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SSR's
20-25A SSR's are about $15 new (you can pick them up used or in surplus shops for about $10)
Image | Voltage out (max) | Voltage in | Current max | Distributor |
| | | 20 Amp | Mouser |
| 250VAC | 4-32VDC | 25 Amp | Digikey |
| 480VAC | 3-32VDC | 25 Amp | Auber |