AGH420 Bender insulation monitoring device

Description

AGH420 Bender insulation monitoring device

Product Dimensions：

The AGH420 is a coupling device designed for use with Bender ISOMETER® series devices, specifically the isoEV425, isoPV425, and isoCHA425HV. It enables these insulation monitoring devices to be connected to and monitor unearthed AC/DC systems (IT systems) with nominal voltages ranging from AC/DC 0-690V to DC 0-1000V. The coupling device ensures proper connection and extends the application range of the ISOMETER®.

Product Parameters

The specific parameters can vary slightly depending on the ISOMETER® it is paired with. However, some general parameters for the AGH420 include:

• Nominal System Voltage (Un) with compatible ISOMETER®:
  • 3(N)AC, AC: 0…690 V
  • DC: 0…1000 V
  • AC/DC (UL508): 0…600 V
• Supply Voltage (Us): AC 100…240 V / DC 24…240 V
• Frequency Range (Us): 47…63 Hz
• Permissible Extraneous DC Voltage (Ufg): ≤ 1150 V
• Interface: RS-485 (BMS, Modbus RTU, isoData)
• Dimensions: Typically a 2-module enclosure (36 mm width) for DIN rail mounting.
• Connections: Screw terminals for supply voltage, IT system, ISOMETER®, and external test/reset button.

Product Advantages

• Extends the Application Range: Allows compatible ISOMETER® devices to monitor a wider range of AC and DC systems.
• Enables Monitoring of De-energized Systems: With a separate supply voltage, it can monitor systems even when they are switched off.
• Compact Design: The 2-module enclosure saves space in the electrical cabinet.
• Flexible Installation: Can be mounted in various positions and connected to the ISOMETER® with a 4-wire connection.
• Cost-Effective: Provides a flexible and economical solution for insulation monitoring.
• Reliable Signalling: Ensures that insulation faults are reliably detected and reported according to standards when used with a compatible ISOMETER®.

Precautions

• Danger of Electric Shock: The AGH420 operates with voltages up to 1000 V. Ensure the system is de-energized before installation or working on connections. Follow safety regulations for working on electrical installations.
• Proper Combination: The AGH420 must always be used with the specific ISOMETER® series (isoxx425…) as intended by the manufacturer. AGH420 and AGH420-1 are not interchangeable.
• Hot Surfaces: If operated at mains voltages > 800 V, the enclosure temperature may exceed 60 °C. Avoid touching the device surface after switching on the power.
• Wiring: Use appropriate wiring and ensure correct connections as per the wiring diagram. For UL applications, use only 60/75°C copper wires and fuses rated over 5 A for supply voltage protection.
• Mains Internal Resistance: To ensure correct functioning with isoEV425, a mains internal resistance of ≤ 1 kΩ must exist between L1/+ and L2/- via the source or load.
• UL Compliance: If isoEV425 is used according to UL2231, the automatic self-test must be disabled, and a manual self-test must be performed.

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