Current relay
Overcurrent protection RITz-430 is intended to be used as a power system protection component to provide protection of lines, transformers or motors operating at medium or low rated voltage. The relay can be used to protect generators against fault, overload or current unbalance as well.

Manuals, diagrams, technical details


Product description

Protection set

50/51 instantaneous or definite-time overcurrent protection
50N/51N instantaneous or definite-time ground overcurrent protection
49/51 inverse time overcurrent or thermal overcurrent protection
46 negative-sequence overcurrent protection

Main features

  • three phase measuring circuit
  • current value of measured currents
  • real time clock
  • register of 33 or 36 unique events with capability to write up to 300 events
  • parameters of last disturbance recorder, sum of tripped currents counter
  • two binary inputs for external protection with possibility to block relay operation
  • generating of trip signal
  • LCD display and buttons set in order to operation of relay
  • optical indicating (with LED diodes) of pick-ups, trips, measuring circuits continuity, exceeding of permissible of tripped currents sum and proper operation of relay
  • 5 programmable relay outputs (S1-S5)
  • Relay output for signalling power supply module failure or lack of auxilliary voltage
  • RS-485 port for remote control with MODBUS protocol (optional)
  • self test of proper operation of relay
  • relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

The energising values are currents (IL1, IL2, IL3, and I0). On the basis of three phase currents the negative-sequence component I2 is calulated, which indicates the current unbalance. If any of measured values exceeds setting value (set by user), the relay operates in a manner dependind on configuration.

With optional communication interface, the measured currents, binary inputs or outputs, register logs are provided. The PC software provided with relay allows to set the relay, confirm generated signals, graphical display of measured values and browse the register records.


Rated current In 1A or 5A
Rated frequency fn 50Hz
Rated auxilliary voltage Up 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Control voltage Us acc. do aux. voltage
Setting range of threshold current
(0,2÷20)In for „49/50/51” protection function if def.-time char. set
(5÷500)mA or (0,05÷5,00)A – for „50N/51N” protection function if def.-time char. set
(0,2÷2)In for „49/51” protection functions if inv. time char.: A, B, C set
(0,5÷1,5)Ib dla for „49/51” protection function if 49R char. set
(0,1÷1)In for „46” protection function if inv.-time char. A, B, C set
(0,1÷0,5)Ib for „46” protection function if inv.time char 46G set
Setting range of base current Ib
(0,1÷2,5)In for „49/51” protection function if 49R char. set
(0,2÷1,2)In for „49/51” protection function if 49M char. set
(0,5÷2,5)In for „46” protection function if 49G char. set
Accuracy of current input 2,5%
Setting range of sum of tripped currents counter limit (100÷65000)In
Setting range of timer:
  • ..99,9s for definite-time characteristic
  • according to A, B, C characetristic defined by EN 60255-3 regulation
  • according to thermal replica defined by EN 60255-8 regulation
Pick-up time ≤40ms
Burden in analog inputs ≤0,5VA/input
Burden in auxilliary voltage supply ≤6W
Continous thermal withstand of current input 2,2In
1 sec thermal withstand of current input 80In
Dynamic withstand of current input 200In
Relay outputs data (S2 – S5)
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 (S1, watchdog contact)
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 0,8 kg
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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