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Home > Ring Main Units (RMU) > Air-Insulated Ring Main Units > XGN15 Series Air-Insulated Ring Main Units

XGN15 Series Air-Insulated Ring Main Units

Compact air-insulated medium-voltage ring main units for secondary distribution networks, featuring SF₆ load break switch, switch-fuse and vacuum circuit breaker configurations for switching, protection and power distribution.

Available in flexible functional configurations for ring feeder arrangements, transformer protection, feeder protection, metering and monitoring requirements.

Key Ratings

  • Available Rated Voltages

    7.2 / 12 / 17.5 / 24 / 36 / 40.5 kV

  • Typical System Voltages

    6 / 6.6 / 10 / 11 / 13.8 / 15 / 20 / 22 / 30 / 33 / 34.5 / 35 kV

  • Rated Current

    630 / 1250 A

  • Rated Short-Time Withstand Current

    Up to 31.5 kA

  • Insulation Medium

    Air

Available Configurations

  • 01

    Load Break Switch Unit

    Ring feeder switching and sectionalizing with SF₆ load break switch.
  • 02

    Switch-Fuse Unit

    Transformer feeder protection using an SF₆ load break switch combined with high-voltage fuse-links.
  • 03

    Vacuum Circuit Breaker Unit

    Incoming and transformer feeder switching and protection with vacuum circuit breaker.
  • 04

    Voltage Transformer Unit

    Voltage measurement, protection and monitoring according to project requirements.
  • 05

    Metering Panel

    Instrument transformer arrangements for metering requirements.

Technical Specifications

A. General Electrical Ratings

Rated Voltage 7.2 kV 12 kV 17.5 kV 24 kV 36 kV 40.5 kV
Typical System Voltages 6 / 6.6 kV 10 / 11 kV 13.8 / 15 kV 20 / 22 kV 30 / 33 kV 34.5 / 35 kV
Rated Frequency 50 / 60 Hz 50 / 60 Hz 50 / 60 Hz 50 / 60 Hz 50 / 60 Hz 50 / 60 Hz
Power-Frequency Withstand Voltage 20 / 23 kV 28 / 32 kV 38 / 45 kV 50 / 60 kV 70 / 80 kV 80 / 90 kV
Lightning Impulse Withstand Voltage 60 / 70 kV 75 / 85 kV 95 / 110 kV 125 / 145 kV 170 / 195 kV 185 / 215 kV
Insulation Medium Air
Degree of Protection IP4X enclosure
Installation Indoor
Applicable Standards IEC 62271-1 / IEC 62271-200

Note: The first value refers to phase-to-earth and phase-to-phase insulation; the second value refers to across the isolating distance

B. Functional Unit Ratings

Parameter Load Break Switch Unit Switch-Fuse Unit Vacuum Circuit Breaker Unit
Applicable Rated Voltage 7.2 – 40.5 kV 7.2 – 40.5 kV 7.2 – 24 kV
Rated Current 630 / 1250 A According to fuse-link selection 630 / 1250 A
Rated Short-Time Withstand Current 20 kA According to configuration Up to 31.5 kA
Rated Short-Circuit Breaking Current Not applicable According to fuse-link configuration Up to 31.5 kA

Standards, Testing & Documentation

IEC-Oriented Design

IEC-Oriented Design

Designed with reference to applicable IEC requirements and project specifications.

Factory Routine Testing

Factory Routine Testing

Routine tests are carried out before shipment according to product configuration.

Project Documentation

Project Documentation

Technical datasheets, drawings and test records can be provided for project review.

Download Product Catalogue

Discuss Your Air-Insulated RMU Requirements

Share your system voltage, feeder arrangement, required functional units and project specifications with our engineering team.

Request a Quote Talk to Our Engineers

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© 2026 TOONICE. All rights reserved.

Manufactured by Toonice Electric Power Technology Co., Ltd.

Exported by Wenzhou Naisite Electric Co., Ltd.

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