Series 174,
30/40mm Busbars



A range of compact low cost moulded case current transformers suitable for primary currents from 250A to 1250A with built in sealable terminal covers.


For transforming various primary currents into 5A or 1A standard secondary using up to 40x10mm or 30x30mm busbars or cables up to 30mm 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
250/5 A1 A2 A5 A6 A9
300/5 B1 B2 B5 B6 B9 B10
400/5 C1 C2 C3 C5 C6 C7 C9 C10
500/5 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
600/5 E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11
740/5 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11
800/5 G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11
1000/5 H1 H2 H3 H4 H5 H6 H7 H8 N9 H10 H11 H12
1200/5 J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12
1250/5 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12

1A secondary available by request. Class 0.5S, 0.2, 0.2S by request.

Order Example: A 17 series Type 174 moulded case current transformer
with 5A secondary and 800A primary 5VA class 1 is part number 174-5-G6