Low Voltage Switchboards
IEC 61439 assemblies from the transformer terminals to the motor: main switchboards, motor control centres, ATS and AMF panels, power-factor correction and drive cabinets.
Product family
10 product families
Main LV Switchboard
Representative ABB illustrationABB-authorised MDmax ST and MDrail-E ranges, with UL certificates
Main LV switchboard, withdrawable (MNS technology)
Main LV switchboard, withdrawable
Main LV switchboard, fixed
Low-voltage copper busbar bridge
MCC
Variable-frequency drive panels
Motor control centre, fixed and withdrawable
Motor control centre (MCC), withdrawable
ATS / AMF Panel
PFC Panel
Selection guide
Which board is used where?
Selection depends on where the supply comes from, the current to be carried, the site conditions and whether the installation can be interrupted for maintenance. Final values follow the single-line diagram, selectivity study and short-circuit calculation.
| Family | Location and role | Typical rating | Key equipment |
|---|---|---|---|
| Main LV Switchboard | Transformer or generator output; the main distribution point of the installation | 630–7000 A; Icw up to 100 kA | ACB incomers and bus-ties, main busbar, metering, forms 2b–4b |
| MCC | Pumps, fans, chillers, compressors and process drives | 0.37–250 kW per drawer; bus 630–4000 A | Withdrawable drawers, DOL / star-delta / soft-starter / VFD units |
| ATS / AMF Panel | Generator plant, UPS input and output, prefab power modules | Up to 6300 A; 16–18 sets per campus building | Automatic transfer, generator paralleling, quick-plug connectors, UL 1008 option |
| PFC Panel | Beside the main switchboard or in a compensation room | 12.5–1000 kvar; ≤ 450 V | Capacitor stages, detuned reactors, thyristor switching ≤ 20 ms |
Design principles
Standards and design principles
IEC 61439 verification
Temperature rise, short-circuit withstand, dielectric strength, IP and mechanical strength are verified on the assembly as a system, not on the components alone. Routine tests follow on every board.
Busbar and short-circuit design
Main and distribution busbars are sized for continuous current, Icw and Ipk with support spacing set by electrodynamic force; copper is processed on CNC lines in-house.
Forms of separation
Form 1 to 4b internal partitioning is selected by the maintenance regime: higher forms where work must continue on live boards.
Enclosure and ambient
IP rating, ventilation and derating are set by dust, moisture, altitude and ambient temperature at the site.
Production process
From enquiry to commissioning
Design, production and testing sit under one roof, so responsibility stays at one point from the first drawing to site support.
- Enquiry and analysisSend a single-line diagram, load list or panel schedule. An engineer confirms voltage, short-circuit level, forms of separation and applicable standards within 24 hours.
- Proposal and drawingsBudgetary quotation in five working days, then general-arrangement drawings, busbar sizing and a bill of materials for approval.
- Order and engineeringApproved drawings release procurement of Schneider, ABB or specified components and sheet-metal programming.
- Fabrication and assemblyLaser cutting, CNC bending, powder coating, busbar processing, primary assembly and secondary wiring in Shaoshan.
- Factory acceptance testDielectric, loop-resistance, insulation, earth-continuity, IP and current-injection tests; customers and consultants welcome to witness.
- Delivery and after-salesExport packing, sea or air freight, commissioning support and a 7×24 service line with Schneider-trained engineers.
Let's confirm the right board for your project
Send a single-line diagram, load list or a plain list of requirements. Our engineers set the board type, form of separation and ratings with you.