[Nick]

Maximum Overload Voltage
The maximum value of voltage capable of being applied to resistors for a short period of time in the overload test.
Typically the applied voltage in the short time overload test is 2.5 times larger than the rated voltage. However, it should
not exceed the maximum overload voltage.

Maximum Working Voltage (or Maximum Limiting Element Voltage)
The maximum value of DC voltage or AC voltage (rms) capable of being applied continuously to resistors or element.
However, the maximum value of the applicable voltage is the rated voltage at the critical resistance value or lower.