F-ATI and F-ARI are RCCBs with an automatic uninterruptible test function. Depending on the application, RCCBs should be tested at least every six months. This ensures that the contacts are functioning properly and that the device is tripped in the event of a fault current to earth. Regular testing of RCCBs affects the uninterrupted operation of the downstream circuits and is associated with a great deal of work. When using F-ATI and F-ARI, this work is eliminated. These FIs carry out the regular tests automatically and without interrupting the system. Operation by maintenance personnel can therefore be reduced to a minimum. In addition to the automatic tests, the F-ARI series is equipped with an automatic reclosing unit to close the RCCB again after it has been tripped. This is specifically designed for areas to which only electrically trained persons or qualified electricians have access. Restart is based on an insulation test to ensure that it is not a permanent fault. The results of all circuits are also collected via the ARBus interface.
| Property | Value |
| Rated current: | 25 A |
| Number of poles: | 4 |
| Rated residual current: | 0.3 A |
| Width in modular spacing: | 7 |
| Short-time delayed type: | yes |
| Size (according to DIN 43880): | 7 |
| Protection class (IP): | IP20 |
| Additional devices integrated: | Self-test, automatic restart and auxiliary switch |
| Mounting type: | DIN rail |
| Rated switching current of additional device: | 0.1 A |
| Fault current type: | A |
| Rated voltage: | 400 V |
| Installation depth: | 80 mm |
| Rated voltage of additional device: | 230 V |
| Frequency: | 50 Hz |
| Control voltage type of additional device: | AC/DC |
| Selective type: | no |
