SIRIUS 3RF34 solid-state switching devices
3.5 Planning/configuring
SIRIUS Innovations
336 System Manual, 01/2011, A8E56203870002-03
3.5.3.2 Mounting accessories for the load feeder conforming to UL
SCCR short-circuit current ratings
SCCR short-circuit current ratings
● The SCCR (Short Circuit Current Rating) indicates the maximum permissible short-circuit
current for a switching device. A higher value can only be achieved in combination with
protection devices such as fuses or circuit breakers.
● This rating is required for mounting accessories in control cabinets conforming to
UL 508A. The switching device or switchgear assembly with the lowest value specifies
the value for the entire control cabinet.
A low value makes engineering the supply voltage for the control cabinet difficult.
● 3RF3 solid-state switching devices have a standard short-circuit value of 5 kA conforming
to UL 508.
● Tests with a short-circuit value of 65 kA (High Capacity Short Circuit Current Ratings)
have also been carried out. The UL reports include details of possible combinations with
Class CC and Class J fuses, as well as with a number of circuit breakers.
Fuses
Fuse ratings for solid-state contactors
Table 3- 12 Fuses for protecting against high short-circuit currents
Fuses
3RF34 Max. size [A] Class Type Current [kA] Voltage [V]
3RF3405-.BB 25 J TD 65 480
3RF3405-.BB 45 J TD 65 600
3RF3410-.BB 45 J TD 65 480
3RF3410-.BB 45 J TD 65 600
3RF3412-.BB 45 J TD 65 480
3RF3412-.BB 50 J TD 65 600
3RF3416-.BB 50 J TD 65 480
3RF3416-.BB 50 J TD 65 600
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