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The x-axis shows the symmetrical prospective short-circuit current, while the y-axis shows the specific let-through energy values, expressed in MA2s. 17 MA2s (1170000 A2s). 5 Temperature derating Standard IEC 60947-2 states that the temperature rise limits for circuit-breakers working at rated current must be within the limits given in the following table: Circuit-breakers with thermomagnetic release Table 1 - Temperature rise limits for terminals and accessible parts Description of part* 10 °C Temperature rise limits K 80 25 35 - Terminal for external connections - Manual operating metallic means: non metallic - Parts intended to be touched but not metallic 40 hand-held: non metallic 50 - Parts which need not be touched for metallic 50 normal operation: non metallic 60 * No value is specified for parts other than those listed but no damage should be caused to adjacent parts of insulating materials.

Switch disconnectors are often used as: • main sub-switchboard devices; • switching and disconnecting devices for lines, busbars or load units; • bus-tie. Rated operational voltage Ue [V] Altitude 2000[m] 3000[m] 4000[m] 5000[m] Tmax* 690 600 500 440 Emax 690 600 500 440 Rated uninterrupted current Iu [A] 2000[m] 3000[m] 4000[m] 5000[m] Tmax Altitude 100% 98% 93% 90% Emax 100% 98% 93% 90% *Excluding Tmax T1P 90 The switch disconnector shall ensure that the whole plant or part of it is not live, safely disconnecting from any electrical supply.

The effect of limitation and the reduced trip times influence the value of the specific let-through energy. For those current values for which the tripping of the circuit-breaker is regulated by the timing of the release, the value of the specific let-through energy is obtained by multiplying the square of the effective fault current by the time required for the protection device to trip; in other cases the value of the specific let-through energy may be obtained from the following diagrams. The following is an example of the reading from a diagram of the specific letthrough energy curve for a circuit-breaker type T3S 250 In160 at 400 V.

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