| Fuse Technology
Co-ordination for motorstarters. To provide adequate short circuit protection for a contactor and or a starter, a protective device is used. According to IEC 60947-4 two types of co-ordination are permissible, 1 or 2, for which the test conditions are given in the aforementioned IEC. Nowadays mainly type 2 is specified. 
To obtain the specified level of protection all combinations of makes and types of protective devices and contactor must be verified by actual short circuit tests. In general this will limit the combination possibilities. By applying fuses the maximum let through energy and cut-off currents are low, resulting in relatively small motor starter combinations at a high prospective short circuit current level. Moreover the make of the fuses concerned is irrelevant because all makes have to comply with IEC 60269, defining the maximum let-through levels. Thus coordination can easily be achieved, by following the applied fuse instructions given by the contactor manufacturer. Applying fuses in motor starter combinations gives you FLEXIBILITY
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