Versatile overcurrent protection relay
Versatile current protection relay dedicated to be used power protection systems in order to protect power objects against faults, overloads and current unbalance condition. The relay integrates functions of protection, measuring, control and recording.

Manuals, diagrams, technical details


Product description

Protection set

50/51 instantaneous/definite-time, three-stages, three-phase overcurrent protection
51 overcurrent, inverse-time
50N/51N ground overcurrent, definite-time, two-stages protection
51N ground overcurrent, inverse-time
49M thermal overload, inverse-time current protection
49R thermal overload, inverse-time current protection
46 negative-sequence overcurrent protection, definite-time and inverse-time
46G negative-sequence overcurrent protection, inverse-time
62 external protection

Main features

  • 4 measuring inputs (IL1, IL2, IL3, I0)
  • Different types and versions depending on relay configutarion
  • Measurement of currents and their phase shifts
  • Real time clock
  • Event recorder with capacity up to 500 records
  • Last disturbance parameters recorder
  • Samples or magnitudes of disturbance and logic states recorder
  • Tripped currents counter
  • Two binary inputs for cooperation with external protection purposes, possibility to be used as blocking inputs
  • Trip pulse
  • alphanumeric LCD display (2×16) and six buttons enabling operation of the relay
  • visual indication (by LED diodes) of pick-ups and trips, exceeding of counters or proper operation of relay
  • 7 programmable relay outputs (S1-S7)
  • RS-485 port for communication with PC computer or supervision and control system (MODBUS-RTU protocol)
  • self-test system of proper operation of relay control
  • enclosure construction enables three types of mounting: 35 mm rail, surface mount or flush mount

The energising values are input current: IL1, IL2, IL3 and I0. On the basis of measured currents, the negative-sequence current I2 is calculated, which is the measure of current unbalance. Exceeding of any set threshold value causes the reaction of the relay according to the configuration. Communication interface provides following data: current measured and calculated values of voltages and their phase shifts, current inputs and outputs statuses, relay outputs states and registered runs. Software provided with the relay allows to: relay configuration, reading and writing settings, picked-up signals quitting, graphic preview of measured values and registered records preview.


Rated measuring current In 1A, 5A
Rated frequency 50Hz
Auxilliary voltage Upn 24V DC, od 48V do 60V DC,
110V DC/AC, 230V DC/AC
Control voltage acc. to aux voltage
Setting range of current threshold values
50/51 protection functions 0,2…30In
50N/51N def.time protection functions 5…500mA or 5…5000mA
50N/51N inv.time protection functions 5…100mA or 5…1000mA
51 inv. time char. A, B, C 0,2…2 In
49R thermal char. 0,5…1,5Ib
46 protection function 0,1…1 In
46G protection function  0,1…0,5 Ib
Base current Ib setting range:
49R protection function 0,1…2,5 In
49M protection function  0,2…1,2 In
46G protection function  0,5…2,5 In
Setting range of tripped currents counter (1÷ 65000)In
Setting range of operating time
definite-time operating characteristics 0…99,9s
according to A, B, C characteristics defined by EN60255-3 regulation
according to 49M protection function characteristic, defined by EN-60255-8 regulation
Relay response time for current protection functions ≤40ms
Accuracy of current inputs 2,5%
Accuracy of time measuring 1%÷10ms
Burden in measuring inputs ≤0,5VA/input
Burden of supply module ≤5W
Continuous measured current 4In
Thermal withstand (1s) 80In
Dynamic withstand 200In
Relay outputs data:
Max. breaking capacity by 250V DC
resistive load 0,3A
inductive load of L/R ≤40ms 0,1A
Max. breaking capacity by 250V, 50Hz
inductive load, cosϕ=0,4 3A
Continuous contact carry 6A
Amient temperature (253÷328)K/(-20÷55)°C
Relative humidity ≤80%
Ingress Protection degree P40
Weight ~0,8kg
Dimensions (height x width x depth 75 x 100 x 120 mm
Electromagnetic compatibility according to PN-EN 60255-26
Insulation according to PN-EN 60255-5

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