Operator Interfaces, Switches & Relays


Protection relay for winches and overhead cranes

February 2004 Operator Interfaces, Switches & Relays

Designed specifically to protect wound rotor motors on winches or overhead cranes, NewElec's 330 Series motor protection relays provide accurate, full load protection and adjustment. Their inverse thermal curve caters for CDF, which provides both stator and rotor protection.

The overload protection feature allows the motor to be used to its full duty and CDF. Accurate repeatable protection on small or marginal loads is maintained with a user-selectable maximum load threshold, adjustable from 30 to 100% of the CT primary current.

Unbalance and phase loss protection utilises a user-selectable detection threshold on a continuous linear scale between 2 to 40% of the maximum motor load current value. The 330 Series calculates true RMS load patterns as well as heating and cooling rates, which ensures that motor loading and CDF are maintained within the tolerable thermal envelope of the motor. LEDs indicate overload threshold and trip; unbalance detection threshold and trip, separate trip indication and the thermal lockout period.

The 330 Series relays are available for either chassis or flush door mounting. They have a test facility and may be fitted with a manual/auto-reset facility. Terminals exist on the rear of the relays for the addition of a NewElec thermal trip state indicator.

For more information contact Luc Dutrieux, NewElec, 012 327 1729, sales@newelec.co.za, www.newelec.co.za



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