Protection set

Main features

• One phase measuring circuit
• Under-/overvoltage operation mode (selectable)
• 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: relay pick-up (K1), operation (K2, K3) of the relay, 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

RET-412A relay compares the RMS value of measured voltage with the threshold value set by the user. The device operates in one of two operation modes: overvoltage or undervoltage. In the overvoltage mode, relay picks-up when measured voltage value exceeds set threshold value. After the set time-delay, the device generates a trip signal. In the undervoltage mode, relay picks-up when any measured value drops below set threshold 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 (U_bl) is energised by an external signal.

TECHNICAL DATA