Protection set

Main features

• One phase measuring circuit
• Under-/overvoltage and “window” operation mode
• Measuring and continuous displaying of energising value
• Record of value of voltage during last disturbance
• Binary input in order block relay operation
• LED display and set of buttons in order to operation of the relay
• Optical indicating (with LED diodes) current voltage value (U<U1, U1<U<U2, U>U2), external blocking signal and proper operation of relay
• Relay output for signalling: under- (U<U1) or overvoltage (U>U2) relay pick-up (K1, K3), operation (K2) of the relay (U<U1 or U>U2), failure or lack of aux. voltage (K4) or relay interlock by external signal (K5)
• Self-test of proper operation of relay
• Relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

If the measured voltage value (U) drops below the “low” threshold value (U<U1), the relay picks-up K1 output (undervoltage status) and than, after set time delay, closes K2 output; if the measured value is between the “low” and “high” threshold values (U1<U<U2) the outputs K1, K2, K3 are inactive (“window” status); if the measured value rises above the “high” threshold value (U>U2), the relay picks-up K3 output (overvoltage status) and than, after set time delay, closes K2 output. Activation of time-delayed output (K2) can be blocked by energising the blocking input (U_bl)

TECHNICAL DATA