The switches RELF and RELF ex are:

• air insulated (AIS)
• in metal casing
• completely metal clad
• of type retractable
• equipped with a single main bar
• available for nominal voltages up to 36 kV
• designed exclusively for indoor use

Main electrical data:

RELF:

• Nominal voltages: 12 / 17.5 / 24 / 36(40.5)* kV
• Rated current (main and input bars): 630 A to 4000 A
• Power frequency withstand voltage: 28 / 38 / 50 / 95 kV
• Atmospheric impulse withstand voltage: 75 / 95 / 125 / 190 kV
• Rated frequency: 50 Hz
• Permissible short-circuit current (3 s): up to 40 kA
• Permissible peak current: up to 100 kA
• Internal arc resistance: up to 31.5 kA/1 s or up to 40 kA/0.5 s
• Protection degree: up to IP4X (IP3X for 4000 A current)
• Cabinet dimensions:
• Height: 2200 – 2250 mm
• Width: 600 – 1000 mm
• Depth: 1250 / 1575 / 1675 mm

RELF ex:

• Nominal voltages: 12 / 17.5 kV
• Rated current: 630 – 2500 A
• Power frequency withstand voltage: 28/38 kV
• Atmospheric impulse withstand voltage: 75 / 95 kV
• Rated frequency: 50 Hz
• Permissible short-circuit current (3 s): up to 25 kA
• Permissible peak current: up to 63 kA
• Internal arc resistance: up to 25 kA/1 s
• Protection degree: up to IP4X
• Cabinet dimensions:
• Height: 2250 mm
• Width: 650 / 800 / 1000 mm
• Depth: 1375 / 1388 mm

Compliance with standards:

• (PN-EN) IEC 62271-200
• (PN-EN) IEC 62271-1

Terms of use:

• Ambient temperature:
• short-term maximum: +40°C
• daily average maximum: +35°C
• annual average: +20°C
• long-term minimum: -5°C
• Relative air humidity:
• maximum daily average: 95%
• maximum monthly average: 90%
• Water vapor pressure:
• maximum daily average: 2.2 kPa
• monthly average maximum: 1.8 kPa
• Atmosphere at the installation site:
• without significant contamination with salt, vapors, dust, smoke, flammable or corrosive gases
• without ice, frost or condensation
• Installation altitude: up to 1000 m above sea level
• Vibrations: negligible (without significant external influences or earthquakes)