Ground overcurrent relay
Ground-overcurrent protection relay measures the magnitude of fundamental component of current. The device is dedicated to be used as a protection against earth faults effects. Digital technology ensures high accuracy, stability and dependability of relay.

Manuals, diagrams, technical details


Product description

Protection set

50N/51N ground overcurrent, instantenous or definite-time

Main features

  • One measuring input, Hall sensor construction
  • Measuring and continuous displaying of energising value
  • 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) of pick-up or operation of relay, external blocking signal and proper operation of relay
  • Set of relay outputs for signalling: relay pick-up (K1), operation of relay (K2, K3)
  • Relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

RioT-400 protection relay supervises the magnitude of measured current and compares it to threshold value set by the user. When measured value exceeds threshold value, relay picks-up and after set time delay, activates operation signal. Operation of the relay can be blocked by energising blocking binary input Ubl.


Rated measuring current I0n 5A
Rated frequency 50Hz
Auxilliary voltage 24V DC, 48V – 60V DC,
110V – 230V DC/AC
Setting range of current threshold value (5÷99,9)mA for RIoT-400-05 or
(50÷999)mA for RIoT-400-50 or
(0,5÷4,99)A for RIoT-400-500
Accuracy of current input 2,5%
Relay response time ≤100ms
Setting range of timer (0÷9,9)s
Burden in measuring input ≤0,5VA
Burden in supply module ≤6W
Continuous measured current 2,2In
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 0,12A
Max. breaking capacity by 250V, 50Hz
– inductive load, cosϕ=0,4 3A
Continuous contact carry 5A
Ambient temperature (268÷313)K/(-5÷40)°C
Humidity (with no condensation) ≤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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