Metal Oxide Varistor MOV 7D471K 470V
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Prices updated: 13 Oct 2026
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About this product
The 7D471K is a metal oxide varistor (MOV) used to protect electronic circuits from voltage surges and transients, such as those caused by inductive switching. The listing states a 300 V AC RMS rating, which suits 220 V AC mains line protection in typical electronic devices. The 470 V marking refers to its varistor voltage.
Specifications
- Model
- 7D471K
- Varistor voltage (code 471)
- 470 V
- AC RMS rating
- 300 V
- Lead length
- 2.8 cm
- Lead spacing
- 0.6 cm
Frequently asked questions
Can I use the 7D471K directly across 220 V mains?
The listing rates it at 300 V AC RMS, which covers 220 V AC mains (peak about 311 V). It should be connected across line and neutral, in parallel with the protected circuit. Many designs add a series fuse for safety, because a MOV can fail short when it absorbs large surges.
Why is it marked 470 V if the mains is 220 V?
The 470 V is the varistor voltage, the level at which it starts conducting strongly. Under normal operation the 220 V RMS supply peaks at about 311 V, which stays below that threshold, so the MOV remains idle until a surge occurs. The 300 V AC RMS rating is the figure that matters for mains.
