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SF₆-Free Ring Main Units
SF₆-free medium-voltage ring main units for secondary distribution networks, using dry air as the insulation medium to provide compact switching, protection and distribution functions without SF₆ gas.
Available in flexible functional configurations to suit different system voltages, feeder arrangements, protection, metering and automation requirements.
Why SF₆-Free?
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Why Replace SF₆?
SF₆ has long been used in medium-voltage switchgear for its excellent dielectric performance and compact design. However, its very high global warming potential is accelerating the transition toward SF₆-free alternatives.
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Dry-Air Insulation
TOONICE SF₆-Free RMUs use dry air as the insulation medium, avoiding SF₆ while maintaining the switching, protection and distribution functions required for secondary distribution networks.
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Supporting the SF₆-Free Transition
SF₆-free switchgear supports projects seeking lower environmental impact, alignment with evolving F-gas requirements, and a transition toward lower-GWP medium-voltage technologies.
Available Configurations
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Vacuum Circuit Breaker Unit
Incoming, outgoing and transformer feeders with vacuum interruption for switching and protection, with relay protection available according to project requirements. -
Voltage Transformer Unit
Voltage measurement, protection and monitoring, with isolating arrangements available according to project configuration. -
Metering Panel
Instrument transformer arrangements for project metering and measurement requirements.
Technical Specifications
Note: The first value refers to phase-to-earth and between phases; the second value refers to across isolating distance.
Standards, Testing & Documentation
IEC-Oriented Design
Designed with reference to applicable IEC requirements and project specifications.
Factory Routine Testing
Routine tests are carried out before shipment according to product configuration.
Project Documentation
Technical datasheets, drawings and test records can be provided for project review.
Discuss Your SF6-Free RMU Requirements
Share your system voltage, configuration requirements and project specifications with our engineering team.
MV & LV Equipment Manufacturer · Wenzhou, China
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