Quote:
Originally Posted by JasonG
I have fallen in love with IGBTs.
Built in zener diode for protection.
IGBT 30A 600V D2PAK - STGB20NC60V
Just make sure to drive it fully on and off with pull up/down resistors.
For motors, they have a low gate voltage and consumption. A 555 will drive them continuously ! |
Thank you! We may have a winner.
They are cheap enough I can put a current limiter on each of the four wires. A simple latch-up if the current exceeds 30 A will solve the problem. Add recessed, push button reset and LED indicator and we're good to go. In fact, the same reset switch can also work as an ON/OFF switch. Best of all, I don't have the replacement safety issue and potential costs of blown fuses. My only concern is whether they are unidirectional and I may have to diode protect and double them.
The other possibility are some of the high voltage, solar array fuses. I found one rated at 30 A., 600 V. for $7.00 each. If I add a 'fuse change' switch, this could also work. The fuse is naturally bi-directional. But I can't use the fuse change switch because interrupting 29 A will still draw an arc and eat the switch contacts. I still need a power, DC switch.
Bob Wilson