Why Choose the ABB ISL-C 230 Insulation Monitor?
The ABB ISL-C 230 is an industrial insulation monitoring device for unearthed IT AC networks, designed to continuously supervise insulation resistance between the electrical system and earth. As part of ABB’s Earth Monitoring Devices range, it helps identify the first insulation fault while allowing an IT network to continue operating so the cause can be investigated and corrected.
Designed for 220–240 V AC networks, the ISL-C 230 monitors insulation by applying a DC measuring signal between the isolated network and earth. When the insulation resistance falls below its fixed 100 kΩ threshold, the monitor provides local indication and operates its changeover relay contact for remote signalling.
The ISL-C 230 combines straightforward operation with a compact three-module DIN-rail format. A green ON indicator confirms that the device is operating, a TRIP indicator identifies a low-insulation condition, and a front-mounted TEST button allows the monitoring function to be checked during commissioning and maintenance.
Key Advantages
- Continuous insulation monitoring for unearthed IT AC networks.
- Designed for 220–240 V AC monitored networks.
- Fixed 100 kΩ insulation threshold provides straightforward fault monitoring.
- Changeover relay contact enables remote low-insulation signalling.
- Front-mounted TEST control and status indicators simplify functional checks and fault identification.
- Compact three-module DIN-rail construction supports easy integration into industrial electrical panels.
Key Features
- ABB ISL industrial insulation monitoring series.
- Designed specifically for isolated IT AC networks.
- 220–240 V AC rated operational voltage.
- 230 V AC control supply at 50/60 Hz.
- Fixed 100 kΩ trip threshold.
- Insulation measurement using a DC measuring signal between the isolated network and earth.
- Green ON indicator for operating status.
- TRIP indication for low-insulation conditions.
- Front-mounted TEST pushbutton.
- Changeover relay contact for remote low-insulation signalling.
- Sealable transparent front protection cover.
- 35 mm DIN-rail mounting.
- Compact three-module width.
Continuous Insulation Monitoring for 230 V AC IT Networks
In an unearthed IT electrical network, a first earth fault does not necessarily require the supply to be interrupted immediately. Continuous insulation monitoring is therefore important for identifying deterioration before a subsequent fault can create a more serious electrical or operational problem. The ABB ISL-C 230 continuously supervises the insulation level of 220–240 V AC IT networks by applying a DC measuring signal between the isolated network and earth.
When insulation resistance falls below the 100 kΩ fixed threshold, the ISL-C 230 provides a local low-insulation indication and operates its changeover relay contact so the condition can also be signalled remotely. The TEST pushbutton allows the monitoring function to be checked, while the compact DIN-rail construction makes the device suitable for integration into industrial switchboards and control panels where continuity of supply is important.
Typical Applications
- Unearthed 220–240 V AC IT networks.
- Industrial low-voltage distribution systems.
- Electrical switchboards and distribution panels.
- Industrial machinery and automation systems.
- Control systems where continuity of electrical supply is important.
- Installations requiring continuous insulation-to-earth supervision.
