MV Switchgear
MV switchgear switches and protects power at medium voltage, typically 13.8kV or 33kV on SEC-fed Saudi sites, ahead of the step-down transformer that feeds the LV board. NLS Power sources metal-enclosed MV switchgear built to IEC 62271-200, vacuum circuit breaker technology, and internal arc classification for substation and plant rooms.
MV switchgear is the switching and protection point between the utility or generation source and a site's step-down transformers, working at the medium voltage classes Saudi Electricity Company runs on its distribution network, most commonly 13.8kV and 33kV, with some industrial and Aramco sites running 6.6kV or 11kV internal networks. A ring main unit or a full switchboard sits at this level, controlling incoming supply, transformer feeders, and any bus coupling between sections.
Metal-enclosed construction to IEC 62271-200 is the reference for this equipment class, and it defines loss of service continuity (LSC) categories that describe how much of the switchboard stays operational while one compartment is opened for maintenance, plus partition classes that describe what separates live parts from the compartment a technician works in. Internal arc classification (IAC), tested and rated under IEC 62271-200 Annex AA, matters because an internal fault at 13.8kV or 33kV carries enough energy to threaten the people working near the panel, and an IAC-rated panel directs that energy away from the operator side.
Switching devices at this voltage are almost always vacuum circuit breakers to IEC 62271-100 now, vacuum having displaced SF6 and oil breakers across most new-build Saudi projects on cost, maintenance and environmental grounds. Protection relays on each feeder coordinate with the LV switchgear downstream and with any upstream utility protection, so relay setting coordination is part of the switchgear package, not an afterthought added after delivery.
NLS Power sources MV switchgear to IEC 62271-200, in air-insulated or gas-insulated construction, sized to the voltage class, busbar rating and fault level a project's protection study specifies. Quoting works from the single line diagram, the voltage class, the number of panels and feeder types, and the required IAC rating; NLS Power returns pricing in USD with lead time set by the panel count and any factory acceptance testing the project specifies.
Specifications
- ✓Metal-enclosed construction to IEC 62271-200 with defined loss of service continuity (LSC) categories
- ✓Voltage classes matched to SEC distribution levels: 13.8kV and 33kV, plus 6.6kV/11kV for industrial internal networks
- ✓Vacuum circuit breakers to IEC 62271-100 as the standard interrupting device
- ✓Internal arc classification (IAC) tested to IEC 62271-200 Annex AA for operator-side safety
- ✓Air-insulated (AIS) or gas-insulated (GIS) construction depending on footprint and site conditions
- ✓Protection relay coordination with upstream utility protection and downstream LV switchgear
Frequently Asked Questions
What voltage does MV switchgear run at in Saudi Arabia?+
Most SEC-fed sites use 13.8kV or 33kV switchgear ahead of the step-down transformer, while some industrial and Aramco facilities run internal networks at 6.6kV or 11kV. The exact class comes from the utility connection agreement or the site's own generation study.
Why does internal arc classification matter for MV switchgear?+
An internal fault at medium voltage releases enough energy to injure anyone standing in front of the panel. IAC testing under IEC 62271-200 Annex AA confirms the enclosure directs that energy away from the operator access side rather than venting it outward.
What lead time should I expect for MV switchgear in Saudi Arabia?+
Lead time depends on panel count, voltage class, and whether the project requires a witnessed factory acceptance test before shipment. NLS Power confirms a delivery schedule once the single line diagram, voltage class and IAC rating are fixed, rather than quoting a generic figure upfront.