2CSM808000R1500 ABB ISL-MOT 1000 Insulation Monitor

Why Choose the ABB ISL-MOT 1000 Insulation Monitor?

The ABB ISL-MOT 1000 is an industrial insulation monitoring device designed for continuous supervision of de-energised or voltage-free electrical circuits. As part of the ABB ISL insulation monitoring range, it continuously monitors insulation resistance between the supervised circuit and earth, helping identify insulation deterioration before the circuit is required to operate.

The ISL-MOT 1000 is particularly suited to standby and safety circuits where dependable operation is essential despite long periods without voltage. Typical examples include alarm systems, fire-protection circuits and pumps. Its programmable 0.1–10 MΩ trip threshold, low-insulation LED indication and changeover relay output allow insulation deterioration to be detected and signalled to external equipment.

Designed to supervise voltage-free networks rated from 20–700 V AC/DC, the ISL-MOT 1000 uses a 220–240 V AC auxiliary supply and offers a maximum trip delay of 0.2 seconds. Its compact 3-module DIN-rail format, TEST function and selectable fail-safe operation make it a practical monitoring solution for critical industrial electrical circuits.

Key Advantages

• Continuous insulation monitoring of voltage-free electrical circuits.
• Suitable for networks rated from 20–700 V AC/DC.
• Programmable 0.1–10 MΩ insulation trip threshold with eight selectable levels.
• Fast response with a maximum trip delay of 0.2 seconds.
• Fail-safe setting provides configurable relay behaviour.
• Front-mounted TEST pushbutton enables functional verification.
• LED indication provides clear operating and low-insulation status.
• Changeover relay output supports remote signalling or load switching.
• Compact 3-module DIN-rail design simplifies installation in control panels.

Key Features

• ABB ISL-MOT 1000 industrial insulation monitor.
• Designed specifically for voltage-free networks.
• 20–700 V AC/DC monitored network range.
• 220–240 V AC auxiliary power supply.
• 50/60 Hz auxiliary supply frequency.
• 0.1–10 MΩ trip threshold across eight selectable levels.
• 0.2 second maximum trip delay.
• 0.0015 mA maximum measuring current.
• 20 V maximum measuring voltage.
• Internal impedance of 1000 kΩ AC / 1500 kΩ DC.
• 1 NO-C-NC changeover trip relay rated up to 5 A at 250 V.
• IP40 front / IP20 enclosure protection.

Reliable Monitoring for Voltage-Free Critical Circuits

Electrical circuits that remain de-energised for long periods can develop insulation deterioration without the fault becoming apparent during normal operation. The ABB ISL-MOT 1000 continuously supervises insulation between the monitored line and earth so that deterioration can be identified before the circuit is called upon to operate.

When insulation resistance falls below the selected threshold, the ISL-MOT 1000 provides a visual low-insulation indication and operates its changeover relay contact. This makes the device particularly valuable for standby, emergency and safety systems where reliable operation is required immediately after energisation.

Typical Applications

• Voltage-free industrial electrical circuits.
• Alarm and emergency signalling systems.
• Fire-protection and fire-fighting systems.
• Standby pump circuits.
• Emergency and safety equipment.
• Industrial control and automation panels.
• Circuits that remain de-energised for extended periods.
• Critical installations requiring preventative insulation monitoring.