XNRM6-12 SF6 Ring Main Unit

XNRM6-12 SF6 Gas-Insulated Ring Main Unit

XNRM6-12 gas-insulated ring main units house medium-voltage switching components in a sealed stainless-steel tank for 12 kV cable networks. SF6 insulation and a compact common-tank design bring multiple circuit functions together where installation space is limited.

The series offers load-switch, switch-fuse, circuit-breaker and cable-incoming units, with additional bus-coupler, metering and PT options. These can be combined for the feeder and protection scheme. A sealed 3 mm stainless-steel tank protects the internal switching components.

Technical Specifications

Rated Voltage	12 kV
Insulation Medium	SF6 gas
Switching Units	C: load switch; F: switch-fuse; V: circuit breaker; D: cable incoming
Gas Tank Construction	Sealed 3 mm stainless-steel tank

Key Features

Sealed SF6 insulation helps reduce routine maintenance; inspection follows the equipment manual and site conditions.
Stainless-steel tank for harsh / wet environments.
Flexible multi-unit configurations (load-switch, breaker, metering).
Compact for urban cable ring-main points.

Typical Applications

Compact transformer substations
Industrial park ring networks
Commercial building substations

Installation & Aftercare

Prepare the site, plan routine checks and keep service records.

What needs to be ready before installation?

Match the unit lineup and cable connector interfaces to the station drawing; reserve termination and operator access space.
Provide a stable foundation, station earthing and the specified pressure-relief path; confirm extension interfaces if later expansion is planned.
Protect external mechanisms and cable areas from moisture and contamination even though primary equipment is enclosed in a sealed stainless-steel tank.

What should operators check during routine rounds?

During rounds, inspect external indications, enclosure condition and any fitted gas-pressure gauge or alarm.

What is covered during planned maintenance?

At planned isolation, qualified personnel check operating mechanisms, interlocks, cable interfaces and earthing connections.
Investigate gas alarms, damaged cable interfaces or unreliable position indication; opening the sealed tank is not routine maintenance.

Customization Options

Define the electrical configuration and the details needed for your site.

Network arrangement: Incoming ring circuits, transformer feeders, terminal supplies and future extension requirements.
Switching units: C load-switch, F switch-fuse, V circuit-breaker and D cable-incoming modules to the required network scheme.
Protection & metering: Fuse or relay protection arrangement, CT ratios, metering and fault-indication requirements.
Cable interfaces: Cable count, cross-section, termination type and earthing connections.
Controls & enclosure: Operating mechanism, auxiliary supply and remote signalling; enclosure and site conditions for engineering review.

Project-specific options and accessories are confirmed in the quotation and approved drawings.