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Schneider SM6 24 kV Medium Voltage Ring Main Unit
Model: SM6-36
4-hour response · Pricing in SAR · Delivery across all KSA regions
SM6-36 — Schneider SM6 24 kV Medium Voltage Ring Main Unit
The Schneider Electric SM6 is a 24 kV medium-voltage ring main unit (RMU) in a metal-enclosed, gas-filled (SF6) switchgear design combining two cable feeder positions and one transformer protection position in a compact, sealed cabinet suitable for indoor and outdoor substation installation. The SM6's sealed SF6 pressure system requires no gas monitoring, no gas refilling over the product life, and no periodic maintenance of the arc chamber — replacing the labour-intensive air-insulated switchgear maintenance programmes that characterise older MV switchgear installations in Saudi Arabia's legacy substations. Its triple functions of ring-main switching, isolation, and transformer circuit protection are provided by rotating switch-disconnector blades and a fuse or circuit breaker in the transformer position, providing full IEC 60265-1 and IEC 60470 switch-fuse protection against both overcurrent and earth fault conditions.
The SM6 is available in 12 kV and 24 kV versions with ratings up to 630 A and 25 kA short-circuit withstand, and in configurations from the basic RMU to extensions with additional cable feeder positions, bus sections, and Sepam digital protection relay integration. The sealed enclosure's IP3X degree of protection is standard, with IP65 available for outdoor applications common in Saudi Arabia's industrial sites and residential distribution substations. Loss-of-continuity (LOC) indicators are factory-fitted on all positions, enabling visual identification of energised and de-energised positions by SEC-licensed switchgear operators without opening the cabinet.
In Saudi Arabia, the SM6 RMU is the most widely deployed MV ring main unit in the SEC distribution network, installed at thousands of 13.8 kV and 24 kV distribution substations serving commercial, industrial, and residential customers across the Kingdom. Major Saudi Vision 2030 developments — NEOM, ROSHN, and Red Sea Project — specify SM6 units as the MV switchgear standard for their internal 13.8 kV distribution ring main systems, and ARAMCO's downstream distribution infrastructure continues to expand with SM6 units at new facility connection points.
Razz Middle East supplies SM6 RMUs with full SEC-approved documentation, Sepam relay integration, and coordination with SM6 installation crews for Saudi substation projects. We maintain a service team for SM6 commissioning, functional testing, and protection relay settings for new and retrofit projects across Riyadh, Jeddah, Dammam, Jubail, and Yanbu.
Technical Specifications
Full specifications for the SM6-36
- Voltage
- 24 kV (12 kV also available)
- Rated Current
- Up to 630 A
- Short-Circuit
- 25 kA (1 second)
- Insulation
- SF6 sealed gas
- Configuration
- 2 feeder + 1 transformer (standard RMU)
- Protection Position
- Switch-fuse or circuit breaker
- Enclosure
- IP3X standard, IP65 outdoor
- Standard
- IEC 60265-1, IEC 60470
Key Features & Benefits
- SF6 sealed gas system requires no periodic gas monitoring, refilling, or arc chamber maintenance over the product lifetime, eliminating the ongoing maintenance cost of air-insulated switchgear.
- Compact sealed design integrates two ring feeder positions and one transformer protection position in a single cabinet footprint smaller than equivalent air-insulated assemblies, saving substation building area.
- IP65 outdoor enclosure option eliminates the requirement for an indoor switchroom building at remote distribution points, reducing civil works cost at new Saudi industrial estate and residential substation installations.
- Loss-of-continuity (LOC) indicators on all positions provide visual energised/de-energised status confirmation without opening the cabinet, satisfying SEC operational safety procedures.
- Sepam protection relay integration option provides digital overcurrent, earth fault, and protection relay functions in the transformer position — replacing separate relay panels in compact substation designs.
- IEC 60265-1 and IEC 60470 switch-fuse combination provides proven protection against transformer inrush and fault currents, with a coordinated operating characteristic that clears transformer faults without affecting the ring feeder.
- Modular extension positions (additional feeder, bus section, measurement) can be added to the base RMU to create extended switchgear lineups — enabling substation growth without replacing the base SM6 unit.
Industrial Applications in Saudi Arabia
- SEC 13.8 kV and 24 kV distribution network ring main substations across the Kingdom, where SM6 is the standard RMU approved for new and replacement MV switchgear installations in SEC's technical specification.
- NEOM internal 13.8 kV distribution ring main system substations, where SM6 units serve as the MV switching points for the smart city's underground cable distribution network.
- ROSHN residential community 13.8 kV distribution substations across Riyadh, Jeddah, and Al Khobar, where SM6 compact footprint minimises substation building size in land-constrained residential plot layouts.
- Red Sea Project resort island 13.8 kV distribution substations, where SM6's IP65 outdoor rating eliminates switchroom civil works cost at remote island locations.
- ARAMCO 13.8 kV downstream distribution extension substations at new production facility connection points in the Eastern Province, where SM6 units meet ARAMCO's SAES-P electrical engineering standards.
- MODON industrial estate 13.8 kV tenant connection substations across Riyadh, Jeddah, Dammam, and Jubail industrial cities, where SM6 RMUs provide metered MV connections to large industrial tenant facilities.
- University and hospital campus 13.8 kV ring distribution substations, where the compact SM6 provides reliable MV switching in the constrained substation rooms of campus electrical infrastructure.
Industrial Supplier in Saudi Arabia
Get a Quote for the Schneider SM6 24 kV Medium Voltage Ring Main Unit
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Frequently Asked Questions — SM6-36
Common questions from buyers in Saudi Arabia and the GCC