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Brand: Bender
Bender RCMS460-D-2 12-Channel Residual Current Monitor
Description
Twelve residual-current channels in one DIN rail device
The Bender RCMS460-D-2 is a multi-channel residual current monitor from the LINETRAXX range for earthed AC, DC and AC/DC systems (TN and TT systems). Each device has 12 measuring channels for residual current measurement or digital inputs, so one unit can supervise a dozen feeders through external measuring current transformers. The datasheet explains that the transformer type decides the sensitivity: CTAC, WR, WS and WF series cover alternating and pulsating currents (type A), while closed CTBS25 or CTUB100 series transformers cover AC/DC-sensitive currents (type B per IEC/TR 60755). Up to 90 devices can be linked on a BMS bus, giving up to 1080 channels.
The -2 in RCMS460-D-2 means the 70 to 276 V supply version (AC/DC); the -1 version takes 16 to 94 V. The article number is B94053002. The D4 variants add an extended current measurement range for channels 9 to 12.
Technical specification
| Parameter | Specification |
|---|---|
| Type / article number | RCMS460-D-2, B94053002 (RCMS460-D-1 = B94053001 for 16 to 94 V) |
| Supply voltage Us (-2) | AC 70 to 276 V (50/60 Hz) / DC 70 to 276 V; power consumption max. 10 VA |
| Measuring channels | 12 per device, up to 1080 in a system (90 devices on BMS bus) |
| Measuring current transformers | CTAC, WR, WS, WF series (type A); CTUB100, CTBS25 series (type B); transformer monitoring on/off |
| Measuring range | 0 to 30 A with type A transformers; 0 to 20 A with type B transformers; frequency 0 to 2000 Hz (type B) or 42 to 2000 Hz (type A) |
| Response values | Alarm IDn2 10 mA to 10 A (type B) or 6 mA to 20 A (type A); prewarning IDn1 10 to 100 % of IDn2; hysteresis 2 to 40 % |
| Time response | Start-up delay 0 to 99 s; response delay 0 to 999 s per channel; delay on release 0 to 999 s; operating time max. 180 ms at 1 x IDn1/2, max. 30 ms at 5 x IDn1/2; scanning time for all channels max. 180 ms |
| Displays and memory | Backlit graphical display (D versions); history memory and data logger of 300 records; error of indication plus/minus 10 % |
| Outputs | 2 x 1 changeover contact (RCMS460); N/C or N/O operation; 10 000 cycles; common alarm relay 230 V 5 A / 3 A, 24 V 1 A |
| Interface | RS-485 / BMS, 9.6 kbit/s, up to 1200 m; terminating resistor 120 Ohm switchable; device address 1 to 90 |
| Insulation coordination | D-2 version: rated insulation voltage 250 V, impulse voltage 6 kV for supply side; overvoltage category III; pollution degree 3 |
| Transformer cable lengths | CTAC/WR/WS/WF: up to 1 m single wire, 10 m twisted, 40 m shielded; CTUB100 and CTBS25: up to 10 m |
| Environment | Operating temperature -25 C to +55 C; climatic class 3K22; mechanical class 3M11; EMC per EN 62020 |
| Connection | Screw terminals 0.2 to 4 mm2 rigid / 0.2 to 2.5 mm2 flexible (AWG 24 to 12), 0.5 to 0.6 Nm; for UL use 60/70 C copper only |
| Enclosure | Polycarbonate UL 94 V-0, IP30 / IP20 terminals; DIN rail IEC 60715 or 2 x M4 screws; weight max. 300 g |
Frequency response, offsets and combinations
For personnel, fire or plant protection the frequency response can be set per channel with cut-off frequencies of none, IEC, 50 Hz or 60 Hz, so that harmonics from drives either count or are filtered. An offset of 0 to 20 A (30 mA default) and a factor for additional transformers allow current ratios to be matched. The measured currents can be analysed for harmonics. A residual current relay of this kind does not disconnect by itself: the alarm relays and the BMS bus signal a controller or a COMTRAXX gateway such as the COM465IP, which Bender lists as an accessory.
Installation notes
- Type B (AC/DC) measurement needs CTBS25 or CTUB100 transformers, supplied with 24 V DC; Bender lists STEP-PS power supplies (B94053110, B94053111 and B94053112) for up to 4, 14 and 34 CTUB100 transformers.
- Run the BMS bus in shielded twisted pair J-Y(St)Y min. 2 x 0.8, shield earthed at one end only.
- Set the device address unique on the bus and switch on the terminating resistor at the last device.
- Transformer wiring: keep to the maximum cable lengths in the table; connect via plug-in connector CTXS.
- An RS-485 repeater DI-1PSM (B95012044) is available for longer bus runs.
Where it is used
Residual current monitoring detects developing insulation deterioration in earthed systems before it trips a breaker. Data centres, process plants and large commercial buildings in the Gulf use multi-channel monitors in distribution boards. See the relays category for other monitoring devices.
Selection and installation notes
Insulation and residual current monitoring devices are selected from the system type (IT, TN or TT), the system voltage, the leakage capacitance and the alarm levels needed. Connect the device to the system and to earth as the manual shows, set the response values from the system design, check the coupling or measuring current transformer and its wiring, and test the alarm and relay outputs after commissioning. Do not do an insulation test of the plant with the monitor connected unless the manual allows it.
Information needed for a quotation
Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.
Documents and supply information
The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.
Frequently asked questions
How many channels does the RCMS460-D-2 have?
12 measuring channels for residual current or digital input, and up to 90 devices on one BMS bus for 1080 channels.
Can it detect DC fault currents?
Yes, with CTBS25 or CTUB100 series transformers it measures AC/DC-sensitive (type B) residual current; other transformer series give type A measurement.
What is the supply voltage?
The -2 version takes AC or DC 70 to 276 V; the -1 version takes 16 to 94 V.
Does it include a display?
Yes, the D versions have a backlit graphical display and a history memory of 300 data records.
Is Seven Star LLC the manufacturer?
No. Seven Star LLC is an independent supplier in Muscat; send us the number of feeders and transformer types for a quotation.
Datasheets & Documents
- Datasheet Bender RCMS460 datasheet (07.2023) Download
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About brand
Bender is a German manufacturer of electrical safety monitoring devices, founded in 1946 and based in Grünberg. It is known for ISOMETER insulation monitoring devices for unearthed (IT) systems and for residual current monitoring, insulation fault location and grid protection relays.
Seven Star LLC is an independent supplier in Muscat. We list Bender monitoring devices for power, oil and gas, marine, hospital and industrial installations in Oman and the GCC.
Bender product series
Insulation monitors include the IR425-D4-2 for systems up to 300 V, the iso685-D-P for 690 V AC systems, the isoUG425-D4-4 earth fault monitor for 12-120 V DC and the IRDH275BM-7 for medium voltage networks. The EDS440-L-4 ISOSCAN locates the faulty feeder once an insulation fault is detected.
Residual current monitors include the RCMS460-D-2 twelve-channel monitor and the RCMA420-D-2 AC/DC monitor for 10 to 500 mA. The NGRM700 supervises neutral grounding resistors, the VMD460-NA-D-2 is a network and system protection relay, and the MK2430-11 COMTRAXX is a remote alarm indicator with twelve inputs.
Where Bender devices are used
IT power systems in plants, ships, hospitals and data centres, DC supplies and battery systems, generator and solar connections to the grid, and earthing systems with neutral grounding resistors.
Ordering Bender devices: what we need
Send the Bender type and article number, system type (IT, TN or TT), nominal voltage and frequency, the supply voltage of the device and the alarm and communication outputs needed.
Browse Bender products by category: Switchgear, Enclosures & Distribution.
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Frequently Asked Questions
How many channels does the RCMS460-D-2 have?
12 measuring channels for residual current or digital input, and up to 90 devices on one BMS bus for 1080 channels.
Can it detect DC fault currents?
Yes, with CTBS25 or CTUB100 series transformers it measures AC/DC-sensitive (type B) residual current; other transformer series give type A measurement.
What is the supply voltage?
The -2 version takes AC or DC 70 to 276 V; the -1 version takes 16 to 94 V.
Does it include a display?
Yes, the D versions have a backlit graphical display and a history memory of 300 data records.
Is Seven Star LLC the manufacturer?
No. Seven Star LLC is an independent supplier in Muscat; send us the number of feeders and transformer types for a quotation.
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