Ring Main Unit - GR1

• Rated service voltage: 12kV
• Rated frequency: 50/60 Hz
• Rated power frequency withstand voltage: 38kV
• Rated impulse withstand voltage: 95kVp
• Ring switch current rating: 630A
• Rotating arc circuit breaker rating: 630A
• Busbar rating: 630A
• Short time withstand current: up to 20kA 3 seconds
• Internal arc fault withstand: up to 20kA 1 second
• Full fault rated earthing switch

• Outdoor installation
• Totally sealed metal enclosed switchgear
• Extensible type available
• Tee-off circuit breaker with integral protection system
• Motorised mechanism available
• Integral cable test facility for ring switch (optional for tee-off circuit breaker)
• Protection relay and metering application option
• Flexible configurations – built up from basic building blocks consisting of ring switches and circuit breakers.