Current, time-delayed relay
Current relay with time-delay function is intendend to use in protection systems. It allows to control the RMS value of sinewave of current with a frequency of 50 Hz. Digital technology provides high accuracy, stability and dependability.

Manuals, diagrams, technical details


Product description

Protection set

51 overcurrent, definite-time characteristic

Main features

  • three phase measuring circuit
  • possibility to work in one, two or three phase protection systems
  • measuring and continous diplaying of energising value
  • record of value of current during last disturbance
  • binary input 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, external blocking signal, measuring circuits continuity and proper operation of relay
  • Relay output for pick-up signalling purpose (K1) and 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

RIT-430A controls the RMS values of measuring currents, selects the maximum value and compares it with setting value of current, which is set by user. If one of measured values exceeds the setting value, the relay pick-ups and after set time-delay, the trip signal is generated. Operation of relay is blocked when blocking input (Ubl) is energised.


Rated current In 1A, 5A, 1A or 5A
Rated frequency fn 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Setting range of threshold current (0,05÷5)In or (0,2÷20)In
Accuracy of current input 2,5%
Pick-up time ≤40ms
Setting range of timer (0÷99,9)s
Burden of analog inputs ≤0,5VA/input
Burden of auxilliary voltage supply ≤6W
Continous thermal withstand of current input 2,2In
1 sec thermal withstand of current input 80In
Dynamic withstand of current inputs 200In
Relay outputs data (K1, K2, K3)
Max. breaking capacity by U=250V DC
– resistive load 0,3A
– inductive load of L/R=40ms 0,12A
Max. breaking capacity by U=250V, 50Hz
– 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%
Igress Protection degree IP40
Weight 0,8kg
Dimensions (width x hight 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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