2CSM244000R1501 ABB ISOLTESTER-DIG-RZ Insulation Monitor

Why Choose the ABB ISOLTESTER-DIG-RZ Insulation Monitor?

The ABB ISOLTESTER-DIG-RZ is a digital insulation monitoring device designed for permanent supervision of insulated IT-M electrical networks in medical locations. As part of the ABB H+Line ISOLTESTER range, it continuously monitors insulation resistance to earth while helping maintain continuity of supply following a first insulation fault in critical medical electrical installations.

The ISOLTESTER-DIG-RZ provides real-time insulation monitoring across a 0–999 kΩ measuring range, with a programmable low-insulation alarm threshold from 50–500 kΩ. Its three-digit digital display clearly indicates insulation resistance and fault conditions, while integrated Link-Fail diagnostics monitor the connection between the device and supervised network.

Designed for 115–230 V AC, 50/60 Hz auxiliary supply and monitoring insulated networks from 24–230 V AC, the ISOLTESTER-DIG-RZ also supports transformer temperature and load-current supervision. Its compact 6-module DIN-rail format and compatibility with ABB QSD-DIG remote signalling panels make it well suited to medical IT systems in operating theatres and other Group 2 medical locations.

Key Advantages

• Continuous insulation monitoring for medical IT-M networks.
• Wide 0–999 kΩ insulation resistance measuring range.
• Programmable 50–500 kΩ low-insulation alarm threshold.
• Digital display provides clear real-time insulation resistance indication.
• Monitors transformer temperature and electrical overload in addition to insulation condition.
• Integrated Link-Fail self-diagnostic monitoring identifies loss of connection to the supervised line.
• Compatible with up to four ABB QSD-DIG remote signalling panels.
• Compact 6-module DIN-rail mounting for medical distribution boards.
• Designed in accordance with standards including EN 61557-8 and IEC 60364-7-710.

Key Features

• ABB H+Line ISOLTESTER-DIG series.
• 115–230 V AC auxiliary supply.
• 50/60 Hz rated supply frequency.
• Suitable for monitored networks from 24–230 V AC.
• 0–999 kΩ / HIGH insulation measurement with 1 kΩ resolution.
• 50–500 kΩ adjustable low-insulation threshold.
• Insulation measurement threshold accuracy of 5% with 5% hysteresis.
• PT100 temperature measurement from 0–250 °C.
• External CT current measurement with 5 A secondary and selectable CT ratio from 1–200.
• Current overload threshold adjustable from 1–999 A.
• Impedance measurement from 0–999 kΩ / HIGH.
• Programmable NO-C-NC auxiliary relay output rated 5 A at 250 V AC.

Continuous Insulation Monitoring for Medical IT Networks

Medical IT electrical systems use an isolating transformer so that a first fault to earth does not immediately interrupt the power supply to critical medical equipment. The ABB ISOLTESTER-DIG-RZ continuously supervises the insulation resistance of the isolated network and generates an alarm when the measured value falls below the configured threshold, allowing personnel to identify a developing insulation fault while continuity of service is maintained.

In addition to insulation resistance, the ISOLTESTER-DIG-RZ can supervise isolating-transformer temperature and electrical loading. Integrated self-diagnostics, configurable alarm thresholds and remote signalling capability make it a comprehensive monitoring solution for medical electrical installations where both patient safety and continuity of supply are essential.

Typical Applications

• Medical IT-M electrical distribution systems.
• Group 2 medical locations.
• Operating theatres and surgical rooms.
• Hospital medical distribution boards.
• Insulated power systems supplied by medical isolating transformers.
• Critical medical electrical installations requiring continuity of supply.
• Medical systems requiring insulation, transformer temperature and overload monitoring.
• Installations using ABB QSD-DIG remote alarm and signalling panels.