With five models to choose from, the N Series motor protection relays from NewElec offer the user a choice of protection features, mounting options, and appropriate motor thermal curves. When used with their own integrated current transformers, which incorporate an earth leakage core balance CT in the same housing, and the inclusion of a 4 to 20 mA loop for monitoring motor loads, significant space and cost savings are achieved.
The N series relays provide overload protection with user-adjustable cold and hot thermal curves linked to a comprehensive thermal memory
The relays provide overload protection with user-adjustable cold and hot thermal curves linked to a comprehensive thermal memory. The user has the ability to select the appropriate thermal curve for the kW rating of the protected motor. This allows the motor to work hard but within its designed thermal envelope. Excessive jogging of the motor will not be tolerated, and the cooling time after an overload trip is never compromised.
Earth leakage protection with a 250 mA sensitivity and a 100 ms trip delay, coupled with harmonic filtering, enables DOL starting of large kW motors without nuisance trips on start up. In addition, these relays recognise the potential danger of opening the main contactor on potentially high energy faults and provide co-ordination so that either the trip is blocked if the earth fault current exceeds a safe level, or use is made of a dedicated earth fault trip contact designed to operate the back-up circuit breaker on detection of such faults.
If required, LED and remote relay fault indication are available.
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