Series 173,
20/30mm Busbars



A range of compact low cost moulded case current transformers suitable for primary currents from 40A to 750A with built in sealable terminal covers.


For transforming various primary currents into 5A or 1A standard secondary using up to 30x15mm or 20x20mm busbars or cables up to 24mm diameter.



  • Built in sealable terminal covers.
  • Mounting feet supplied.
  • Narrow width – 70mm.
  • Wide range of primary current

Technical Specification

  • Conforms to IEC185, BS 7626, BSEN 60044-1,
    IEC 60044-1 and IEC 61869-2.
  • Rated system voltage 0.72/3kV.
  • Ambient temperature range -5°C to +50°C.
  • Continuous current 1.2 x rated current.


Class 1 Class 0.5 Class 0.55
VA 2.5 5 10 15 2.5 5 10 15 2.5 5 10 15
40/5 A1
50/5 B1
60/5 C1
80/5 D1 D9
100/5 E1 E5 E9
150/5 F1 F2 F5 F6 F9 F10
200/5 G1 G2 G3 G5 G6 G9 G10
300/5 H1 H2 H3 H4 H5 H6 H7 H9 H10
400/5 J1 J2 J3 J4 J5 J6 J7 K9 K10
600/5 K1 K2 K3 K4 K5 K6 K7 K9 K10 K11
750/5 L1 L2 L3 L4 L5 L6 L7 L9 L10 L11

1A secondary available by request. Class 0.2, 0.2S available by request.

Order Example: A 17 series Type 173 moulded case current transformer
with 5A secondary and 600A primary 5VA class 0.5 is
part number 175-5-K6