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3-in-1 Current Transformers from Crompton Instruments

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article image 3-in-1 Current Transformers

Tyco Electronics introduces the 3-phase, 3-in-1 current transformers under its Crompton Instruments brand.  

The M3N1 range of Crompton Instruments 3-in-1 current transformers offers primary currents between 60-630A with 5A secondaries offering up to class 0.5 accuracy performance.  

M3N1 3-in-1 current transformers are space-saving devices that can be directly installed next to a 3-phase moulded case circuit breaker where individual current transformers may not fit in between busbars.  

M3N1 3-phase current transformers also save on installation time, eliminating the need to fit three standard individual current transformers.  

Features of 3-in-1 current transformers

  • Cost effective 3-phase moulded case
  • Ratios range from 60/5 to 630/5
  • Integrated wire sealable terminal cover
  • Busbar, DIN-rail and metal feet mounting hardware supplied
  • Combined M4 posi/slot screw


  • System voltage: 720V maximum
  • Test voltage: 3kV for 1 minute
  • System frequency: 50Hz or 60Hz
  • Primary ratings: 60A to 630A
  • Rated dynamic current: 2.55 x lht
  • Secondary terminals: M4 screw terminals
  • Enclosure: Flame retardant grade classified UL 94V-O
  • Operating temperature: -20°C to +85°C
  • Accuracy Class 0.5, 1, 3
  • Mounting hardware: Plug-in metal feet for wall or base mounting
  • Busbar and DIN-rail mounting
  • Compliant with IEC/EN 60044-1

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