Protection set

Main features

• Three-phase measuring circuit
• Under- or overvoltage operation mode
• Measuring and continuous diplaying of energising value
• Recording of value of voltage during last disturbance
• Binary input in order to block relay operation
• LED display and set of buttons in order to operation of the relay
• optical indicating (with LED diodes) of pick-ups and trips and presence of auxilliary voltage
• Relay output for pick-up signalling purpose (K1), trip (K2, K3), watchdog or lack of aux. voltage purpose (K4) or blocked mode signalling (K5)
• self-test of proper operation of relay
• relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

RET-430A relay compares maximum or minimum value of measured voltage RMS with the threshold value set by the user. The device operates in one of two principles: overvoltage or undervoltage. In the overvoltage mode, the pick-up of relay occurs when any of three measured voltage values exceeds the set value. After the set time-delay, the device generates a trip signal. In the undervoltage mode, the pick-up will occur when any of the three measured values drops below the set value. After the set time-delay, the device generates a trip signal.

Pick-ups and trips are signalled. The trip signal is blocked when binary input for blocking purposes (Ubl) is energised by an external signal

TECHNICAL DATA