Product Details

ABB pfsk151 3bse018876r1 card module inventory

Consider a circuit-breaker type XT2 160 In 160 and, using the trimmer for

the thermal regulation, select the current threshold, for example at 144 A; the

magnetic trip threshold, fixed at 10xln, is equal to 1600 A.

Note that, according to the conditions under which the overload occurs, that

is either with the circuit-breaker at full working temperature or not, the trip of

the thermal release varies considerably. For example, for an overload current

of 600 A, the trip time is between 6 and 30 s for hot trip, and between 30 and

100 s for cold trip.

For fault current values higher than 1600 A, the circuit-breaker trips instantaneously through magnetic protection.

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In the following pages the protection functions of the electronic releases for both moulded-case as well as air circuit breakers are reported; as regards the availability of the protection functions with the different releases, reference shall be made to the table on page 43. The examples shown in these pages show how it is possible to set the electronic release by means of the dip-switch on the front of the circuit-breaker; this operation can be carried out also through the controls viewing the LED display (for the releases PR122-PR123-PR332-PR333) or electronically through the test unit PR 010T or with SD-TESTBUS 2. To simplify the reading of the examples, the tolerance of the protection functions has not been considered. For a correct setting it is necessary to take into consideration the tolerances relevant to the different protection functions referred to the electronic trip unit used; for this information please consult the technical catalogue.

The application field of this protection function refers to all the installations which can be subject to overloads - usually of low value but of long duration - which are dangerous for the life of apparatus and cables. These currents usually occur in a sound circuit, where the line results to be overloaded (this event is more likely than a real fault). The trip curve of this protection (which cannot be excluded) is defined by a current threshold I1 and by a trip time t1. More exactly : • I1 represents the current value beyond which the protection function commands the opening of the circuit-breaker according to an inverse time trip characteristic, where the time-current connection is given by the relation I 2 t = constant (constant specific let-through energy); • t1 represents the trip time of the protection, in seconds, corresponding to a well defined multiple of I1 and it is used to identify a defined curve among those made available by the trip unit