Page 203 - SACE Tmax XT - Catalogue

ACCESSORIES 7/57

RC B Type residual current releases (type B) for XT3

Current setting

Power-on LED
Test push-button
LED signaling alarm
and pre-alarm
Magnetic indicator of Setting fault frequencies
residual current device trip

Setting non-tripping times
07
The RC residual current release type B, to be used in conjunction with the XT3 circuit-breaker, has the
following features:
• it complies with type B operation, which guarantees sensitivity to residual fault currents with alter-
nating, 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
requirements 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), air-
ports and three-phase drives (400Hz).