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The RC48N ground-fault neutral-grounding monitor is used to monitor high-resistance grounded installations. The maximum ground fault current in these systems is limited by a neutral grounding resistor to 5 A, 15 A or 25 A .

The RC48N ground-fault neutral-grounding monitor combines three functions in one device:

  1. Monitoring of the residual current in the grounding conductor.
  2. Voltage monitoring between the transformer neutral and ground.
  3. Monitoring of the grounding resistor for continuity (NGR).

If a value is not within the thresholds, a relay with two voltage-free changeover contacts will be activated.


  • Ground-fault monitor for high-resistance grounded installations with a limited fault current of 5 - 25 A
  • Three-in-one functionality: Residual current, voltage and grounding resistor continuity
  • Measures the residual current by means of a Bender residual current transformer
  • Alarm easily recognizable by LED lights
  • Alarm relay with adjustable trip time
  • Measures resistance value and voltage drop of the NGR via coupling devices
  • Alarm easily recognizable by LED lights
  • The alarm relay can be used for the tripping of a load switch
  • Depending on the type of load switch the operating mode of the alarm relay can be set to N/O operation or N/C operation


  • High-resistance grounded installations with a limited fault current of 5…25 A
  • Mining applications

Downloads for RC48N

CE Declarations of Conformity RC48 84.0 KB 2022/08/12 06:17:2512.08.2022 06:17:25
Manuals RC48N 922.8 KB EN2021/02/12 10:52:3212.02.2021 10:52:32D00426
Manuals RC48N Manual (US) 1.3 MB EN2019/08/16 11:23:2416.08.2019 11:23:24
Technical Information RC48N Application Notes (US) 299.9 KB EN2019/09/20 13:56:4220.09.2019 13:56:42
Application Brochures System Grounding in the Americas, Australia, South Africa and Other Regions 576.7 KB EN2019/05/13 10:29:2213.05.2019 10:29:22
Technical Information Guideline on NGR/Safety Ground Monitoring 234.7 KB EN2019/09/20 13:52:3320.09.2019 13:52:33
Technical Information NGRM500 Retrofit Guide (US) 1.3 MB EN2021/02/10 20:59:2210.02.2021 20:59:22

Optional Accessories for RC48N

Type designationArt.-No.
Remote alarm indicator and operator panelB94071001
Type designationArt.-No.
CD1000 Coupling device, AC 0…1000 VB98039010
CD5000 Coupling device, AC 0…5000 VB98039011
Residual current transformer, 70 mmB911777
Residual current transformer, 105 mmB911778