Product Description
Bender ISOPV425-D4-4
The Bender ISOPV425-D4-4 is an advanced insulation monitoring device specifically designed for unearthed DC power systems (IT systems), particularly in photovoltaic (PV) applications. It continuously monitors the insulation resistance of the system, providing reliable detection of insulation faults. This device is crucial for ensuring the operational safety and availability of solar power plants by promptly signaling any degradation in insulation. Featuring two separately adjustable response values, an LC display for clear visualization of measured values, and a history memory function, the ISOPV425-D4-4 offers comprehensive monitoring and diagnostics for PV systems up to DC 1000 V.
Technical Specifications:
- Nominal system voltage (U_n): DC 0…1000 V
- Supply voltage (U_s): AC 100…240 V, 50/60 Hz; DC 100…240 V
- Response value range (R_an1/R_an2): 1 kΩ…10 MΩ
- Operating temperature: -40 °C … +70 °C (-40 °F … +158 °F)
- Standards compliance: IEC 61557-8
- Mounting: DIN rail mounting
- Display: High-contrast LC display

Bender ISOPV425-D4-4
The Bender ISOPV425-D4-4 is a high-performance insulation monitoring device for photovoltaic (PV) systems, providing continuous insulation fault detection in unearthed DC IT systems up to 1000V to ensure maximum safety and system uptime.






