KRAH GROUP
RAG_OBGR model
GENERAL CHARACTERISTICS
Resistor in protected version, assembled in banks with high specific power, available in both single-phase configuration (typically used for braking large inverter-driven motors, or as an earthing resistor for systems with operating voltages up to 1000 V) and three-phase configuration (as a load bank or step starting resistor for wound-rotor motors).
The specific configuration of the grid elements making up the bank gives this resistor particularly quiet operation during braking when the latter is chopper-controlled, together with high mechanical strength, making it especially suitable for all applications subject to vibration or shock (for example on overhead travelling cranes).
ELECTRICAL CHARACTERISTICS
OPTIONAL
ELECTRICAL CHARACTERISTICS
- Tolerance ±10%
- Temperature coefficient: Depending on the type of material used
- Maximum applicable voltage: 1000 V AC
- Insulation resistance: > 100 MΩ (1000 V DC)
- Maximum operating temperature: +500 °C (800 °C for pulse duty, depending on the alloy used)
- Material type: AISI 304
- Connection: Directly on the resistor terminals
- Cable entry: Through flanges on the closed IP20 base
- Standard protection rating: IP20 to IP23
OPTIONAL
- Bulb thermostat fitting.
- Fixed intermediate taps available.
- Non-standard tolerance on the cold resistance value.
- Powder-coated enclosure, available in different RAL colours on request.
- Coating specification up to C5-VH.
- Stainless steel enclosure.
- Higher IP rating, up to IP55 (in this case the enclosure is custom-designed and dimensions differ from the standard ones indicated) (subject to the operating duty cycle).
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