| AUX | 230 Vac |
|---|---|
| OUTPUT | 1 relay with SPDT contact |
| THRESHOLDS | 20…200 kohm |
| FORMAT | 4 DIN modules |
| INPUT | 24...400 Vac |
| TYPE | Insulation monitor for IT distribution system |
 Datasheet
|
| AUX | 230 Vac |
|---|---|
| OUTPUT | 1 relay with SPDT contact |
| THRESHOLDS | 20…200 kohm |
| FORMAT | 4 DIN modules |
| INPUT | 100...160 Vdc |
| TYPE | Insulation monitor for direct current network |
|
Datasheet
|
| AUX | 230 Vac |
|---|---|
| OUTPUT | 1 relay with SPST-NO contact (insulation alarm) + 1 relay with SPST-NO contact (temperature or maximum demand alarm) |
| THRESHOLDS | 50…500 kohm |
| FORMAT | 4 DIN modules |
| INPUT | 230 V |
| TYPE | Insulation monitoring for use in medical environment line 230 V |
|
Datasheet
|
- Connection: insulation transformer Iso TV (NT699)
- Network voltage: 230V
- Rated frequency: 50Hz
- Working frequency: 47...63Hz
- Insulation measuring circuit current: ≤ 100µA
- External VT temperature: Pt100 2-wire resistance bulb
- Current: connection by CT/5A
- Rated burden input current: ≤ 0,5VA
- Input impedance: > 100kΩ
- Measuring voltage: < 15V
- Display type: LCD
- Digit height: 5mm (2 lines x 8 digit)
- Measurement display2
- : subdivided on 7 pages
- resistance or impedance towards ground + insulation TV temperature
- resistance towards ground1+ capacity towards ground1
- voltage + frequency
- current
- active power + apparent power
- apparent power demand + apparent power max. demand
- phase with lowest impedance towards ground + presence of remote repeaters
- 1 present just if you select the impedance towards ground display
- 2 measurements referred to the secondary winding of the external insulation VT
- Insulation pre-alarm: blinking yellow LED
- Insulation alarm: On yellow LED
- Temperature and / or power pre-alarm: blinking yellow LED
- Temperature and / or power alarm: On yellow LED
- no measuring voltage
- connection breakdown to the equipotential junction
| Datasheet |
- Used in connection with Iso D4-Z (NT688)
- insulation monitor for a continuous control ofthe insulation towards ground
- Primary voltage 230V
- Secondary voltage 230V
- Rated output 1,5 – 3 – 5 – 7,5 – 10kVA
- According to EN/IEC 61558-2-15: “Particular requirements for isolatingtransformers for the supply of medical locations” Sensor to detect the temperature (Pt100 resistance bulb)
| Datasheet |
Insulation Monitoring Relays
An insulation monitoring relay monitors the insulation integrity of a power supply or installation — especially in IT-networks, unearthed systems, or isolated supply circuits. It continuously checks insulation resistance or leakage currents relative to earth or reference ground, and detects insulation faults early. If a predefined threshold is crossed, the relay triggers a signal or protective action (alarm, shutdown, etc.). These modules are typically DIN-rail mountable for straightforward integration into existing switchgear or distribution systems.
Questions & Answers on Insulation Monitoring Relays
What is an insulation monitoring relay?
A device that monitors the insulation resistance or leakage current of a supply circuit and triggers an alert or output when insulation degrades or a fault occurs.
Where are such relays used?
In IT-power networks, critical systems, medical facilities, industrial equipment — wherever insulation integrity and early fault detection are essential.
How does the monitoring work?
The relay measures insulation resistance or leakage current relative to earth/reference. If resistance drops below or leakage exceeds a set threshold, the relay signals a fault.
What kind of output does it provide?
Typically a relay contact or switch output that can be connected to control, alarm, or shutdown circuits.
Is galvanic isolation part of the design?
Yes — input (power circuit) and output (signal) are galvanically separated to avoid interference, ground loops or unintended current paths, ensuring safety and reliability.
How is the device installed?
It is mounted on a DIN rail and wired to the power supply conductors; the output is connected to alarm or monitoring systems.
In which applications are insulation monitoring relays particularly useful?
In isolated or unearthed supply systems (IT-networks), safety-critical installations, industrial plants, building services, medical or lab installations — wherever insulation faults must be detected early.
What are the main benefits?
Early detection of insulation faults, enhanced safety, protection against earth faults or leak currents, easy retrofitting, and reliable signaling for fault handling.
What do you need to watch out for?
Correct wiring and adherence to specifications are essential. Regular testing and maintenance is recommended to ensure continued effectiveness; incorrect installation may render the protection ineffective.