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Uncompromising Safety: Advanced DC Insulation Monitoring Device for High-Voltage IT Systems
Instrava curated instruments presents an advanced solution for continuous insulation monitoring in unearthed (IT) DC systems, engineered to meet the rigorous demands of modern electrical infrastructure. Supporting a wide voltage range from DC 100V to 1000V, this device serves as a critical safety barrier for high-voltage environments. By selecting only proven, high-performance technology, Instrava ensures your operations are protected by a device that offers real-time measurement of both positive and negative pole insulation resistance. Whether in EV charging or industrial power distribution, this curated instrument provides the reliability and confidence required for mission-critical applications.
Power Monitoring & Control Description
Intelligent Fault Detection in Complex DC Environments
This DC insulation monitoring device is specifically designed to maintain absolute accuracy despite the inherent challenges of high-voltage networks. It provides a comprehensive view of system health, ensuring that even the slightest insulation degradation is captured before it escalates.
Adaptive Capacitance Technology: The device features automatic adaptation to system leakage capacitance up to 5μF. This ensures stable measurements in large-scale systems where capacitive interference often compromises standard monitoring equipment.
Symmetrical & Asymmetrical Monitoring: It delivers precise real-time data for both poles, maintaining accuracy regardless of DC voltage fluctuations or asymmetry. This makes it an ideal choice for EV/HEV DC charging systems and rail transit networks.
Rapid Fault Response: With a first-reading update time as fast as 0.7s, the system allows for near-instantaneous detection of ground faults, significantly reducing the risk of equipment damage or hazardous leakage currents.
Seamless Digitalization and Versatile Industrial Control
Aligned with the Instrava mission to bridge the gap between legacy hardware and data-driven systems, this device offers sophisticated integration capabilities that simplify remote maintenance and system management.
Remote Monitoring & Connectivity: Equipped with an RS485 interface and Modbus RTU protocol, the device allows for seamless integration into SCADA or building management systems. This enables centralized monitoring of insulation resistance and system status in real-time.
Customizable Security & Alerts: Users can configure up to 8 types of alarms with a widely adjustable response range (1kΩ to 10MΩ). To ensure system integrity, password protection prevents unauthorized modification of critical safety parameters.
Rugged Industrial Design: Built to withstand extreme conditions, it operates reliably in temperatures ranging from -40°C to +75°C. The multifunctional LCD provides immediate on-site visibility of insulation values and voltage, while the standard 35mm DIN rail mounting ensures a quick and efficient installation process.
Power Monitoring & Control Parameter
| Parameter | Value | ||
| Power supply | 10-30VDC, Power 3W | ||
| DC voltage range | 100V~1000V | ||
| DC voltage measurement accuracy | ≤2V+0.3% | ||
| Insulation resistance measurement range | 1KΩ~10MΩ (DC system voltage:100V~1000V) | ||
| Max system leakage capacitance | 0-5μF | ||
| Insulation monitoring accuracy ((When: DC voltage:100V-1000V) | CY range | Resistance range | Accuracy |
| 0~0.8μF | ≤60kΩ | ≤3kΩ | |
| 60kΩ<R<1MΩ | ≤5% | ||
| 0.8μF ~3μF | ≤60kΩ | ≤6kΩ | |
| 60kΩ<R<1MΩ | ≤20% | ||
| Insulation resistance value update time after turning on | After insulation monitoring is turned on, the time until the effective resistance value can be read for the first time | 0.7s~2s | |
| Insulation resistance value update time | Switch the insulation resistance until the module can read the switched insulation resistance value. | 0.5s~3s | |
| Insulation monitoring function switching times | 50*105 times | ||
| Off-line withstand voltage test | <2mA | ||
| Digital output (DO) | 1*DO, passive dry contact, SPST Load capacity: 4A@250Vac, 4A@30Vdc | ||
| Digital input (DI) | 2*DI, 0.25mA@short circuit | ||
| Communication | RS485/ Modbus RTU | ||
| Standard | IEC 61557-1: 2018; IEC 61557-8: 2018 | ||
| Dimension | Standard 35 mm DIN rail mounting Dimensions (W × H × D): 72 × 110 × 66 mm | ||
| Storage temperature | -55°C~90°C; ≤90%RH (non-condensing, non-corrosive), Altitude: ≤3500 m | ||
| Operating temperature | -40°C~75°C; ≤90%RH (non-condensing, non-corrosive), Altitude: ≤3500 m | ||
Withstand voltage test
| Voltage injection point | Maximum voltage rating | Time |
| DC+/DC- to GND | 4200VDC/3000VAC | ≤1min |
| Power supply +/- to GND | 3500VDC/2500VAC | ≤1min |
| RS485 A/B to GND | 3500VDC/2500VAC | ≤1min |
| DC+/DC- to Power supply +/- | 4200VDC/3000VAC | ≤1min |
| DC+/DC- to A/B | 4200VDC/3000VAC | ≤1min |
Instrava OEM/ODM
Reliable Instruments. Solutions That Fit Your Application.
Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven instruments from trusted manufacturers to ensure consistent quality, optimize solutions based on real working conditions to solve practical challenges, and provide tailored configurations to meet specific application needs.
By combining selection expertise with application understanding, Instrava helps customers reduce risk, improve efficiency, and achieve dependable results in complex industrial environments.
Instrava design the right path to digitalize your operations — from legacy instruments to connected, data-driven systems.
Why is an insulation monitoring device essential for 1000V IT (unearthed) systems?
In an unearthed (IT) system, a single ground fault doesn’t typically trigger a fuse or circuit breaker, allowing the system to continue running. However, this “first fault” creates a significant safety risk and potential for a catastrophic second fault. This device provides the real-time visibility needed to detect that first fault, ensuring you can perform maintenance before a hazardous failure or unplanned shutdown occurs.
How does the device handle high system leakage capacitance?
Large DC networks, especially in EV charging and renewable energy, often suffer from high leakage capacitance which can “trick” standard monitors into giving false readings. This curated instrument features automatic capacitance adaptation up to 5μF. It intelligently filters out capacitive interference to ensure the resistance measurement reflects the actual state of the insulation.
Does the device remain accurate if the DC voltage is unstable?
Yes. A standout feature of this monitoring solution is its immunity to voltage fluctuations. Whether the system is experiencing pole asymmetry or rapid voltage swings (common in EV/HEV charging cycles), the internal measuring principle ensures that the insulation resistance values for both positive and negative poles remain precise and reliable.
Can I integrate this device into my existing SCADA or Building Management System?
Absolutely. True to the Instrava mission of digitalizing operations, the device is equipped with an RS485 interface using the Modbus RTU protocol. This allows for seamless remote data acquisition, enabling you to track insulation trends, log alarms, and monitor system voltage from a centralized control room.
What happens if an unauthorized person tries to change the safety settings?
Security is built into the firmware. To protect your critical infrastructure, the device includes password protection for all parameter configurations. This ensures that only authorized personnel can modify alarm thresholds (1kΩ to 10MΩ) or reset modes, preventing accidental or malicious interference with system safety.
Is this device suitable for extreme outdoor environments or high-altitude sites?
Yes, it is built for rugged industrial use. It operates efficiently in a wide temperature range from -40°C to +75°C and is rated for altitudes up to 3500 meters. This makes it an ideal choice for remote solar farms, rail transit power systems, and outdoor EV charging hubs where environmental conditions are often harsh.
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Why Choose Instrava
Built on Consistency, Not Claims
Focused on Industrial Applications
We specialize in industrial analysis and detection, with a clear understanding of real-world operating environments and requirements.
Strict Product Selection Criteria
Every instrument is evaluated based on performance, stability, and application suitability—not just specifications or pricing.
Reliable Supply & Quality Consistency
We work with trusted manufacturers to ensure stable supply, consistent quality, and dependable delivery.
Practical, Experience-Based Support
Our recommendations are grounded in application understanding, helping customers avoid common issues and achieve reliable results.
Instrava is built to reduce uncertainty—so every decision you make is clearer, safer, and more reliable.
