The RS-492 relay-breaker is designed to produce intermittent burning of the parking brake warning lamp. It is suspended on wires behind the instrument cluster.
The number of cycles per minute of turning on and off the relay-breaker at a voltage of 10.8 to 15 V and a temperature of -40 to +40°C should be in the range of 60–120. The resistance of the breaker winding is 26 ohms.