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Earth leakage circuit beakers in Europe

General

We use SEW Eurodrive frequentie drives in our machines, these frequentie drives cause earth leakage currents. SEW eurodrive recommends that you shouldn’t use earth leakage circuit breakers, however if the customer want/need to use an earth leakage circuit breaker, then SEW Eurodrive recommend a type B earth leakage circuit breaker.

8.1.1 Line protection and earth-leakage circuit breaker

  • Install fuses at the beginning of the mains cable behind supply bus junction (→ Basic unit connection diagram).
  • SEW-EURODRIVE recommends that you do not use earth-leakage circuit breakers. However, if an earth-leakage circuit breaker is stipulated for direct or indirect protection against contact, observe the following note in accordance with EN 61800-5-1:
! WARNING Wrong type of earth-leakage circuit breaker installed. Severe or fatal injuries. MOVITRAC® can cause direct current in the protective earth. In cases where an earth-leakage circuit breaker (FI) is used for protection against direct or indirect contact, only an earth-leakage circuit breaker (FI) of type B on the external power supply side of the MOVITRAC® is permitted.

 

If an earth leakage circuit breaker is used the PE mains connection need to fulfil to the following terms:

 

8.1.2 PE mains connection (→ EN 61800-5-1) Earth-leakage currents ≥ 3.5 mA may occur during normal operation. To meet the requirements of EN 61800-5-1 observe the following:

  • Supply system lead < 10 mm2 (0.016 in2 ): Route a second PE conductor with the cross section of the supply system lead in parallel to the protective earth via separate terminals or use a copper protective earth conductor with a cross section of 10 mm2 (0.016 in2 ).
  • Supply system lead 10 mm2 … 16 mm2 (0.016 in2 … 0.025 in2 ): Route a copper protective earth with the same cross-section as the supply system lead.
  • Supply system lead 16 mm2 … 35 mm2 (0.025 in2 … 0.054 in2 ): Route a copper protective earth with a cross-section of 16 mm2 (0.025 in2 ).
  • Supply system lead > 35 mm2 (0.054 in2 ): Route a copper protective earth with half the crosssection of the supply system lead.
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