SF6 Gas
Load Break Switch

Rated voltage (kV) 24 / 36
Model/Type ORAP21-396-20MT
Switching operation class E 3
Mechanical endurance class M 2

Insulation Lightning impulse withstand voltage

– To earth and between phase (kVpeak)

– Across the isolating distance (kVpeak)

Power frequency withstand voltage

– To earth and between phase (kV)

– Across the isolating distance (kV)

125 / 170

145 / 195

50 / 70

60 / 80
Rated frequency (Hz) 50
Rated normal current (A) 630 / 630
Rated systematical interrupting current (A) 630
Rated short-time withstand current (kArms) 12.5, 16* / 12.5, 16*
Rated short-circuit making current (kApeak) 31.5, 40* / 31.5, 40 *
Rated short-circuit duration (second) 1
Rated mainly active load breaking capacity (A) 630
Number of operations at rate normal current interruption (cycle) 400
Mechanical endurance, in number of operation (cycle) 10,000
Rate filling pressure (kgf/cm2) 1.2
Pressure of SF6 when locking device operate (kgf/cm2) 0.8
IP class IP67
Cable spacing (C), (mm.) 250
Cable spacing (C), (mm.) 2.5
Weight (kg.) Min. 150 / Min. 235
Dimension (W x L x H) (mm.) 1,060 x 1,063 x 555 / 1,155 x 1,063 x 555
Standard IEC60265-1, IEC60694

SF6 Gas-insulated Ring Main Unit

Model RINGMAINUNIT
Function unit C
load break
switch unit		 F
combination
electrical unit		 V
vacuum circuit
breaker unit
Rated voltage (kV) 24 24 24
Rated current (A) 630 200 630
Rated withstand current (kA/4s) 20 / 20
Rated short-circuit closing current (peak) 50 / 50
Electrical lifespan (number of operations) E2 / E2
Rated short-circuit breaking current (kA) / 31.5 20
Short-circuit closing capability of the
grounding switch 		E2 / E2
Internal arc test AFLR (kA/1s) 20 / 20
Mechanical life of the circuit breaker
(number of operations) 		/ / 10000
Mechanical life of the isolation switch
(number of operations) 		/ / 5000
Mechanical life of the load break switch
(number of operations) 		5000 5000 /
Mechanical life of the grounding switch
(number of operations) 		3000 3000 3000
Power frequency withstand voltage (across
the air gap) (kV) 		79 79 79
Power frequency withstand voltage (phase
to-phase, phase-to-ground) (kV) 		65 65 65
Lightning impulse withstand voltage (across
the isolation gap) (kV) 		145 145 145
Lightning impulse withstand voltage (across
the air gap, phase-to-phase, phase-to
ground) (kV)		 125 125 125
Annual leakage rate (%/year) 0.01% 0.01% 0.01%
Degree of protection (gas tank) IP68 IP68 IP68
Cabinet width (mm) 360 360 360

Solid Dielectric
Load Break Switch

Normal System Voltage (kV) 25.8 36
Rated Current (A) 630 630
Nominal Frequency (Hz) 50 50
Impulse Withstand Voltage (kV) 125 170
Power Frequency Withstand 50 50
Symmetrical Interrupting Current –Isc (A RMS) 630 630
Short Time Withstand Current (kA RMS) 12.5 , 16 12.5 , 16
Making Current (kA Asymmetrical Peak) 31.5 , 40 31.5 , 40
Applied Standard IEC 62271-103
Creepage Distances (Line to Ground) 860 mm
Centerline Spacing Between Phases 310 mm
Arc-Extinction Medium Vacuum interrupter
Insulation Material Hydrophobic Cycloaliphatic Epoxy Resin
Mechanism Duty Operations 10,000 cycle
Mechanical Operations Manual / Electrica
Current Transformer 600:1 A, Class 10P20
Operating Temperatures -40 °C to 55 °C
Weight (kg) 110

Automatic Circuit Recloser

 Nominal system voltage (kV)  27 38
 Rated current (A) 630 800
 Rated frequency (Hz) 50 50
 Impulse withstand voltage (kV) 125 170
 Power frequency withstand –Dry (kV) 60 70
 Power frequency withstand –Wet (kV)
 50 60
 Symmetrical interrupting current –Isc (kArms)  12.5/16 16
 Short time withstand current (kArms)  12.5/16 16
 Making current (kA asymmetrical peak)  31/40 40
 Creepage distances (line to ground) (mm.) 840  
 Centerline spacing between phases (mm.) 310/350/380  
 Arc-Extinction medium Vacuum interrupter  
 Insulation Material Hydrophobic Cycloaliphatic Epoxy Resin  
 Mechanical operations (cycle) 10,000  
 Voltage sensor accuracy (%)  1% or 3%  
 Current transformer accuracy class 1000:1A, Class 3  
Operating Temperatures -40 °C to 65 °C  
Weight (kg) 140  

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