Find the Right DC EV Charger Insulation Monitor
One Charger. One Requirement. One Recommended Solution.
| Your Charging System | Recommended Solution | Key Function |
|---|---|---|
| Single DC charging circuit | AIM-D100-CA | Insulation + voltage monitoring |
| Dual-gun DC charger | AIM-D100-CAD | 2-channel independent monitoring |
| Charger requiring current measurement | AIM-D200-CAI | Insulation + voltage + current |
| CCS / CHAdeMO charging system | AIM-D500-CA + ACPD300 | International-standard DC insulation monitoring |
Not sure which model you need?
Send us your charger voltage, number of outputs and charging standard.
Why DC EV Chargers Need Insulation Monitoring?
DC fast charging systems operate with high DC voltage. If insulation between DC+ / DC− and PE deteriorates, the fault may affect electrical safety, charging reliability and equipment operation.
Typical causes include:
- Cable or connector insulation deterioration
- Moisture or water ingress
- Damaged insulation
- Aging charging components
- Environmental contamination
- Insulation faults in the DC output circuit
For an ungrounded DC system, insulation monitoring provides an additional layer of protection by continuously or periodically evaluating the insulation condition between the DC conductors and ground.
Acrel’s DC insulation monitoring devices are designed specifically for 100–1000 V DC EV charging applications, with different models for different charger architectures.
How the Solution Works？
Typical DC EV Charging Insulation Monitoring Architecture
The monitoring device detects insulation conditions between the DC system and PE. When the insulation resistance falls below the configured threshold, the device provides warning or alarm information.
Four Solutions for Different DC Charging Systems
01. Single-Circuit DC EV Charger Insulation Monitoring
Designed for single-output DC charging systems
Key Functions
- DC insulation resistance monitoring
- DC voltage monitoring
- Positive-to-ground and negative-to-ground voltage monitoring
- Warning and alarm
- RS485 / Modbus-RTU communication
- DIN rail or wall-mounted installation
The insulation resistance measurement range is 1 kΩ–10 MΩ, with configurable warning and alarm ranges of 10 kΩ–10 MΩ.
Best for:
Single-output DC chargers
DC fast charging equipment
DC charging cabinets
02. Dual-Channel Insulation Monitoring for Dual-Gun DC Chargers
Designed for dual-gun DC EV charging equipment
Key Functions
- Two independent DC monitoring channels
- Independent insulation resistance monitoring
- Independent warning settings
- Independent alarm settings
- DC voltage monitoring
- RS485 / Modbus-RTU
- DIN rail or wall-mounted installation
Each channel monitors its corresponding DC system independently.
Why choose it?
One device. Two independent DC charging circuits.
Best for:
Dual-gun DC chargers
Two-output charging systems
Integrated DC charging cabinets
03. DC Insulation Monitoring with Current Measurement
Combines insulation monitoring, voltage monitoring and DC current measurement in one device.
Key Functions
- DC insulation resistance monitoring
- DC voltage monitoring
- DC current measurement
- Warning and alarm
- RS485 / Modbus-RTU communication
- DIN rail installation
The device measures DC current through a selected shunt and provides 0.5-class current measurement accuracy
Why choose it?
Monitor insulation and electrical current with one device.
Best for:
DC chargers requiring current measurement
Charging power monitoring
DC charging cabinets
Applications requiring electrical parameter monitoring
04. DC Insulation Monitoring for International-Standard Charging Systems
AIM-D500-CA uses a signal injection method and is designed for DC charging systems using CCS and CHAdeMO charging standards.
The solution can monitor DC systems up to 1000 V when used with ACPD300.
Key Functions:
- DC insulation resistance monitoring
DC voltage monitoring
Warning and alarm
RS485 / Modbus-RTU
DIN rail installation
Signal injection monitoring method
The AIM-D500-CA also supports alarm outputs and provides LCD/LED indication for monitoring and fault status.
Why choose it?
Designed for international DC charging applications where charging-standard compatibility matters.
Best for:
CCS charging systems
CHAdeMO charging systems
International DC fast chargers
DC EV charging equipment
Which Solution Fits Your DC EV Charger?
- Do you have one DC output?
→ AIM-D100-CA - Do you have two independent DC outputs?
→ AIM-D100-CAD - Do you also need DC current measurement?
→ AIM-D200-CAI - Do you need CCS or CHAdeMO compatibility?
→ AIM-D500-CA + ACPD300
Compare the Four Solutions
| Feature | AIM-D100-CA | AIM-D100-CAD | AIM-D200-CAI | AIM-D500-CA + ACPD300 |
|---|---|---|---|---|
| DC Insulation Monitoring | ✓ | ✓ | ✓ | ✓ |
| DC Voltage Monitoring | ✓ | ✓ | ✓ | ✓ |
| DC Current Measurement | — | — | ✓ | — |
| Independent Channels | 1 | 2 | 1 | 1 |
| DC Voltage | 100–1000 V | 100–1000 V | 100–1000 V | Up to 1000 V* |
| RS485 / Modbus-RTU | ✓ | ✓ | ✓ | ✓ |
| Single DC Charger | ✓ | — | ✓ | ✓ |
| Dual-Gun Charger | — | ✓ | — | — |
| CCS / CHAdeMO | — | — | — | ✓ |
| DIN Rail Installation | ✓ | ✓ | ✓ | ✓ |
What Does the Solution Monitor?
Insulation Resistance
Monitor the insulation resistance between:
DC+ → PE & DC− → PE
When the insulation resistance falls below the configured threshold, the device provides a warning or alarm.
DC Voltage
Monitor:
DC− / PE voltage
DC+ / DC− voltage
DC+ / PE voltage
DC Current
For applications requiring current measurement,
AIM-D200-CAI can measure DC current through a selected shunt.
Communication:
The monitoring devices support RS485 / Modbus-RTU communication for integration with an upper-level system, depending on model.
Designed for
Designed for DC EV Charging Safety
Detect insulation deterioration before it develops into a more serious fault.
Monitor insulation and electrical parameters rather than relying only on manual inspection.
Choose from single-channel, dual-channel, current-measurement and international-standard solutions.
RS485 / Modbus-RTU enables communication with the charging controller or monitoring system.
The devices are designed for installation inside charging cabinets and electrical enclosures.
Designed for Different EV Charging Applications
Monitor insulation condition in high-power DC charging equipment.
Independently monitor two DC charging circuits with AIM-D100-CAD.
Use AIM-D200-CAI when DC current measurement is also required.
Use AIM-D500-CA + ACPD300 for CCS and CHAdeMO charging applications.
Why Choose Acrel for DC EV Charging Insulation Monitoring?
- Dedicated DC Insulation Monitoring Products
The four configurations are designed around different DC charging requirements rather than forcing one model into every application. - Multiple Monitoring Methods
Acrel provides different monitoring approaches, including the unbalanced bridge method and signal injection method, depending on the product. - From Standard to Specialized Applications
One product family covers:
1. Single Circuit
2. Dual Circuit
3. Current Measurement
4. International Charging Standards
Need Help Selecting the Right Model?
Send us just 4 parameters:
- DC Voltage:
e.g. 800 V - Number of DC Outputs:
1 / 2 / Other - Charging Standard:
CCS / CHAdeMO / Other - Current Measurement:
Yes / No
[Get My Recommended Model]
Our engineers will recommend the suitable DC EV charging insulation monitoring solution for your application.
FAQ
It is the online monitoring of insulation resistance between the DC conductors and protective earth in an ungrounded DC charging system.
The AIM-D100-CA, AIM-D100-CAD and AIM-D200-CAI are designed for 100–1000 V DC charging applications.
AIM-D100-CAD provides two independent insulation monitoring channels specifically for dual-output DC charging equipment.
AIM-D200-CAI supports DC current measurement through a selected shunt.
AIM-D500-CA + ACPD300 is designed for international DC charging applications using CCS and CHAdeMO standards.
The relevant models support RS485 / Modbus-RTU communication for data exchange with an upper-level system.
Get the Right DC EV Charging Insulation Monitoring Solution
Single charger or dual-gun?
Need current measurement?
CCS or CHAdeMO?
Acrel has a suitable configuration for your application.
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Send your charger specifications → Get a model recommendation → Receive technical support
