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MFZRN21-12-Load-Switch

Load Switch MFZRN21-12

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Description

 

The load switch MFZRN21-12 is a three-phase combined load switch with fuses, which enables switching on and off under load (without damage) sections of the three-phase alternating current circuit, with earthed or isolated neutral, in emergency conditions.

Rated current, A — 125, 400, 630

Rated voltage, kV — 10

The maximum operating voltage, kV — 12

Rated frequency, Hz — 50

Rated short-time withstand current, kA / s — 12.5 / 4 20/2

Rated peak withstand current, kA — 31.5 / 50

Impulse voltage (peak) / ground, kV — 75/85

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Parameters

 

The load switch MFZRN21-12 is a three-phase combined load switch with fuses, which enables switching on and off under load (without damage) sections of the three-phase alternating current circuit, with earthed or isolated neutral, in emergency conditions.

Rated current, A — 125, 400, 630

Rated voltage, kV — 10

The maximum operating voltage, kV — 12

Rated frequency, Hz — 50

Rated short-time withstand current, kA / s — 12.5 / 4 20/2

Rated peak withstand current, kA — 31.5 / 50

Impulse voltage (peak) / ground, kV — 75/85

Parameters of MFZRN21-12

NameParameterMFZN21-12 MFZRN21-12
Rated voltagekV1212
Rated frequencyHz5050
Rated currentA630125
Power frequency withstand voltage, 1 minkVVacuum breakdown phase-earth 42Insulation gap 48
Lightning impulse withstand voltage (peak)kVVacuum breakdown phase earth 75Insulation gap 85
Withstanding Peak CurrentkA50—
Short-time withstand current (4s)kA20—
Short-circuit breaking currentkA—31,5
Fuse modelSDLAJ-12, SFLAJ-12, SKLAJ-12
Rated short-circuit currentkA5080 (estimated peak value)
Auxiliary voltage rating (AC or DC)IN220; 110220; 110
Mechanical abrasion resistancecycle1000010000

 

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Solutions

 

Solutions and Applications of High-Voltage Load Switches:

  1. Power Distribution: load switches are widely used in medium to high voltage power distribution systems to safely disconnect sections of the electrical grid during both normal and fault conditions.
  2. Transformer Substations: In substations, these switches protect transformers by disconnecting them during overload conditions or for routine maintenance.
  3. Ring Main Units (RMUs): Common in urban power grids, RMUs use load switches to ensure continuity of supply and protection against faults.
  4. Industrial Plants: In heavy industries, where electrical loads are significant, these switches help manage and protect large motors, generators, and transformers.
  5. Wind and Solar Farms: Renewable energy generation systems require reliable switches to protect and manage their connections to the grid. SF6 load switches fit the bill due to their reliability and efficiency.
  6. Rail Systems and Infrastructure: For electrified rail systems, SF6 switches help manage and protect the overhead catenary systems and ensure safe and efficient operations.
  7. Mining Operations: The demanding conditions of mining environments make the ruggedness and reliability of SF6 switches invaluable for ensuring electrical system safety.
  8. Capacitor Bank Switching: In power compensation systems, SF6 load switches assist in the safe and efficient switching of capacitor banks, ensuring power quality and system stability.

 Overall Dimensions of MFZRN21-12

MFZRN21

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