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  • Electrical safety for unearthed power supplies (IT systems)
  • Insulation monitoring equipment, insulation fault location systems
  • Power supplies for medical applications
  • Measuring and monitoring relays
  • Electrical safety for earthed power supplies (TN systems)
  • Using renewable energies efficiently: wind power, photovoltaics
  • Test systems for electrical equipment and medical technology


  • As an alternative to the insulation test by means of periodic verification. For MRCD applications in combination with a circuit breaker
  • Alternating, pulsating or AC/DC sensitive measurements can optionally be carried out by selecting the measuring current transformer for each channel
  • Device version RCMS490 with one alarm contact per channel
  • Analysis of the harmonics, DC, THF
  • Adjustable frequency response for protection of persons, fire protection, plant protection

The RCMS system consists of one or more RCMS460-D/-L or RCMS490-D/-L residual current monitors, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the related measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformer used in the case of busbar systems, resp. depend on the cables or conductors that are routed through.

Closed CTBS25 or CTUB100 series measuring current transformers are required to measure AC/DC sensitive residual currents (according to IEC/TR 60755: Type B). They require one 24 V DC power supply unit (e.g. STEP-PS series). CTAC… (closed), WR (rectangular), WS (split-core) and WF… (flexible) series measuring current transformers are used for alternating and pulsating currents (according to IEC/TR 60755: Type A).

Any combination of the various measuring current transformer series can be connected to the monitor measuring channels. Each RCMS460-D/-L and RCMS490-D/-L has 12 measuring channels. Up to 90 residual current monitors can be connected via a BMS bus (RS-485 interface with BMS protocol), thereby up to 1080 measuring channels (sub-circuits) can be monitored.

If this product is to be used for personnel, fire or plant protection, the frequency response can be set accordingly. The measured currents can be analysed for harmonics.


  • Optional AC, pulsed DC or AC/DC sensitive measurement by selecting the respective measuring current transformer for each channel
  • True r.m.s. value measurement
  • 12 measuring channels per device for residual current measurement or digital input
  • Up to 90 RCMS… monitors, up to1080 measuring channels in the system
  • Fast parallel scanning for all channels
  • Response ranges: 10 mA…10 A (0…2000 Hz), 6 mA…20 A (42…2000 Hz), 100 mA…125 A (42…2000 Hz) RCMS…-D4
  • Preset function
  • Adjustable time delays
  • The frequency response characteristics can be set for the protection of persons, fire and plant protection
  • History memory with date and time stamp for 300 data records
  • Data logger for 300 data records/channel
  • Analysis of the harmonics, DC, THD
  • Two alarm relays with one changeover contact each
  • Device version RCMS490 with one alarm contact per channel
  • N/O or N/C operation and fault memory selectable
  • Connection external test/reset button
  • Backlit graphical display (7-segment display) and alarm LEDs
  • Data exchange via BMS bus
  • Password protection for device setting
  • Continuous CT connection monitoring
  • RoHS compliant


  • Measuring and evaluating residual, fault and rated currents of loads and installations in the frequency range of
    - 0…2000 Hz (CTUB100 or CTBS25 series measuring current transformers),
    - 42…2000 Hz (CTAC…, WR…, WS…, WF… series measuring current transformers).
  • Monitoring of currents regarded as fire hazards in flammable atmospheres
  • EMC monitoring of TN-S systems for “stray currents” and additional N-PE connections.
  • Monitoring of N conductors for overload caused by harmonics
  • Monitoring of PE and equipotential bonding conductors to ensure they are free of current
  • Residual current monitoring of stationary electrical equipment and systems to determine test intervals which meet practical requirements in compliance with the accident prevention regulations DGUV V3 (Germany).
  • Personnel and fire protection due to rapid disconnection
  • Monitoring of digital inputs

LINETRAXX® RCMS490-D Variant(s)

TypeSupply voltage USArt. No.
RCMS490-D-1DC 16…94 V / AC 16…72 V, 42…460 HzB94053005
RCMS490-D4-1DC 16…94 V / AC 16…72 V, 42…460 HzB94053011
RCMS490-D-2DC 70…276 V / AC 70…276 V, 42…460 HzB94053006
RCMS490-D4-2DC 70…276 V / AC 70…276 V, 42…460 HzB94053012

Optional Accessories for LINETRAXX® RCMS490-D

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

Downloads for LINETRAXX® RCMS490-D

CE Declarations of conformity RCMS460 - 490 91.8 KB 2022/10/24 05:55:2324.10.2022 05:55:23
Manuals RCMS460/RCMS490 1.7 MB ES2019/05/13 10:31:5413.05.2019 10:31:54D00067
Datasheets RCMS460/RCMS490 864.4 KB ES2019/05/13 10:31:3713.05.2019 10:31:37D00067
Datasheets RCMS460/RCMS490 1.4 MB ZH2019/05/13 10:31:3313.05.2019 10:31:33D00067
Manuals RCMS460/RCMS490 3.5 MB DE2021/11/10 10:49:4510.11.2021 10:49:45D00067
Manuals RCMS460/RCMS490 3.5 MB EN2021/11/10 10:49:5610.11.2021 10:49:56D00067
Datasheets RCMS460/RCMS490 945.7 KB DE2021/11/10 10:50:1610.11.2021 10:50:16D00067
Datasheets RCMS460/RCMS490 912.5 KB EN2021/11/10 10:50:2110.11.2021 10:50:21D00067
Quickstarts RCMS460/RCMS490 1.1 MB DE2021/11/10 08:17:5010.11.2021 08:17:50D00067
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