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RELAY voltage monitoring (Finder 70.41) 250-400VAC, 6-10A

https://unicat.msf.org/cat/product/72718
NST PELECOMMRFM6T

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RELAY voltage monitoring (Finder 70.41) 250-400VAC, 6-10A

Form

Three-phase voltage monitoring relay designed to supervise voltage quality and phase conditions in three-phase electrical systems.

  • nominal system voltage: 380–415 VAC
  • frequency: 50/60 Hz
  • monitoring voltage range: 300–480 VAC
  • monitoring functions: overvoltage, undervoltage, window mode, phase loss, phase rotation, voltage asymmetry, neutral loss (selectable)
  • asymmetry threshold: adjustable 4–25 % of UN
  • rated insulation category: overvoltage category III
  • IP protection: IP20
  • operating temperature: −20 °C to +60 °C
  • standards compliance: IEC / EN 60255, IEC / EN 61810
  • module width: 35 m
  • weight: 0.13 kg​

Per piece.

Fit

Supply connection: three-phase voltage sensing via L1, L2, L3, with optional neutral
Output interface: 1 changeover relay contact (SPDT, 1 CO)
Rated output current: 6 A (control circuits)
Peak switching current: 10 A
Contact material: AgNi
Output behavior:

  • contact closes when monitored voltage and phase parameters are within set limits

  • contact opens on detection of undervoltage, overvoltage, phase loss, incorrect phase rotation, voltage asymmetry, or neutral loss

Electrical integration: designed to interface with contactor coils, alarms, or control inputs
Mounting interface: 35 mm DIN rail
Terminal type: screw terminals
Installation environment: electrical panels and control cabinets

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Function

Primary function:

  • continuous monitoring of three-phase voltage quality and phase integrity

Functional behavior and limitations:

  • detects abnormal voltage and phase conditions in three-phase networks
  • provides automatic recovery when voltage conditions return within acceptable limits
  • intended for monitoring and control functions only
  • not designed for direct power switching of loads

Typical applications:

  • motor protection via control circuits
  • pumps and ventilation systems
  • hoists, cranes, and elevators
  • industrial and infrastructure control panels
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