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Brand: Bender
Bender iso685-D-P ISOMETER Insulation Monitor 690 V AC
Description
A main-circuit ISOMETER with built-in locating current injector
The Bender iso685-D-P is an insulation monitoring device for unearthed AC main circuits up to 690 V, including systems with galvanically connected rectifiers and inverters, and for unearthed DC systems up to 1000 V. The D in the type means a built-in graphical display; the P version adds an integrated locating current injector, so that together with EDS44x insulation fault locators the faulty feeder can be found while the plant stays in operation. The datasheet describes automatic adaptation to the system leakage capacitance, a combination of the AMPPLUS and other profile-specific measuring methods, and two response value ranges from 1 kOhm to 10 MOhm.
The article number of the iso685-D-P is B91067030. The same datasheet covers the iso685W-D-P (W option, increased shock and vibration resistance and -40 to +70 C operation, B91067030W) and the separate-display versions iso685-S-P with FP200 panel (B91067230).
Technical specification
| Parameter | Specification |
|---|---|
| Type / article number | iso685-D-P, B91067030 (integrated display) |
| System voltage Un | AC 0 to 690 V; DC 0 to 1000 V; frequency range DC and 0.1 to 460 Hz; UL applications AC/DC 0 to 600 V; tolerance +15 % |
| Supply voltage Us | AC 24 to 240 V, 50 to 400 Hz; DC 24 to 240 V; power consumption max. 12 W (21 VA at 50/60 Hz, 45 VA at 400 Hz) |
| Response values | Ran1 and Ran2 adjustable 1 kOhm to 10 MOhm; relative uncertainty plus/minus 15 %, at least plus/minus 1 kOhm; hysteresis 25 %, at least 1 kOhm |
| Response time | Profile-dependent, typically 4 s (RF = 0.5 x Ran of 10 kOhm and Ce = 1 uF); start-up delay 0 s to 10 min |
| Measuring circuit | Measuring voltage plus/minus 10 V or plus/minus 50 V depending on profile; internal resistance min. 124 kOhm; extraneous DC voltage max. 1200 V; permissible Ce 0 to 1000 uF depending on profile |
| Measuring ranges | fn 0.1 to 460 Hz; Un AC 25 to 690 V and DC 0 to 1000 V; Ce 0 to 1000 uF (plus/minus 10 % plus/minus 10 uF) |
| Display | Graphic display 127 x 127 pixels, 40 x 40 mm, range 0.1 kOhm to 20 MOhm; isoGraph insulation trend; history memory for 1023 alarm messages with real-time clock (three days buffer) |
| Inputs and outputs | 3 digital inputs, 2 digital outputs, 2 changeover alarm relays (AC-13 230 V 5 A), 1 analogue output 0(4) to 20 mA, 0 to 400 uA, 0 to 10 V or 2 to 10 V |
| Interfaces | Ethernet RJ45 (web server, Modbus TCP, BCOM, 10/100 Mbit/s); RS-485 with isoData, BS bus and Modbus RTU (device address 1 to 90) |
| Network functions | ISOnet (2 to 20 devices), ISOloop (2 to 10), EDSsync (2 to 10) |
| Insulation coordination | Rated voltage 1000 V; overvoltage category III; rated impulse voltage 8 kV (measuring circuit) and 4 kV (other circuits) |
| Environment | Operating temperature -25 C to +55 C; transport -40 C to +85 C; climatic class 3K22; altitude up to 3000 m AMSL; EMC per IEC 61326-2-4 |
| Connection | Screw-type terminals, AWG 24 to 12, tightening torque 0.5 to 0.6 Nm, stripping 7 mm; IP40 internal, IP20 terminals; DIN rail IEC 60715 |
Profiles, ISOnet and fault location
The iso685 selects a device profile for the type of installation, for example a rectifier-fed DC link, so that the measuring voltage and permissible leakage capacitance match the plant. ISOnet lets several ISOMETERs share interconnected IT systems: each device is internally disconnected from the system when another one is measuring, and ISOnet priority can give one device permanent priority. ISOloop supports ring systems in which all systems are coupled. With the P version, the injected locating current is picked up by EDS440 or EDS441 devices and measuring current transformers, and the iso685 displays the selectively located faults and allows parameter setting of the EDS system.
Selection notes
- Pick D (display integrated) for door-mounted use; the S version needs the detached FP200 display.
- Use the W option for increased shock, vibration and moisture stress.
- Pair with the EDS440-L-4 (B91080202) or EDS441 insulation fault locators, and with W, WR or WS current transformers, for fault location.
- Supply from AC or DC 24 to 240 V, so one device type covers most control supplies.
- Check the system leakage capacitance against the profile limit before commissioning.
Typical GCC uses
Offshore and onshore oil and gas, power generation and process plants use unearthed DC and AC systems for UPS, rectifier and drive supplies. Insulation monitoring with fault location reduces the time to find a first earth fault. See the relays category for other Bender monitoring devices on this site.
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 the P in iso685-D-P mean?
The P version has an integrated locating current injector for selective insulation fault location with EDS44x devices.
What voltages can the iso685-D-P monitor?
AC systems up to 690 V and DC systems up to 1000 V; for UL applications AC/DC up to 600 V.
Does it have network connections?
Yes, Ethernet with web server, Modbus TCP and BCOM, plus RS-485 with Modbus RTU, BS bus and isoData.
What is the article number?
B91067030 for the iso685-D-P; the W version is B91067030W.
Does Seven Star LLC make Bender devices?
No, Seven Star LLC is an independent supplier in Muscat. Send us your system voltage and fault-location needs for a quotation.
Datasheets & Documents
- Datasheet Bender iso685 datasheet (06.2026) 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.
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Frequently Asked Questions
What does the P in iso685-D-P mean?
The P version has an integrated locating current injector for selective insulation fault location with EDS44x devices.
What voltages can the iso685-D-P monitor?
AC systems up to 690 V and DC systems up to 1000 V; for UL applications AC/DC up to 600 V.
Does it have network connections?
Yes, Ethernet with web server, Modbus TCP and BCOM, plus RS-485 with Modbus RTU, BS bus and isoData.
What is the article number?
B91067030 for the iso685-D-P; the W version is B91067030W.
Does Seven Star LLC make Bender devices?
No, Seven Star LLC is an independent supplier in Muscat. Send us your system voltage and fault-location needs for a quotation.
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