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MFZRN25-12-Load-Switch

Load Switch MFZRN25-12

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Description

 

The load switch MFZRN25-12 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

 

Operating Conditions of MFZRN25-12:

  1. Altitude: up to 1000 m.
  2. Ambient temperature: from -35°C to + 45 ° C.
  3. Environmental Humidity: the average value of relative humidity during the day is not more than 95%;
  4. Seismic resistance up to 8 points.
  5. Do not operate in places where the circuit breaker may be exposed to flammable gas, where there is a danger of explosion, the risk of chemical corrosion, and where the equipment is subject to strong vibration.
  6. Estimated service life — 20 years
  7. Warranty Period — 12 months

 

Parameters of FZRN2 5-12

Name Parameter MFZN25-12 MFZRN25-12
Rated voltage kV 12 12
Rated frequency Hz 50 50
Rated current A 630 125
Power frequency withstand voltage, 1 min kV Vacuum breakdown phase-earth 42 Insulation gap 48
Lightning impulse withstand voltage (peak) kV Vacuum breakdown phase earth 75 Insulation gap 85
Withstanding Peak Current kA 50 —
Short-time withstand current (4s) kA 20 —
Short-circuit breaking current kA — 31,5
Fuse model SDLAJ-12, SFLAJ-12, SKLAJ-12
Rated short-circuit current kA 50 80 (estimated peak value)
Auxiliary voltage rating (AC or DC) IN 220; 110 220; 110
Mechanical abrasion resistance cycle 10000 10000
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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.

 

Overall Dimensions of MZRN25-12

MFZRN25-12-1

MFZRN25-12-2

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