Voltage relay
Voltage relay intended 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, time-delayed

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 (Ubl) is energised by an external signal.


Rated voltage Un 100V or 400V
Rated frequency fn 50Hz
Rated auxilliary voltage Up 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Setting range of voltage threshold values (0,1÷1,2)Un for Un=100V
(38÷456)V for Un=400V
Accuracy of voltage input by freq. 50Hz 2,5%
Pick-up time ≤100ms
Setting range of timer (0÷99,9)s
Burden of analog inputs ≤0,8VA
Burden of auxilliary voltage supply ≤6W
Continuously voltage withstand of voltage inputs 1,2Un
10 sec voltage withstand of voltage inputs 1,5Un
Relay outputs data (K1, K2, K3)
Max. breaking capacity by U=250V DC
– resistive load 0,3A
– inductive load of L/R ≤ 40 ms 0,12A
Max. breaking capacity – for AC 250 V, 50 Hz
– inductive load of cosϕ=0,4 3A
Continuous contact carry 5A
Relay outputs data (K4, K5)
Max. breaking capacity by 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 0,7kg
Dimensions (height x width x depth) 75 x 100 x 120 mm
Electromagnetic compatibility according to PN-EN 50263
Insulation according to PN-EN 60255-5

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