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RV Varistors
A metal oxide varistor (MOV) is a voltage dependent resistor with a symmetrical V/I characteristics curve whose resistance decreases with increasing voltage.
Varistors are ideally suited for protecting sensitive electronic circuits and components (power semiconductors) against voltage transients caused either by the mains or by other application parts.
Connected in parallel with the electronic device that is to be guarded, they form a low resistance shunt when voltage increases and thus prevent any further V/I in the over voltage.
Type Selection
3-phase mains without neutral
| Mains | Uc | Type No. | Epcos | AVX | Nippon Chemi-Con | ACPA/ Song Long |
| 230 V | 710 | RV 02 | SIOV-S20K275 | VF20M10431K | TND 20V-431 | 431KD20 |
| 400 V | 1120 | RV 04 | SIOV-S20K420 | VF20M10681K | TND 20V-681 | 681KD20 |
| 480 V | 1355 | RV 05 | SIOV-S20K510 | VF20M10821K | TND 20V-821 | 821KD20 |
| 600 V | 1650 | RV 06 | SIOV-S20K635 | VF20M10102K | TND20V-102 | 102KD20 |
| 660 V | 1815 | RV 07 | SIOV-S20K680 | - | TND20V-112 | 112KD20 |
| 120/240 | 710 | RV 02 | SIOV-S20K275 | VF20M10431K | TND 20V-431 | 431KD20 |
| 230/400 | 710 | RV 02 | SIOV-S20K275 | VF20M10431K | TND 20V-431 | 631KD20 |
| 400/690 | 1120 | RV 04 | SIOV-S20K420 | VF20M10681K | TND 20V-681 | 681KD20 |
