Cornwall-based Arcol Resistors has released a wirewound discharge resistor for large capacitors.
Shaped to screw straight onto the capacitor, there are three power ratings in the RW series: 10W (1-15kΩ), 13W(1-2kΩ) and 22W (1-33kΩ), all with ten times overload or over-voltage for 5 seconds.
Operation is over -55 to +200°C, de-rating 80 to 175°C linearly.
Tolerance is ±1% (code F) or ±5% (J), and temperature coefficient is 30 or 100ppm/°C.
Discharge resistors are routinely connected across large value output capacitors found in electrical and electronic equipment which may store dangerous levels of energy after the equipment has been turned off.
“Providing a safe discharge avoids any hazardous conditions when connecting other equipment or during service or repair,” said Arcol.
A second application is for use as balancing resistors to control voltage across series-connected capacitors.
Arcol designs and manufactures its resistors in Cornwall, and has been business since 1952.
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