The iso685W-D-B is an insulation monitoring device for unearthed AC, 3(N)AC, AC/DC and DC systems (IT systems) in accordance with IEC 61557‑8. It is universally applicable in AC, 3(N)AC, AC/DC and DC systems. AC systems may include extensive DC‑supplied loads such as rectifiers, converters and variable‑speed drives.
The “D” version features a high‑resolution graphic LC display and operating controls for direct operation of the device functions. The “B” version includes the ISOnet function – an internal system disconnect relay that allows several ISOMETER® devices to coexist in coupled IT systems without mutual interference, ensuring that only one device is actively measuring at any time. The “W” version is specially hardened for extreme climatic and mechanical conditions.
DC components existing in AC/DC systems do not influence the operating characteristics. A separate supply voltage allows de‑energised systems to be monitored as well.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…690 V (0.1…460 Hz); DC 0…1000 V
· Supply voltage (Uₛ): AC 24…240 V (50…400 Hz); DC 24…240 V
· Response value range (Rₐₙ₁ / Rₐₙ₂): 1 kΩ … 10 MΩ, two independently adjustable thresholds
· Display: High‑resolution graphic LC display
· Alarm output: Two independent changeover contacts (K1, K2)
· Communication interfaces: RS‑485/BS (Bender sensor bus) for data exchange with other Bender devices, Modbus RTU, BCOM, Modbus TCP and web server
· Analogue outputs: Current or voltage outputs 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically isolated), proportional to the measured insulation value
· Digital I/O: Freely programmable digital inputs and outputs
· History memory: Real‑time clock (13‑day buffer); stores up to 1023 alarm messages with date and time stamp
· Protection class: Internal components IP40, terminals IP20
· Mounting: DIN rail (IEC 60715)
· Dimensions (W × H × D): 108 × 93 × 110 mm
· Weight: < 390 g
W Version Enhanced Features
Compared to the standard version, the W version offers:
· Increased shock and vibration resistance – compliant with mechanical class 3M12
· Conformal coating on electronic components for improved protection against mechanical stress and moisture
· Extended operating temperature range: –40 °C … +70 °C
Key Features
· Insulation monitoring – continuously monitors the entire insulation resistance of an IT system and triggers an alarm when the value falls below a preset response value
· AMPPlus measuring principle – combination of AMPPlus and other profile‑dependent measurement methods; automatic adaptation to existing system leakage capacitance
· Two independently adjustable alarm thresholds – range 1 kΩ…10 MΩ for pre‑warning and main alarm
· isoGraph trend analysis – graphical representation of insulation resistance over time
· History memory – stores 1023 time‑stamped alarm messages (13‑day buffer)
· Connection monitoring – continuously monitors measuring leads
· Automatic device self‑test – with automatic fault reporting
· ISOnet function – internal separation for coupled IT systems (‑B version)
· ISOloop function – special function for ring systems
· Fault memory – selectable latching function
· Password protection – prevents unauthorised parameter changes
· Remote access – via integrated web server for remote setting and diagnosis
· Voltage extension – operating range can be extended via coupling devices
Typical Applications
· Industrial IT systems
· AC, DC or AC/DC main circuits with directly connected DC components (rectifiers, converters, variable‑speed drives)
· UPS systems and battery systems
· Phase‑controlled heaters
· Systems with switch‑mode power supplies
· IT systems with high leakage capacitances
· Marine and offshore installations
· Railway applications
· Photovoltaic and renewable energy systems
· Data centres and telecommunications
· Medical locations (operating theatres, ICUs)
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