Compact sealed units for cable loop networks.
Main Components
| Component | Function | Key Spec |
|---|---|---|
| Circuit breaker | Interrupt load/fault | V, A, kA |
| Bus bars | Current between cubicles | 630-4,000A |
| CTs | Current metering/protection | Ratio, class |
| PTs | Voltage metering/protection | Ratio, class |
| Protection relay | Monitor and trip | ANSI functions |
| Earthing switch | Ground for maintenance | Making capacity |
Typical Configuration
- Incoming: Main VCB, metering, overcurrent/earth fault relay
- Bus-tie: Connects bus sections for redundancy
- Outgoing feeders: Individual VCB + CTs + relay per feeder
- Capacitor bank: VCB or vacuum contactor for PFC
- PT/metering: Bus voltage reference
Specification Checklist
- Voltage: ___kV
- Bus current: ___A
- Fault: ___kA for ___seconds
- Panels: incoming / bus-tie / feeders
- Breaker: fixed / withdrawable
- Protection: ANSI functions per cubicle
- CT/PT ratios
- Control: ___V AC/DC
- Standards: IEC 62271-200 / IEEE C37.20.2
NAIJI delivers 12-40.5kV assemblies up to 4,000A / 50kA, factory-tested. 30-60 day lead time.
Request MV panel quotation — send single-line diagram for proposal within 5 days.