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4M400 Test Block System

Test links are an important accessory for protection, metering & control panels. They enable test technicians to quickly & safely isolate protection relays so that test signals may be injected & system performance verified.

The 4M400 Test Block has been designed as a general-purpose isolation & test signal injection point with 14 independent circuits.

The 4M420 Test Plug employs colour coded 'finger safe' 4mm diameter sockets. Either shrouded or standard 4mm banana plugs may be used to connect test equipment for secondary current injection testing.


  • ‘Finger safe’ test sockets suit standard or shrouded type 4mm banana plugs for direct access to the protection or measurement scheme
  • 14 independent test groups may be specified with any combination of circuit types
  • Automatic shorting of CT circuits completed in the test block - No test links or operator intervention required
  • Isolation plug provides sequential circuit isolation timing in three (3) stages
  • Clear and concise front panel circuit identification
  • Test plug fitted with insertion handle and thumb screw retention system to enhance operator safety and system security
  • Concise instructions on test plug for changing from normal service to the test condition
  • High current / voltage rating
  • Made in Australia

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©1998-2012 Relay Monitoring Systems Pty. Ltd.      ACN 052 484 483     ABN 76 052 484 483

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