The following are large 3 lead MOV’s that include a thermal fuse – this fuse will prevent thermal runaway on short circuit failure mode. The 3 lead arrangement also allows an LED indicator light to notify when failure of the thermal fuse has occurred.
- $4 TMOV25SP115M – 28MM 20KA 170J 115VAC 150VDC – good for 150V DC systems Datasheet
- $4 TMOV25SP150M – 28MM 20KA 220J 150VAC 200VDC – good for 120V AC systems Datasheet
- $4 TMOV25SP300M – 28MM 20KA 370J 300VAC 385VDC – good for 300V AC systems Datasheet
These are smaller standard 20MM MOVs that are much less expensive but do not include the 3 lead arrangement.
- $0.65 V20E60P – 20MM 10KA 100J 60VAC 85VDC Datasheet
- $0.37 MOV-20D101K – 20MM 6.5KA 45J 60VAC 85VDC Datasheet
Another option is gas discharge tube arresters, these may last longer under repeated use than MOVs