HRC 300A 500 Melbourne Handle is used with electrical switches or circuit breakers with High Rupturing Capacity (HRC) ratings, meaning it can safely manage high fault currents. The product is specifically designed to operate with electrical equipment or circuits that require a maximum voltage of 500 volts & maximum current of 300 amps. The HRC 300A 500 Melbourne Handle may be used to manually operate or set up the switch or breaker, or it may feature some other type of safety attribute.