INPUT Voltage pins : 10, 12, 14 Input Resistance = 800 kΩ See REMARK 3. Current pins : 15,16. No specific order to be followed. The maximum threephase voltage is 415 Vac. For higher voltages, it is requested the application of: M 08 : Threephase drop resistances + CT for insulation. OUTPUT RELAY 5A(NO) 3A(NC)-230 Vac carico resistivo W 2-1 NO device not 2-3 NC supplied or in alarm SUPPLY: single voltage 2,5VA 50-60 Hz -tolerance ±10% 19-20: 115Vac or 230 Vac or 24 Vac or 48 Vac DIMENSIONS: 105x90x75 mm “modular” for rail DIN flush mounting - Accessory on request: M48E transparent cover, fitted for tight closure. WORKING TEMPERATURE: 0÷70°C WEIGHT: Kg 0,550 COLOUR: grey

FUNCTION The wattmetric relay E 491N measures the voltage (V) and the current in the line (I), besides it computes the cosj and the ACTIVE POWER as product of: W = 1,73 V I cosj USE The electric motor is the most common load to be controlled by an active power relay. The active power supplied to the motor gives the direct information of the instant load of the motor itself. Such information is more accurate than the one given by the current value. As a matter of fact the cosj variations may change the power value without affecting the current value.

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