CTT0318 Toroidal Current Transformer, High Voltage

Model Rated Current (Ampere) Maximum Current (Ampere) Opening (mm/in) CTT0318-0070A/ 0.333V 70A 520A 31.8/ 1.25 CTT0318-00100A/ 0.333V 100A 520A 31.8/ 1.25 CTT0318-00150A/ 0.333V 150A 520A 31.8/ 1.25 CTT0318-00200A/ 0.333V 200A 520A 31.8/ 1.25 CTT0318-00250A/ 0.333V 250A 520A 31.8/ 1.25 CTT0318-00300A/ 0.333V 300A 520A 31.8/ 1.25 CTT0318-00400A/ 0.333V 400A 520A 31.8/ 1.25 Specifications:>Toroidal Current Transformer
  • Input Frequency: 50/ 60HZ
  • Maximum Primary Voltage: 5,000 Vac (Insulated Conductor)
  • Secondary Output: 0.333V @ rated current
  • Accuracy: ±1% from 10% to 130% of rated current
  • Phase Angle: less than 1 degrees at 50% of rated current
  • Insulation Voltage: 600 Vac
  • Operating temperature: -15ºC to +60ºC
  • Construction:
    • Epoxy encapsulated with case housing (ABS Resin UL flame retardant rating 94V-O) or
    • Polyster tape covering.
  • Leads: 0.61m (2 ft.), UL 1015 twisted pair, 0.34mm (22AWG)
  • RoHS Compliant
Physical Specifications:
Dimension mm (in)
A B C D F G Mounting slot
91.4 (3.60) 30.0 (1.18) 74.9 (2.95) 35.0 (1.38) 78.7 (3.10) 68.6 (2.70) 6.3 (0.25)
Standard Sizes
  • CTT0076 standard models – 7.6mm (0.30in) window
  • CTT0127 standard models – 12.7mm (0.50in) window
  • CTT0150 standard models – 15.0mm (0.59in) window
  • CTT0191 standard models – 19.1mm (0.75in) window
  • CTT0254 standard models – 25.4mm (1.00in) window
  • CTT0318 standard models – 31.8mm (1.25in) window
  • CTT0350 standard models – 35.0mm (1.37in) window
  • CTT0508 standard models – 50.8mm (2.00in) window



Many of our products can be designed and manufactured to meet the specific application requirements. For a no obligation technical evaluation, please provide the specific performance requirements to engineering@tichenassociates.com.