BACK-UP PROTECTION BY H.R.C. FUSES
For applications in which fault currents larger than the contactor's breaking capacity, or with peak values higher than those which cause the repulsion of the contacts are experienced, protection is entrusted to H.R.C. fuses that do not operate with currents within a limit which the contactor can withstand but that, on the contrary, with higher currents grant the full protection or a limited damage of the contactor itself. The table below shows for the different types of contactor the corresponding size of fuses recommended to obtain respectively the full protection or a damage limited to the contacts' welding.
(Table n. 6)
| Contactor Type N | 85 | 125 | 190 | 270 | 350 | 550 | 650 | 800 | 1000 | 1250 | |
| Max.Fuse | c | 100 | 125 | 160 | 225 | 250 | 355 | 425 | 500 | 630 | 1000 |
| Rating [Amps.] |
b | 125 | 160 | 200 | 300 | 355 | 500 | 630 | 800 | 1000 | 1200 |
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Electrical Characteristics | Overall Dimensions | Contactors type TAN | Contactors type TDN Contactors type TADN | Contactors type NF, NFS | Contactors type CN |