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LINETRAXX® RCMS490-D Blindspot®

  • Multi-channel ground-fault monitoring relay for grounded and high-resistance-grounded AC/DC systems
  • Monitor up to twelve separate channels with individually adjustable alarm trip values
  • Digital display with real-time readings and on-board menu
  • Harmonics analysis and selectable filtering options
  • Individual contact outputs and compatibility with Ethernet and Modbus communication gateways

The RCMS490 series provides ground-fault monitoring for up to twelve separate systems or channels in grounded and high-resistance grounded, AC/DC, single-phase or three-phase systems. The RCMS490 is also compatible with systems that contain power conversion equipment, such as variable frequency drives.

Each channel has an independently adjustable trip value. For AC systems, the trip value is adjustable from 6 mA to 20 A. For DC and mixed AC/DC systems, the trip value is adjustable from 10 mA to 10 A. Each channel is individually monitored with a connected current transformer, available in a wide range of sizes, shapes, and core types.

Three separate time delays are available - a pickup delay, startup delay, and delay on reset. Advanced harmonics analysis and filtering options allow for tailoring use to specific application requirements.

The on-board LCD display shows a detailed system overview, including a chart showing measured ground-fault current in real-time, individual alarm messages for each channel, and an easy-to-use menu for adjusting settings. Advanced harmonics analysis and filtering options allow for tailoring the relay's monitoring capabilities to specific application requirements.

Two configurable Form-C (SPDT) outputs trigger on alarm activation. Additionally, each channel has an individual Form-A (SPST) output. The RCMS490 is compatible with Bender's communication gateways for connecting to Ethernet and Modbus networks.


  • Multi-channel ground-fault protection for solidly and high-resistance grounded AC and DC systems, single-phase and three-phase
  • Meets or exceeds code requirements for ground-fault detection on grounded AC and DC systems where applicable
  • Individually monitor up to twelve systems / circuits from one relay
  • Detailed digital display showing measured values in real-time
  • Individually adjustable trip values, as low as 6 mA and as high as 20 A
  • Connects to current transformers available in a wide range of sizes, shapes, and core types
  • On-board test and reset button with connections for external activation
  • Adjustable time delays (pickup, startup, on reset)
  • Latching or non-latching operation
  • Two Form-C (SPDT) alarm outputs, operating normally energized (failsafe) or de-energized (non-failsafe)
  • Twelve Form-A (SPST) alarm outputs, individually configurable for each monitoring channel
  • Compatible with Bender's communication gateways for connection to Ethernet or Modbus networks


  • Ground fault monitoring on grounded and high-resistance grounded AC/DC systems
  • Systems with variable frequency drives, inverters, and other power conversion equipment
  • General purpose DC systems, per NEC 250.167(B)
  • General power distribution
  • Motors and motor control centers
  • Control systems
  • Heat trace systems, per NEC 427.22 and CEC 62-116
  • Solar arrays, per NEC 690.41(B) (2017 edition), NEC 690.5 (2014 edition), and CEC 64-064(4)
  • Energy storage systems

Downloads for LINETRAXX® RCMS490-D Blindspot®

CE Declarations of Conformity RCMS460 - 490 91.8 KB 2022/10/24 05:55:2324.10.2022 05:55:23
Manuals RCMS460/RCMS490 3.5 MB EN2021/11/10 10:49:5610.11.2021 10:49:56D00067
Datasheets RCMS460/RCMS490 912.5 KB EN2021/11/10 10:50:2110.11.2021 10:50:21D00067
Quickstarts RCMS460/RCMS490 1.1 MB EN2021/11/10 08:17:5010.11.2021 08:17:50D00067
Technical Information CTUB100 wiring addendum (US) 244.9 KB EN2020/11/19 18:14:0519.11.2020 18:14:05

Optional Accessories for LINETRAXX® RCMS490-D Blindspot®

Power supply

TypeArt. No.
STEP-PS/1 AC/24 DC/0.5 (Power supply unit for supplying up to 4 CTUB100 series measuring current transformers)*B94053110
STEP-PS/1 AC/24 DC/1.75 (Power supply unit for supplying up to 14 CTUB100 series measuring current transformers)*B94053111
STEP-PS/1 AC/24 DC/4.2 (Power supply unit for supplying up to 34 CTUB100 series measuring current transformers)*B94053112
DI-1PSM (RS-485 repeater)B95012044

* Not usable with CTUB101

Repeaters and interface converters

TypeDescriptionSupply voltage US*Art. No.
COM465IPCondition Monitor with integrated gateway: Bender system/EthernetAC/DC 24…240 V,
DC, 50…60 Hz
Function package A 
Individual text messages for all devices/channels, device failure monitoring,
email in the event of an alarm
Function package B 
Modbus TCP server for max. 98 * 139 BMS nodes as well as BCOM and
universal measuring devices, SNMP server
Function package C 
Parameter setting of BMS devices as well as BCOM and
universal measuring devices
Function package D 
Visualisation of Bender systems, System visualisation--B75061014
Function package E 
Virtual devices--B75061015
Function package F 
Integration of third-party devices--B75061016
CP907-ICondition Monitor for the connection of Bender BMS devices and
universal measuring devices to TCP/IP networks
CP915-ICondition Monitor for the connection of Bender BMS devices and
universal measuring devices to TCP/IP networks

* Absolute values

Alarm indicator and test combination

TypeArt. No.

Pulsating current sensitive measuring current transformers for RCMS460/490

TypeInternal diameter/mmType of constructionArt. No.
CTAC20ø 20circularB98110005
CTAC35ø 35circularB98110007
CTAC60ø 60circularB98110017
CTAC120ø 120circularB98110019
CTAC210ø 210circularB98110020
WR70x175S70 x 175rectangularB11738
WR70x175SP70 x 175rectangularB11790
WR115x305S115 x 305rectangularB11739
WR115x305SP115 x 305rectangularB11791
WR150x350S150 x 350rectangularB911740
WR150x350SP150 x 350rectangularB911792
WR200x500S200 x 500rectangularB911763
WR200x500SP200 x 500rectangularB911793
WS20x3020 x 30split-coreB98080601
WS50x8050 x 80split-coreB98080603
WS80x12080 x 120split-coreB98080606

AC/DC sensitive measuring current transformers for RCMS460/490

TypeInternal diameter/mmType of constructionArt. No.
CTUB102-CTBC20ø 20circularB78120011
CTUB102-CTBC20Pø 20circularB78120021
CTBS25ø 25circularB98120060
CTUB102-CTBC35ø 35circularB78120013
CTUB102-CTBC35Pø 35circularB78120023
CTUB102-CTBC60ø 60circularB78120015
CTUB102-CTBC60Pø 60circularB78120025
CTUB102-CTBC120ø 120circularB78120017
CTUB102-CTBC120Pø 120circularB78120027
CTUB102-CTBC210ø 210circularB78120019
CTUB102-CTBC210Pø 210circularB78120029

Connection cable for CTUB100 series measuring current transformers

TypeLength/mArt. No.

Flexible measuring current transformers (pulsed DC sensitive) for RCMS460/490

TypeInternal diameter/mmSupply voltage USArt. No.
WF170-1170DC 9,6…94 V / AC 16…72 V, 42…460 HzB78080201
WF170-2170DC 70…300 V / AC 70…300 V, 42…460 HzB78080202
WF250-1250DC 9,6…94 V / AC 16…72 V, 42…460 HzB78080203
WF250-2250DC 70…300 V / AC 70…300 V, 42…460 HzB78080204
WF500-1500DC 9,6…94 V / AC 16…72 V, 42…460 HzB78080205
WF500-2500DC 70…300 V / AC 70…300 V, 42…460 HzB78080206
WF800-1800DC 9,6…94 V / AC 16…72 V, 42…460 HzB78080207
WF800-2800DC 70…300 V / AC 70…300 V, 42…460 HzB78080208
WF1200-11200DC 9,6…94 V / AC 16…72 V, 42…460 HzB78080209
WF1200-21200DC 70…300 V / AC 70…300 V, 42…460 HzB78080210

WF… series measuring current transformers consist of one flexible W…F series measuring current transformer and one RCC420 signal converter.


TypeArt. No.
Mounting clip for enclosure XM420 (1 piece per device)B98060008
XM460 mounting frameB990995
XM490 mounting frameB990996

LINETRAXX® RCMS490-D Blindspot® Variants

Part No.Supply VoltageOutput ContactsOrdering No.
RCMS490-D-1 Blindspot®16-72 VAC (42-460 Hz), 16-94 VDC2 Form-C, 12 Form-AB94053005
RCMS490-D-2 Blindspot®70-276 VAC (42-460 Hz), 70-276 VDC2 Form-C, 12 Form-AB94053006