The iso685-S-P is an insulation monitoring device from Bender, compliant with IEC 61557‑8 and IEC 61557‑9, designed for unearthed IT systems. It is a sensor variant (S type) with no display or operating keys and must be used together with the Bender FP200 front panel. The suffix -P indicates an integrated locating current injector for selective insulation fault location.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…690 V, 1…460 Hz; DC 0…1000 V
· Supply voltage (Uₛ): AC 24…240 V, 50…400 Hz; DC 24…240 V
· Alarm response values (Rₐₙ₁ / Rₐₙ₂): 1 kΩ … 10 MΩ, two independently adjustable thresholds
· Max. permissible system leakage capacitance (Cₑ): ≤ 1000 μF (depending on the selected measuring profile)
· Operating temperature: –25 °C … +55 °C
· Mounting: DIN rail mounting
· Order number: B91067230 (iso685-S-P + FP200 combination)
Key Features
· Locating current injector (-P core feature) – Built‑in locating current generator; together with EDS series insulation fault locators and measuring current transformers, a complete insulation fault location system can be formed
· Sensor variant (S type) – No display or operating keys; must be used with FP200 front panel
· AMPPlus measuring principle – Automatically adapts to system leakage capacitance and DC components
· Predefined measurement profiles – Power circuit, control circuit, generator, high capacitance, frequency converter, etc.
· Multi‑parameter measurement – Insulation resistance, true RMS voltage, frequency, leakage capacitance
· History memory – 1023 alarm messages with date/time stamp (real‑time clock, 3‑day buffer)
· Communication interfaces – RS‑485 (BMS/Modbus RTU), Ethernet (Modbus TCP, web server)
Typical Applications
· Industrial IT systems
· Medical locations (operating theatres, ICUs)
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Data centres
· Marine and offshore applications
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