The CKO relay is a time delayed overcurrent relay equipped with a cylinder unit instantaneous trip. It is used in applications where negligible response by the instantaneous unit to the dc component of fault current and/or high dropout ratio is required. Transient overreach will not exceed 5 percent for this instantaneous trip unit for circuit angles up to 80 degrees.
The instantaneous unit may be “torque controlled” by an external contact where desired. Closure of the external contact prevents operation of the instantaneous unit. Dropout ratio of the instantaneous unit is 97 percent or greater.
- Long product life
- Ease of application
- Reliable protection
- High-quality design