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Brand: Bender
Bender EDS440-L-4 ISOSCAN Insulation Fault Locator
Description
Locating the first earth fault while the plant keeps running
The Bender EDS440-L-4 is an ISOSCAN insulation fault locator for unearthed DC, AC and three-phase systems (IT systems). It forms an EDS system together with a locating current injector, for example the integrated injector of an iso685-D-P ISOMETER, and external measuring current transformers. The injector sends a locating current into the faulted circuit; the EDS440 detects that signal through the transformers on each feeder and shows which of up to twelve measuring channels carries the fault. According to the datasheet, AC and three-phase systems from 42 to 1000 V and DC systems from 24 to 1500 V can be monitored, depending on the injector.
The EDS440-L-4 (article number B91080202) is the version with an AC/DC 24 to 240 V supply and LED display for the channels; the EDS440-S-1 (B91080201) has a DC 24 V supply and no LED display, and the EDS440-LAF-4 is for CTAF transformers. The W option adds increased shock and vibration resistance and conformal varnish. The EDS441 in the same datasheet is the more sensitive sister device.
Technical specification
| Parameter | Specification |
|---|---|
| Type / article number | EDS440-L-4, B91080202 (EDS440W-L-4: B91080202W) |
| Supply voltage Us | AC/DC 24 to 240 V (-20 % / +15 %); DC, 50 to 400 Hz; power consumption typically max. 4 W / 7 VA at 50 Hz |
| Measuring channels | 12 channels for W…, WR… series current transformers; optional extension by 12 relay channels (IOM441-S); up to 50 EDS devices and 600 channels per system |
| Response value insulation fault location IDL | 2 to 10 mA, uncertainty plus/minus 30 %, at least plus/minus 2 mA; measuring range 1.5 to 50 mA |
| Residual current measurement IDn | 0.1 to 10 A (response value), measuring range 0.1 to 20 A; frequency 42 to 1000 Hz; uncertainty plus/minus 5 % (42 to 60 Hz) |
| Time response | Scanning time for all channels min. 6 s (profile-dependent); response time for residual current max. 400 ms; transformer monitoring max. 18 min |
| Measuring current transformer load | 47 Ohm; rated insulation voltage of transformers 800 V; cable up to 1 m single, 10 m twisted, 40 m shielded |
| Outputs | 2 normally open contacts 13/14 and 23/24 (AC 250 V, 7 A); digital current output 0 or 20 mA; buzzer; 2 digital inputs (test, reset) |
| Interfaces | RS-485: BS bus and Modbus RTU (9.6 to 115.2 kBd), BB bus via connector; device address 0, 2 to 79 (optionally to 159); terminating resistor 120 Ohm |
| Insulation coordination | Rated voltage 1000 V; overvoltage category III; rated impulse voltage 4 kV; range of use up to 2000 m AMSL |
| Environment | Operating temperature -25 C to +55 C (-40 C to +70 C for W option); climatic class 3K22 (3K23 for W); mechanical 3M11 (3M12 for W) |
| Connection | Screw-type or push-wire terminals; AWG 24 to 12 (screw), 0.5 to 0.6 Nm; stripping length 7 mm (screw) and 10 mm (push-wire) |
| Enclosure | Polycarbonate UL 94 V-0; 72 x 93 x 63 mm; IP40 internal, IP20 terminals; DIN rail IEC 60715; EDS440-L weight approx. 242 g |
| Standards listed | DIN VDE 0100-410, DIN EN 61557-9 / IEC 61557-9, DIN EN 50155, DIN EN 45545-2:2016 |
How an EDS system is built
An EDS system has three parts: a locating current injector (often the P version of an ISOMETER), one or more EDS44x fault locators, and the current transformers around each outgoing circuit. When the ISOMETER reports a fault, the injector is enabled; the EDS evaluates the locating signal on each transformer and the faulty channel is indicated on the device, on the iso685 display or over the bus. EDS and ISOMETER communicate on the BS bus, and the EDS440 can also report a plain residual current in the range 0.1 to 20 A. Faulty or interrupted transformer connections are detected by the transformer monitoring function.
Selection notes
- EDS440 (2 to 10 mA) is for general industrial systems; EDS441 (0.2 to 1 mA) is the high-sensitivity variant for smaller leakage currents.
- Choose the supply: L versions take AC/DC 24 to 240 V, S versions take DC 24 V and are powered over the BB bus.
- Transformers listed by Bender for the EDS440 include CTAC20, CTAC35, CTAC60, CTAC120 and CTAC210 (article numbers B98110005 to B98110020).
- Accessories: DI-1PSM repeater (B95012044), DI-2USB converter (B95012045) and IOM441-S relay module (B95012057).
- Use the W option for increased shock, vibration and moisture stress.
Typical GCC uses
Fault location is valuable on installations where an earth fault must be found without shutting down: control rooms, drilling and compressor skids and marine auxiliary supplies. For ISOMETERs that feed the EDS, see the iso685-D-P on this site and the relays category.
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
What does an EDS440 do?
It detects the locating current injected by an ISOMETER and shows which of up to 12 monitored circuits carries the insulation fault.
What is the difference between EDS440 and EDS441?
The EDS440 responds to 2 to 10 mA; the EDS441 responds to 0.2 to 1 mA and is intended for lower fault currents.
Which article number is the EDS440-L-4?
B91080202, with the W option version B91080202W.
Which current transformers are used?
W…, WR… and WS… series transformers; Bender lists CTAC series as alternative for EDS440.
Is Seven Star LLC the manufacturer of ISOSCAN?
No, Seven Star LLC is an independent supplier in Muscat; send us your system voltage and channel count for a quotation.
Datasheets & Documents
- Datasheet Bender EDS440 datasheet (02.2026) 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.
Related products
Frequently Asked Questions
What does an EDS440 do?
It detects the locating current injected by an ISOMETER and shows which of up to 12 monitored circuits carries the insulation fault.
What is the difference between EDS440 and EDS441?
The EDS440 responds to 2 to 10 mA; the EDS441 responds to 0.2 to 1 mA and is intended for lower fault currents.
Which article number is the EDS440-L-4?
B91080202, with the W option version B91080202W.
Which current transformers are used?
W..., WR... and WS... series transformers; Bender lists CTAC series as alternative for EDS440.
Is Seven Star LLC the manufacturer of ISOSCAN?
No, Seven Star LLC is an independent supplier in Muscat; send us your system voltage and channel count for a quotation.
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