ZRO Board-to-Wire Sealed Connectors JST Automotive ZRO Board-to-Wire Sealed Connectors are sealed, lever type 48- and 36-circuit interface connectors. The JST ZRO Connectors feature a lever to decrease the connector mating force. This automotive connector series features a 7A power and 5A signal DC current rating with a voltage rating of 50VDC. The ZRO components are heat resistant and operate over a -40°C to +120°C temperature range (including temperature rise in applying electrical current).