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HV & LV Switchgear

Metal-clad MV switchgear (KYN28), SF6 ring main units and IEC 61439 low-voltage boards (GGD, GCS, MNS).

Front of metal-clad medium-voltage switchgear panels

Medium- and low-voltage switchgear

MARS builds metal-clad withdrawable MV switchgear (KYN28A-12, KYN61-40.5) to IEC 62271-200, SF6 and solid-insulated ring main units to IEC 62271-200/-103, and fixed or withdrawable low-voltage switchboards (GGD, GCS, GCK, MNS) to IEC 61439-1/-2 — with vacuum or SF6 circuit breakers, protection relays, metering and busbar systems to 4,000 A. Panels are assembled and wired at dedicated stations and dielectric, mechanical-operation and IP tested cabinet by cabinet.

Range

  • MV: 12, 24, 36 and 40.5 kV; 630–4,000 A; 25–40 kA; internal-arc classified IAC AFLR; LSC2B-PM.
  • RMU: 2–5 way, load-break switch / fused / breaker functions, SF6 or solid insulated, motorised with SCADA interface.
  • LV: 400–1,000 V; up to 6,300 A main busbar; forms 2b to 4b; ACBs, MCCBs, MCC drawers, power-factor correction.
  • Enclosure: cold-rolled or stainless steel, IP4X indoor to IP65 outdoor.

Read RMU vs metal-clad switchgear or see a representative 11 kV commercial lineup.

FAQ: HV & LV Switchgear

When should I choose a ring main unit instead of metal-clad switchgear?

An RMU is a compact, sealed, largely maintenance-free unit for 2–5 circuits with load-break switches and a fused or breaker transformer feeder — right for distribution networks and compact substations. Metal-clad switchgear is for primary distribution with many feeders, high fault levels, full relay protection and future extension.

Which circuit breakers do you use?

Vacuum circuit breakers (VD4-type or equivalent Chinese-made) as standard at MV; ABB, Schneider, Siemens, Chint or Delixi ACBs and MCCBs at LV — the brand is specified by the buyer.

Are your panels type-tested?

Designs are type-tested to IEC 62271-200 and IEC 61439 with internal-arc classification; test certificates are provided with the offer. Every production panel is routine-tested for dielectric withstand, mechanical operation, wiring and IP.

Can switchgear be shipped fully assembled?

Lineups are shipped in transport units of 2–4 panels with busbar links, packed in fumigation-free crates; reassembly on site is by bolted busbar joints with torque-marked connections.