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The E 492 wattmetric relay receives information on the voltage (V) and on the current, calculates the cos q value, therefore the following:
(ACTIVE POWER) w = 1.73 cos q
An active power relay is typically used to check the active power absorbed by an electric motor which provides direct information on the load applied to that motor. Such information is more accurate than the one given by the current value. Actually, the cos q variations can change the power values without affecting current values markedly.
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SCR Power Controller Series ZC/PC
• Extends Heater Life – Reduces Thermal Shock
• All Solid-State Design – No Maintenance Required
• Soft-Start and Voltage Limit (Optional on PC)
• Zero Voltage or Phase Angle-Fired
• Full Power Rating at 120° F (49° C) Ambient Temperature
• 10 - 35 amps
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750:Power relays plug-in type - 3x16A
* to switch higher output (load) than is the capacity of the switched element (amplifi er) or multiply contacts
* auxiliary control of light, signalization, free-lever signal box, boiler,signalling receiver on electrometers, heaters
* in standard included: mechanical indication, LED indication, cadmium-free gold plated contact, detent lever - all included in price!
* quality prooved and certifi ed in EZU, VDE, UL and other testing laboratories
* 750 - 3x changeover contact 16 A
* 782 - 4x changeover contact 8 A
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Power relays, Contactor relays
