Why is the NGR continuously monitored in an HRG system?
The guide illustrates this model's “Continuous NGR monitoring in an HRG system” function with a product example.
Read the technical guideIndustries / Neutral grounding resistor monitoring · NGR / LINETRAXX® NGRM500
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Bender LINETRAXX® NGRM500NGR Monitoring
Condition monitoring of the neutral grounding resistor in high-resistance grounded (HRG) systems.
TECHNICAL SPECIFICATIONS
Understand the application scope.
The exact model, accessories and operating conditions are selected according to the relevant manufacturer document.
- NGRM500 is exclusively for HRG; NGRM550 is for LRG systems.
- Monitoring current through the NGR, voltage and resistance condition.
- Passive and active measurement methods; Ethernet and web interface.
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MODEL, ORDER AND ACCESSORY INFORMATION
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Model options and technical values
| Model | Supply voltage U S / Frequency range Hz | Order code |
|---|---|---|
| NGRM500 | AC 48…240 V, 40…70 Hz / DC 48…240 V | B94013500 |
Explore compatible accessories
Compatible accessories · 1
| Model | Voltage U sys | Order code |
|---|---|---|
| CD1000 | 400…690 V | B98039010 |
| CD1000-2 | 400…1000 V | B98039053 |
| CD5000 | 1000…4200 V | B98039011 |
| CD14400 | 4300…14550 V | B98039054 |
| CD25000 | 14551…25000 V | B98039055 |
Manufacturer table notes (original language):
Measuring current transformer
Compatible accessories · 2
| Model | Voltage / current | Order code |
|---|---|---|
| CTAC35 / CTAC60 / CTAS50 / CTAS80 / CTAS120 | AC up to 30 A | B98110007 / B98110017 / B98110009 / B98110010 / B98110011 |
| CTUB103-CTBC35 | AC/DC up to 10 A | B78120030 |
| CTUB103-CTBC60 / CTUB103-CTBC120 | AC/DC up to 25 A | B78120031 / B78120032 |
| CTB31…CTB51 series | AC > 30…1000 A | B980860xx |
Manufacturer table notes (original language):
Voltage supply for measuring current transformers CTUB103…
Compatible accessories · 3
| Model | Maximum number of connectable measuring current transformers | Order code |
|---|---|---|
| STEP-PS/1 AC/24 DC/0.5 | 2 | B94053110 |
| STEP-PS/1 AC/24 DC/1.75 | 7 | B94053111 |
| STEP-PS/1 AC/24 DC/4.2 | 17 | B94053112 |
Based on tables on the manufacturer's current product page. For marked-value footnotes, connection conditions and variant suitability, review Bender product source ↗ and the technical documents together. Listing an order code does not commit to stock availability or delivery time.
BENDER MANUFACTURER DOCUMENTS
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8 / 8 documents
Datasheet
NGRM500/NGRM550
NGRM5xx_D00373_D_XXEN.pdfOpen document ↗Operating manualNGRM500/NGRM550
NGRM5xx_D00373_M_XXEN.pdfOpen document ↗Operating manualNGRM…-Modbus
NGRMx_D00292_A_XXEN.pdfOpen document ↗Quick startNGRM500/NGRM550
NGRM5xx_D00373_Q_XXEN.pdfOpen document ↗Conformity documentNGRM
CEKO_NGRM.pdfOpen document ↗BrochureNeutral Grounding Monitoring for 800 V DC AI Factory Power Architectures
BU-I_DataCentre_NGR_Fly_A4_en.pdfOpen document ↗BrochureNGRM550 & NGRM750
NGRM550_NGRM750_Flyer.pdfOpen document ↗Other technical documentsHow to Size an NGR (US)
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Current variants and other documents · Bender ↗
Data sheets, operating manuals and related manufacturer documents. File names identify the model or accessory; documents retain their original language.
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