Over-crank Protection for Heavy Duty Starting Motors

Over-Crank protection devices (the OCP designation you see in the part number on some motors) incorporated in some types of starting motors are a very good idea, and an option worth considering. The actual OCP (to see if your unit has one look for the two pronged plug outside the field case on the motor near the back of the unit) circuit breaker is contained in a bi-metal connection between the field coil and brush holder assembly within the body of a starting motor. This device, by the act of the bi-metal connection opening due to overheating if the motor is cranked too long, stops starting motors from continuously engaging before they can self-destruct. In this way OCP equipped motors can be prevented from burning out. It is possible, but not recommended, that the OCP controls can be bypassed. OCP protection helps to stop starting motor failures in high noise conditions, where it is difficult to determine if the prime engine has started, cold weather situations and conditions where low battery voltage contributes to hard starting. For additional technical information relative OCP use, please contact one of our field engineers via Contact Us at ESS.