FANUC A06B-6079-H208 Multi-function I/O card

FANUC A06B-6079-H208 Multi-function I/O card

In some applications of high impedance relays, a non-linear Metrosil resistor is required to limit the current transformer (CT) secondary voltage to a safe level during fault conditions. M&I Materials Ltd supply a wide variety of Metrosils to provide such protection. This datasheet will help you specify the correct Metrosil device for your relay.

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Maximum Secondary Internal Fault Current 

This is the highest possible current on the secondary that occurs during a fault on the primary. This can be determined from the primary fault current and the CT ratio, and is typically less than 150 Arms.During a fault, the Metrosil will automatically limit any overvoltage. Typically this is between 1 – 3.5 kVpeak under clamping conditions.

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