rolling door openers are used to drive rolling door (rolling shutter) from 500kg to 1000kg. Which featured with powerful starting strength, overworking for a short time and overheat protection when overloaded. In case of power failure, a release chain can be used to operate door manually. Advanced Features: 1. Loading up to 1000kg 2. Available in 3-phase power (KJ500 & KJ600) 3. Limit switch unit enables precise adjustment of door in both up and down positions 4. Overhead protection 5. Electric and manual operations 6. Release chain in case of power failure 7. Control panel wiring are available to safety device, alarm lamp and remote controller