Page 175 of Current Catalog by Moeller Electric USA

04/010 electronic overload relays description zev ­ the revolutionary electronic overload relay for motor currents from 1­820 a thermal overload relays thermistor tripping units technological advances require completely new approaches the application of newly developed sensor systems and tripping units has made motor protection considerably simpler and more economical all z overload relays provide the standard functions protection in the event of phase failure overload or current imbalance the innovative zev motor-protective system from moeller can now do all these things and much more severe starting conditions even the most severe starting situations can be dealt with by the zev motorprotective system the enhanced tripping classes up to class 40 provide reliable protection for motors with starting times of up to 40 seconds protection for any motor starting situation can be optimally set by preselecting one of the eight tripping classes between 5 and 40 a ground fault is quickly detected by the external core-balance transformers the integrated thermistor connection allows the relay to be upgraded to provide a full motor-protective system simple and safe to operate the lcd display guides the user through the setting menus and ensures straightforward operation in the event of a fault the display shows the origin of the fault and enables rapid fault identification additional signals can be implemented via the freely configurable auxiliary contacts 05-06 and 07-08 they can each be assigned one of the following functions · early warning of overload · ground-fault · thermistor tripping · internal fault simple engineering the multi-voltage module automatically adapts to different voltages from 24 ­ 240 v 50/60 hz and 24 ­ 240 v dc thus enabling flexible application with all conventional control voltages simple and space-saving mounting ring-type sensors enable the innovative zev overload relays to be used even for small motors with high motor currents and large cable sizes the sensor cables are simply laid around the supply cables there is no need for main circuit wiring with complex cable matching to another unit nor for drilling a mounting plate instead the sensor is simply affixed using a velcro fastening saving installation time and expense the volume of the transformer is reduced by up to 58 times in comparison with conventional transformers saving valuable space in the control panel.

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