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ACCESSOR I ES
RC B Type residual current releases (type B) for XT3
Current setting
Power-on LED
Test push-button
LED signaling alarm and pre-alarm
Setting fault frequencies
Magnetic indicator of residual current device trip
Setting non-tripping times
The RC residual current release type B, to be used in conjunction with the XT3 circuit-breaker, has the fol- lowing features: • it complies with type B operation, which guarantees sensitivity to residual fault currents with alternat- ing, pulsating alternating and direct current components (in compliance with the Standards 60947-1, IEC 60947-2 Annex B, IEC/TR 60755); • the maximum frequency band of the residual fault current detection can be selected (3 steps: 400 - 700 - 1000Hz). The residual current device can therefore be adapted to suit various industrial installation re- quirements according to the prospective fault frequencies generated on the load side of the release. Typical installations that may require different frequency thresholds from the standard ones (50 - 60Hz) include welding systems for the automobile industry (1000Hz), the textile industry (700Hz), airports and three-phase drives (400Hz).
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