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Catalogue RMU.02.2018
SRMP12
12kV, 21kA, SF6 GAS INSULATED
RING MAIN UNIT
Ring Main Unit is a compact unit to connect, supply and
protect transformers on a radial or an open ring power
network. The primary function of RMU includes detecting
electrical fault and breaking fault currents as required.
RMU offers various advantages in terms of compact size ,
minimal maintenance, high product quality with reliable
operation, ease in installation, independent to
environmental conditions, reduced operating cost and
better personal safety.
Salient Features
High Degree of Reliability and Safety
Virtually Maintenance Free
Suitable for Indoor and Outdoor Application
Reduced Total Cost Considering Space Requirement
Compatible for Manual and Motorized Remote/SCADA
Operation
Conforms to IEC 6227-100 / 102 / 103 / 200 &
IEC 62271-1 / IS 13118
Arc Interruption in Vacuum and SF6 Gas for Insulation
RMU is Designed for Internal Arc Classification for
12kV, 21kA IAC AFLR for 0.1 & 1 sec
Manual and Motorized Three Position Load Break Switch
and Off-load Dis-connector cum Earth switch
All Safety Interlocks are provided
Extensible on Both LH & RH Side (optional)
Application
Utility Distribution Networks
Offices, Hotel Buildings and Other Commercial
Establishment
Contaminated or Polluted Areas
Underground Substations
Railways & Airports
Small Industries and Solar Power Plant
SRMP12
12kV, 21kA, SF6 GAS INSULATED RING MAIN UNIT
Technical Specifications
Parameters
Unit
SRMP12
Rated Voltage
kV
12
Rated Frequency
Hz
50/60
Rated Main Bus Bar Current
A
630
Rated Feeder Current
A
630
Rated Insulation Level*
kV
12/28/75 & 12/38/95
VCB, LBS and ES Rated Short Time Current for 3 sec
kA
21
Rated Active Load Breaking Current to the LBS
A
630
Rated Short-Circuit Breaking Current of the Vacuum Circuit Breaker
kA
21
Rated Short-Circuit Making Current of the VCB/LBS
kA
52.5
Rated Operating Sequence for VCB
O-0.35-CO-3M-CO
Insulating Gas System
Insulating Gas
SF6
Minimum Gas Pressure Level For Insulation
Bar
0.2 G
Rated Gas Filling Pressure Level For Insulation
Bar
0.4 G
Lock Out Pressure
Bar
0.2 G
Degree of Protection
Gas Filled Compartment
IP 67
Enclosure
IP 55
Panel Overall Dimensions
Height (H)
mm
2100
Width (W)
mm
1044*
Depth (D)
mm
820
Applied standard
IEC 62271-200
*Width would vary as per no. of variants.
C
C
V
3 WAY RMU:- CCV
FRONT VIEW
SIDE VIEW
Typical G.A Drawing for Ring Main Unit Panel
There is a continuous effort at Stelmec to keep abreast of latest technology in line with customers’ requirements and hence the
product specifications are subject to change.
Products described in this catalogue are manufactured and supplied according to Certified Management System ISO 9001:2015.
stelmec
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SBU – I (Medium Voltage Switchgear Division – I) CORPORATE
®
Plot No. 52 to 62, Off Ahmedabad-Sanand Road,
Ularia, Tal. Sanand, Dist. Ahmedabad - 382 110
Tel: +91 9909040321 / 22 / 24 / 25
Email: marketing.ahd@stelmec.com
'Sea Queen', 43-A, H.K. Bhabha Road,
Bandstand, Bandra (W), Mumbai - 400 050
Tel: +91 22 2643 6127 / 28 / 29
E-mail: corporate@stelmec.com
website: www.stelmec.com