Class 1 ... / 5 A

Moulded case current transformers

  • Versatility & increased safety

  • Moulded case current transformers are used if high currents are to be recorded and further processed. The line to be measured (conductor rail or wire) is fed through the window opening and forms the primary circuit for the plug-on current transformer.

    Moulded case current transformers are predominantly used for mounting on conductor rails. Through additional potting it is possible to achieve droplet-tightness, as well as greater shock and vibration resistance with mechanical loading (IEC 68). This is the most common and cost-effective form of current transformer.

    However, the primary conductor must be disconnected during installation. This form of transformer is therefore most commonly used in new system installations.

  • General properties, type ASK

    • Unbreakable plastic housing
    • Polycarbonate black
    • Flame retardant
    • Self-extinguishing
    • Transformer housing ultrasonically welded
    • Nickel-plated secondary terminals with plus/minus M 5 x 8 mm screw, tightening torque max. 2 Nm
    • Integrated secondary closure flap
    • Connection cross section: max 4 mm2 with wire end ferrule, 6 mm2 solid
  • General properties, type CTB

    • UL certified
    • World's first current transformer with screwless connection technology – spring-loaded terminal block
    • Innovative, time-saving connection option (front or top) for solid and flexible conductors (max. 4 mm2 – wire end ferrules are not necessary)
    • Shock and vibration resistant, high mechanical holding forces
    • Maintenance-free, gas-tight connection
    • High current resistance
    • Therm. rated continuous current Icth: 1.2 x IN
    • Low-voltage current transformer for max. operating voltages up to 1.2 kV; use in 690 V networks possible