NewElec’s 330 series low voltage electronic motor protection relay is designed to protect wound rotor motors used on winches or overhead cranes. The motor duty class, starting class, cyclic duration factor, power and load current are of fundamental importance to permit accurate full load protection and adjustment. The inverse thermal curve caters for a cyclic duration factor that offers both stator and rotor protection. This allows the motor to be used to its full duty class and CDF, but still maintain accurate, repeatable protection on small or marginal loads. Maximum load threshold is adjustable between 30 and 100% of primary current. Latched trip LEDs indicate overload and unbalance detection and trip, with a separate trip and thermal lock-out period in process indication.
Available for chassis or flush door mounting, the relay has a test facility and may be fitted with a manual or automatic reset. An additional feature and benefit is the optional thermal trip state indicator that can be mounted as far as a kilometre away from the relay. When the 330 Series relay is placed in the crane operator’s cabin, it provides the operator with a visual display of the operational state of the crane motor in terms of workload. They are thus able to see whether the crane can work harder or whether speed needs to be reduced.
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