Hi
I have a commercial power supply which was pre-jumpered to 120 volts when I received it. I plugged it into 240 volts without checking. The fusible resistor blew … as it should have. Very pleased.
I searched the iNet and found out that to change from 120v to 240v, I just needed to change an internal jumper. Too late!
The fusible resistor is 6.8 ohms 1.6 watts, ceramic, wire-wound (I think), radial.
So first question. Can anyone direct me to anywhere in the world where I can source a replacement, please
Second question. If I can’t find a direct replacement, what should be the approach to choosing something close?
it strikes me that the fusible resistor is only there to overheat and melt (fuse) when the voltage exceeds the jumpered value. By and large, voltage fluctuations not withstanding, that will only happen when it is set for 120v and you plug it into 240v. So I’m guessing if I’ve corrected the jumper to 240 volts, I cld actually replace the fusible resistor with a dead short at worst, and an ordinary (non-fusible) resistor of 6.8 ohms at best.
I can get a fusible resistor at 6.8 ohms and 1 watt or at 2 watts. 2 watts would risk damage to the power supply by tolerating a higher current before blowing while 1 watt might blow too often/easily.
Would appreciate any advice, please.
Regards
I have a commercial power supply which was pre-jumpered to 120 volts when I received it. I plugged it into 240 volts without checking. The fusible resistor blew … as it should have. Very pleased.
I searched the iNet and found out that to change from 120v to 240v, I just needed to change an internal jumper. Too late!
The fusible resistor is 6.8 ohms 1.6 watts, ceramic, wire-wound (I think), radial.
So first question. Can anyone direct me to anywhere in the world where I can source a replacement, please
Second question. If I can’t find a direct replacement, what should be the approach to choosing something close?
it strikes me that the fusible resistor is only there to overheat and melt (fuse) when the voltage exceeds the jumpered value. By and large, voltage fluctuations not withstanding, that will only happen when it is set for 120v and you plug it into 240v. So I’m guessing if I’ve corrected the jumper to 240 volts, I cld actually replace the fusible resistor with a dead short at worst, and an ordinary (non-fusible) resistor of 6.8 ohms at best.
I can get a fusible resistor at 6.8 ohms and 1 watt or at 2 watts. 2 watts would risk damage to the power supply by tolerating a higher current before blowing while 1 watt might blow too often/easily.
Would appreciate any advice, please.
Regards