isoPV425-D4-4 is an insulation monitoring device designed for unearthed systems (IT systems), particularly for photovoltaic applications. It continuously monitors the insulation resistance of unearthed main circuits with a rated voltage range of 3(N)AC, AC 0…690 V or DC 0…1000 V. The device is powered by an independent external supply voltage, allowing de‑energised systems to be monitored as well.
This device must be used together with the Bender AGH420 coupling device.
Technical Specifications
· Rated system voltage (Uₙ): 3(N)AC, AC 0…690 V; DC 0…1000 V
· Supply voltage (Uₛ): AC 100…240 V (47…63 Hz); DC 24…240 V
· Response values (Rₐₙ₁ / Rₐₙ₂): Two separately adjustable ranges, 1…500 kΩ (pre‑warning / main alarm)
· Response time (tₐₙ): ≤ 10 s (at R_F = 0.5 × Rₐₙ, Cₑ = 1 μF, according to IEC 61557‑8)
· Max. permissible system leakage capacitance (Cₑ): ≤ 1000 μF (self‑adapting)
· Measuring voltage (Uₘ): ±45 V
· Max. measuring current (Iₘ): ≤ 400 μA
· Power consumption: ≤ 9 VA
· Alarm outputs: Two independent changeover contacts (K1, K2), AC 250 V / 5 A
· Display: Multi‑function LCD display
· Communication interface: RS‑485, supporting BMS, Modbus RTU and isoData protocols
· Protection class: Internal components IP30, terminals IP20
· Mounting: 35 mm DIN rail
· Operating temperature: –40 °C … +70 °C
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8
· Order numbers: B71036303 (push‑wire terminals); B91036303 (screw‑type terminals)
Key Features
· Insulation monitoring: Reliably monitors unearthed AC, DC and mixed AC/DC IT systems, including those with galvanically connected inverters or frequency converters
· System voltage measurement: True RMS voltage measurement with undervoltage and overvoltage detection
· DC residual voltage measurement: Measures L1/+ and L2/‑ to earth voltages
· Self‑adapting to system leakage capacitance: Automatically adapts up to 1000 μF
· Dual alarm relays: Configurable as pre‑warning (AL1) and main alarm (AL2); N/O or N/C selectable
· Adjustable time delays: Start‑up delay (0…10 s), response delay (0…99 s), release delay (0…99 s)
· Fault memory: Selectable latching mode
· LCD display: High‑contrast multi‑function display showing insulation resistance, system voltage and leakage capacitance
· RS‑485 communication: Galvanically isolated, supports BMS, Modbus RTU and isoData protocols
· Password protection: Prevents unauthorised parameter changes
· Self‑test and connection monitoring: Automatic device self‑test with continuous monitoring of system and earth connections
Typical Applications
· Photovoltaic (PV) systems: Directly connected to inverters
· AC, DC or mixed AC/DC unearthed main circuits
· Systems with high system leakage capacitance: Large‑scale PV plants, long cable runs
· Installations with switch‑mode power supplies
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