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Get all the benefits of our Ringmaster RN2d with the advanced communication and automation using Easergy T300:


Ringmaster RN2d

  • Robust switch and circuit breaker mechanism
  • New VIP4 series of self powered protection 

  • Earth screened gas enclosure 
  • Modern extendable architecture

  • Suitable for outdoor/ indoor (IP54)
  • Minimal footprint

  • Flexible communication media
  • Future-proof digital solution

Easergy T300

  • MV/ LV control and monitoring
  • Directional FPIs

Simple & Flexible
  • Compact and modular
  • Modern extendable architecture

  • Open protocol
  • Secure Wi-Fi access

  • Meets latest cyber security standards
  • Role based access control

Smart Ringmaster Unit

  • Future ready - designed to meet today's and tomorrow's electrical network challenges

  • Smart grid-ready - advanced monitoring, control and automation functions 

  • Reduce outage times - advanced fault detection features

  • Network protection - rely on a well-known UK manufacturer and 100 years expertise
  • New Ringmaster RN2d

    Ringmasters RN2d compact, robust design delivers reliable performance, both indoors and outdoors, from commercial applications to the harshest of industrial environments.
    RN2d has a high-level reliability, safety and flexibility. It is an SF6 Insulated Ring Main Unit (RMU) for medium voltage networks up to 13.8kV with improvement guided by customer feedback and design failure mode and effect analysis (DFMEA).
  • Easergy T300

    The new benchmark in power distribution automation.

    A modular platform of hardware and firmware, and an application building block for medium voltage and Low Voltage public distribution network management. It offers a single solution for control and monitoring, from a simple pole-top device to a large MV/ MV or MV/LV substation.
  • 30 years of Great British engineering

    Launched as the Ringmaster Ring Main Unit(RMU) in 1987, the Ringmaster was the first gas-insulated RMU on the UK market. 
    Traditional RMU's had been oil filled making them time-consuming to test and service. The first Ringmaster was safer, smaller, cleaner and easier to operate than the competition. 
    This produced efficiency savings for Schneider Electric's customers and set the standard for the future.

Ringmaster Summary

RN2D (full version)
RN2D (full version)
New facia
Enhanced DFMEA RSW Mechanism
Enhanced through DFMEA CB Mechanism
Bushing Type Short Short or Type C
Internal Arc cable Box (13.1kA) 13.1kA - 21kA
Internal Arc Enclsoure (21kA)
Anti Theft Earth
Quality Improvements
ENA 41-38 Issue 3
New Designation / No Saturation
VIP 400

    Transitioning to a Smart Grid

    How can you maintain power quality?

    With widespread integration of distributed energy resources along the network, Smart Grid capabilities are being introduced into MV/LV substations to maintain power quality and achieve greater service continuity.

Excellence Redefined



More robust Switch & Breaker mechanism

Short (Type A) or Type C bushing 

New VIP400 relay with advanced protection features

Earth circuit re-designed for anti-theft 

VPIS functioning from minimum of 6.6kV



Additional test access points for Switch function

Improved front facia with easy to read mimic


Easy to install & maintain



Improved Internal Arc performance 

Metalised screen tank offers touch proof feature

Insensitive to harsh environment

Complies to latest seismic standards



New Easergy T300 FRTU for advanced communication

MV/LV control & monitoring 

Compact & modular, configurable to your needs

Flexible communication media (ethernet, USB, GPRS, 3G, PSTN, Radio)

Complies to latest cyber security standards

Ringmaster RN2d features


Nickel coated epoxy tank

A touch proof safety feature which is insensitive to harsh environments. The cable box has also been redesigned to meet the Internal arc classification of 13.1kA (AF). Internal arc design in accordance with the latest international standards, also manufactured in our IEC ISO9001-certificated UK facility.

Every part is built for total reliability

RN2d is an SF6 insulated ring main unit for medium voltage networks up to 13.8kV. Additional test access connections for ring switch cable testing. One of the many features of RN2d is our VIP protection relays. To discover in detail our New VIP400 self powered microprocessor-based protection relay.

History of Ringmaster



Outdoor oil filled ring main unit using HRC fuse switch technology


First gas-insulated Ringmaster Ring Main Unit (RMU)


RN2c version launched


Latest evolutions launched - RN2d, RN6d, RE2d & RE6d - reliable, safe, flexible and smart
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