A 1688 Universal connection box


Diversity of electronic products, which need to be tested, present many challenges for the manufacturers. Different sizes, shapes and configurations of electronic devices make it challenging for electrical safety examination. Due to these facts Metrel has developed different types of connection boxes, which can be easily adopted to customer’s needs. The A 1688 connection box is a passive device that acts as a connection interface between the CE SWITCH 5 kV and the tested equipment. It is intended for connection of various 1- and 3-phase appliances to A 1600 CE SWITCH 5 kV. Equipment with intended for fixed installation and electronic subassemblies can be tested. Connections for connection to isolated conductive parts and earthed parts are added. The connection box is coded in order to prevent from applying a too high test voltage to its outputs.

Standards applied

Electrical switchboards safety

  • ESB Competences: Electrical Switchboards Safety Testing
  • IEC/EN 61439-1 Low-voltage switchgear and controlgear assemblies - Part 1: General rules

Machine safety

  • MST Competences: Machines Electrical Safety Testing
  • IEC/EN 50191 Erection and operation of electrical test equipment
  • IEC/EN 60950 Information technology equipment – Safety

Portable appliances safety

  • PAT Competences: Portable Appliances Safety Testing
  • EN 50699 Recurrent Test of Electrical Equipment
  • EN 50678 General procedure for verifying the effectiveness of the protective measures of electrical equipment after repair
  • IEC/EN 60335-1 Household and similar electrical appliances - Safety
  • IEC/EN 60598-1 Luminaires - Part 1: General requirements and tests
  • VDE 0701 Inspection after repair, modification of electrical appliances - periodic
  • VDE 0702 Inspection on electrical appliances - general requirements for electrical safety

Instrument safety towards user

  • Directive EMC 89/336/EE on electromagnetic compatibility
  • IEC/EN 61010-031 Amendment 1 - Safety requirements for electrical equipment for measurement, control and laboratory use - Part 031: Safety requirements for hand-held and hand-manipulated probe assemblies for electrical test and measurement


Key features

  • Separate 4 Channels for High Voltage testing up to 5.1 kV AC, 6 kV DC ;
  • Separate 2 Channels for 4-Wire Earth continuity testing up to 25 A;
  • Terminals for connection of remote tip commander (for execution of Earth continuity test);
  • Quick release terminals for connection of devices without plugs;
  • Robust and durable construction;
  • Ready for integration into different test cages.

Optional accessories


Datasheet Language Version Release Notes Type Size Download
A 1688 Universal connection box en 2021 28.09.2021 pdf 1.26 MB
Manual Language Version Release Notes Type Size Download
A 1626 / A 1627 / A 1688 Connection box en 2.1.1 19.05.2021 20 753 084 pdf 1.48 MB Login

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