Voltage relay
Voltage relay with time-delay function is intendend to be used in protection systems. It allows to control the RMS value of sinewave of voltage with a frequency of 50 Hz. Digital design of relay provides high accuracy, stability and dependability.

Manuals, diagrams, technical details


Product description

Protection set

27/59 Under-/overvoltage protection

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


Rated voltage Un



Rated frequency fn 50Hz
Auxilliary voltage Up 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Setting range of threshold voltage (0,1÷1,2)Un if Un=100V
(38÷456)V if Un=400V
Accuracy of voltage input 2,5%
Relay pick-up time ≤100ms
Setting range of timer (0÷99,9)s
Burden of analog inputs ≤0,8VA/input
Burden of auxilliary voltage supply ≤6W
Continuous voltage withstand of voltage inputs 1,2Un
10 sec voltage withstand of voltage inputs 1,5Un
Relay outputs data – trip purposes outputs (K1, K2, K3):
Max. breaking capacity by 250V DC
– resistive load 0,3A
– inductive load of L/R ≤40ms 0,12A
Max. breaking capacity by 250V, 50Hz
– inductive load, cosϕ=0,4 3A
Continuous contact carry 5A
Relay outputs data – signalling purposes outputs (K4, K5):
Max. breaking capacity – resistive load
– AC current 6A
– DC current 6A/28V; 0,16A/220V
Continuous contact carry 5A
Ambient temperature (268÷313)K/(-5÷40)°C
Relative humidity ≤80%
Ingress Protection degree IP40
Weight ~0,8kg
Dimensions (height x width x depth) 75 x 100 x 120 mm
Electromagnetic compatibility according to EN 50263
Insulation according to EN 60255-5

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