Hi newsgroup,
I have a problem with a varistor selection.
I have a coil with DC current supply that is used inside a steel piece as an electromagnet. The varistor is inside a rectifier that gives the power to the coil and I don't know for sure if the varistor is suitable for the application.
The coil is at 110 Vdc and 2,2 A with 2500 turns and 0,9 mm diameter and I don't know the inductance as I don't have the B-h curve of the steel.
The varistor datasheet is as follows: Varistor voltage: 820 V Max. work voltage: 670 Vdc Energy(10x1000us): 110J Rated power: 0,4W Max. clamping voltage: 1355V and 25 A
I have another rectifier with this other varistor: Varistor voltage: 680 V Max. work voltage: 560 Vdc Energy(10x1000us): 45J Rated power: 0,4W Max. clamping voltage: 1120V and 25 A
I don't know if anyone of these two varistors are suitable and if anyone can help me I would appreciate it.
Thank you
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