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Test Terminal Blocks

Care must be taken that the secondary of a current transformer is not disconnected from its load while current is in the primary, as the transformer secondary will attempt to continue driving current across the effectively infinite impedance up to its core saturation voltage. This may produce a high voltage across the open secondary into the range of several kilovolts, causing arcing, compromising operator and equipment safety, or permanently affecting the accuracy of the transformer.

To avoid personal injury or equipment damage, the secondary must always be short-circuited or connected to a burden.

The solution to this problem is to installation of a Test Terminal Block (TTB) that allows for safe testing, disconnection of the equipment leaving CT’s securly short-circuited.

Using our test/disconnect terminals also reduces possibility of damage to Current Transformers.

Test Terminal Blocks (TTB's) can be used for testing a wide range of electrical equipment including integrating meters and protective relays, without disturbing the normal load circuit. Terminal arrangements can be adapted by us to suit many other applications.

  • Front and back connected types.
  • All terminals and screws are plated brass.
  • Molded insulation barriers between sets of terminals.
  • Link facilities for testing purposes.
  • Fully complies with BS EN 60947-7-1:2002 (Low voltage switchgear and controlgear)
  • Part 7 -1 ancillary equipment - terminal blocks for copper conductors and insulators.
  • Working Voltage 415VAC DC
  • Rated insulation voltage 2.5kV.
  • Rated impulse withstand voltage 6kV.
  • Rated cross section 16mm2.
  • Rated connecting capacity (mm2) 6, 10, 16.

14 Item(s)

List  Grid 

  1. DIN Rail CT Installation Block

    DIN Rail CT Installation Block

    CT Operated Meter Installation Block Including clear wiring legends, spare fuse in each carrier, neutral disconnect, 4mm test terminals & CT shorting links. IEEE Standard Requirements for Instrument Transformers C57.13, 17th edition. Learn More
    £46.00
  2. Insulated Boots for Test Terminal Blocks, CTs etc (Type 2)
  3. CB812 Cable Conversion Terminal Block

    CB812 Cable Conversion Terminal Block

    The CB812 Cable Conversion Block is specifically designed for reducing cable conductor size of 12mm to 8mm cable conductor size.

    Developed by Owen Brothers to enable UK uttlities to replace 160A direct connected three phase meter installations without need to change conductors.

    Learn More
  4. Type 22985 Back Connected Test Terminal Block (clear polycarbonate  Front cover. 11 – 32mm and 2 – 60mm studs.)

    Type 22985 Back Connected Test Terminal Block (clear polycarbonate Front cover. 11 – 32mm and 2 – 60mm studs.)

    Type 22985 – Drw 4735A – Standard back connected with clear polycarbonate Front cover. 11 – 32mm and 2 – 60mm studs. Terminal Test Blocks can be used for testing a wide range of electrical equipment including intergrating meters and protective relays, without disturbing the normal load circuit. Terminal arrangements can be adapted to suit many applications eatures Terminal arrangements cover a wide range of applications Front and back connected types All terminals and screws are plated brass Moulded insulation barriers between sets of terminals Link facilities for testing purposes Learn More
  5. Type 22989 Front Connected Test Terminal Block (extended clear polycarbonate front cover)

    Type 22989 Front Connected Test Terminal Block (extended clear polycarbonate front cover)

    Type 22989 – Drw. 4731B – Standard front connected with extended clear polycarbonate front cover. Terminal Test Blocks can be used for testing a wide range of electrical equipment including intergrating meters and protective relays, without disturbing the normal load circuit. Terminal arrangements can be adapted to suit many applications eatures Terminal arrangements cover a wide range of applications Front and back connected types All terminals and screws are plated brass Moulded insulation barriers between sets of terminals Link facilities for testing purposes IEEE Standard Requirements for Instrument Transformers C57.13, 17th edition. Learn More
  6. Type 22983 Front Connected Test Terminal Block

    Type 22983 Front Connected Test Terminal Block

    Type 22983 – Drw.4731A – Standard front connected test terminal block with Standard clear polycarbonate front cover. Learn More
  7. Type 22979 12 Way Front Connected Test Terminal Block

    Type 22979 12 Way Front Connected Test Terminal Block

    Type 22979 - Front connected 12 way, 3 sets of 4 current terminals with 3 rotary links per set. With insulated fences between the sets. Clear polycarbonate standard cover. Learn More
  8. Type 22990 Front Connected Test Terminal Block

    Type 22990 Front Connected Test Terminal Block

    Type 22990 Front connected test terminal blocks which have vertical sliding disconnect links on the voltage and neutral terminals with insulated barriers between each voltage terminals and neutral terminals, with rotary links on the three sets of 3 current terminals with 2 links per set, which give a good visible indication of disconnections. With clear polycarbonate front covers. IEEE Standard Requirements for Instrument Transformers C57.13, 17th edition. Learn More
  9. Test Terminal Block Type 22995A
  10. Test Terminal Block 22984 Back Connected

    Test Terminal Block 22984 Back Connected

    Back Connected Test Terminal Block Type 22984 IEEE Standard Requirements for Instrument Transformers C57.13, 17th edition. Drawing Number 4735 Learn More
  11. Insulated Boots for Test Terminal Blocks, CTs etc
  12. Rear Safety Cover

    Rear Safety Cover

    PROTECTION AROUND REAR CONNECTIONS OF A TEST TERMINAL BLOCK REAR SAFETY COVER stock no 23009 dwg no 4569 For use with a back connected test terminal block dwg 4735 stock no 22984 Available for fitting behind the panel to shield the rear electrical connections from operator contact. Learn More
  13. Test Terminal Block Type 22988 Front Connected

    Test Terminal Block Type 22988 Front Connected

    Terminal Test Blocks can be used for testing a wide range of electrical equipment including intergrating meters and protective relays, without disturbing the normal load circuit. Terminal arrangements can be adapted to suit many applications eatures Terminal arrangements cover a wide range of applications Front and back connected types All terminals and screws are plated brass Moulded insulation barriers between sets of terminals Link facilities for testing purposes TEST TERMINAL BLOCKS c/w 4mm safety test sockets Front connected type with: standard black cover ; stock no 22988 dwg no 4731 IEEE Standard Requirements for Instrument Transformers C57.13, 17th edition. Learn More
    £45.00
  14. Test Terminal Block 22980 Back Connected

    Test Terminal Block 22980 Back Connected

    Back Connected Test Terminal Block Type 22980 Learn More

14 Item(s)

List  Grid