Ring Main Unit Type GR1

A) Key Features

• SF6 gas insulation and current interruption - No fire hazard
• Maintenance free and sealed for life contact system
• Outdoor installation
• Robust construction
• Tee-off circuit breaker with integral protection system
• Low cost cable termination
• Fully extensible options
• Internal arc-fault proven
• Motorised
• Protection Relay

B) Safety

Tamco regards safety as the most important aspect of switchgear design and operation, and the following proven safety features have been built into the type GR1.

• No exposure to live parts
• Passive interlocks to prohibit unintended operations
• Comprehensive padlocking facilities
• Mimic diagram and position indicators to guide the operator
• Full fault rated earthing switches
• Arc fault tested

C) Compliance

Tamco operates a quality system in line with ISO 9001.
In addition to in-house routine and type tests, all switchgear products are short-circuit proven at independent test stations. The type GR1 has been tested and certified by KEMA.

Compliance with:

• IEC60056:1987, BS5311:1988 Tee-off Circuit Breaker
• IEC60265:1983, BS5463:1977 Ring Switch
• IEC60129:1984, BS5253:1975 Earthing Switch

Temperature Range +40°C to -25°C

D) Specification

• Rated Voltage: 12kV
• Impulse Withstand Voltage: 95kVp
• Frequency: 50Hz
• Normal Current, Ring Switch: 630A
• CB: 630A
• Short-circuit Breaking Current, CB: 20kA
• Short-time Withstand Current: 20kA’ , 3 Seconds
• Short-circuit Making Current: 50kAP
• Ring Switch: 50kAP
• Earthing Switch: 50kAP