The SIM200 Insulation Monitoring Device (IMD) is built for continuous, active monitoring of unearthed (Isolated Terra) DC systems—ideal for applications like charging stations, electric vehicles, and any system operating above 60 VDC.
Recognized under UL2231, the SIM200 Module meets high safety standards and delivers fast, reliable detection of electrical hazards. It uses a patented signal injection algorithm to ensure continuous, real-time (“Always On”) insulation monitoring.
The SIM200 also features robust self-diagnostics to continuously verify monitoring performance, a modular CAN 2.0B interface for detailed system data, a configurable warning alarm, a fault alarm triggered at 100 Ω/V, and flexible CAN ID settings to support system integration.
Industries
Features
Safety
- Continuous, “always-on” system monitoring of insulation
- Digital out to indicate internal IMD error
- Dedicated fault state output (1x digital out, 1x PWM)
- Stored capacitive energy monitoring
Usability
- Configurable CAN ID
- Fault alarm at 100 Ω/V
- Warning alarm with configurable level
Performance
- Modular CAN 2.0B interface
- Strong self-diagnosis of monitoring capabilities
Specifications
Power and General Characteristics. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Operational supply voltage |
9 |
12-24 |
30 |
V |
|
| Operational supply current |
- |
60
28
|
- |
mA |
12 V supply
24 V supply |
| Operating temperature range |
-40 |
|
+85 |
°C |
|
| Input impedance rin |
- |
2720
2720
1000
272 |
- |
kΩ |
xNx
xKx
xPx
xQx |
Input impedance varies based on the device voltage configuration (hardware configured). The input impedance of the monitor is the parallel impedance imposed by the SIM200 between each rail and the chassis. See “Part Numbering” for more information. |
Isolation Monitoring Function. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Time to initial isolation estimate |
- |
4.5 |
5.5 |
Seconds |
|
| Response time to warning condition |
4.3 |
- |
5 |
Seconds |
Applies to the detection of warning (500 Ω/V) condition from a stable initial state under typical operating conditions. |
| Response time to sault condition |
- |
5.3 |
5.8 |
Seconds |
Applies to the detection of fault (100 Ω/V) condition from a stable initial state under typical operating conditions. |
| Response time to short condition |
- |
- |
6.5 |
Seconds |
Time needed to confirm short condition, for equivalent resistances for each variant see “Reporting of Short Condition”. |
| Application voltage range (Vb) |
1000
600
300
60 |
1363
1000
510
140 |
1568
1150
582
161 |
V |
xNx
xKx
xPx
xQx |
“Typical” value is the max nominal system voltage to meet IEC 61557-8 and allow for operation at 115% of nominal. |
| Total Y-capacitance |
0.2
0.2
0.4
2 |
1.2
1.2
4.2
6.2 |
4.2
4.2
14.2
14.2 |
uF |
xNx
xKx
xPx
xQx |
See “Y-Capacitors” section for more information.
If higher Y-capacitance is desired, contact Sensata for further discussion. |
Isolation Resistance Measurements. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Reporting range |
0 |
- |
2720
2720
1000
272 |
kΩ |
xNx
xKx
xPx
xQx |
The SIM200 provides the total resistance value for each HV rail, including that imposed by the SIM200 module itself, which is the upper bound for system insulation. |
| Measurement resolution |
- |
1 |
- |
kΩ |
|
| Measurement accuracy |
- |
±5
±5
±5
±3 |
±15
±15
±15
±5 |
% |
Listed accuracies are achieved when system isolation is stable and under typical operating conditions. |
| Measurement update period |
- |
250 |
- |
ms |
|
| Reporting of short condition |
- |
8
8
1.5
0.4 |
- |
kΩ |
Nx
xKx
xPx
xQx |
Short condition will be reported when the isolation resistance of one of the High Voltage rail falls below the listed value. |
| Reporting of short condition - low voltage mode |
- |
16
16
3
0.8 |
- |
kΩ |
xNx
xKx
xPx
xQx |
Low voltage mode when battery voltage < 15 V. |
Capacitance Measurement. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Total Capacitance Measurement |
|
|
|
|
|
| Reporting range |
0.2 |
1 |
- |
μF |
The total capacitance of the system is defined as the sum of all Y-capacitance in the system. |
| Measurement resolution |
- |
1 |
- |
nF |
|
| Measurement accuracy |
- |
±10 |
- |
% |
Typical accuracy is achieved when the system time constant is between 0.5 s and 1.5 s and under typical operating conditions, and capacitive measurement uncertainty is reported <10% confidence interval. |
| Measurement update period |
- |
250 |
- |
ms |
|
Noise Immunity of Measurements. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Common mode voltage on the battery terminals |
20 |
- |
- |
VPK-PK |
No observable effect on isolation resistance value; measured with square, ramp, and sine wave test signals from 1 kHz to 100 kHz.
Common mode noise below 1 kHz expected to interfere with isolation resistance measurement. |
| Differential mode voltage on the battery terminals (battery voltage variations) |
- |
100 |
- |
VPK-PK |
No observable effect on isolation resistance value; Tested with battery-voltage driving profile that has multiple instantaneous voltage changes up to ±100 V and overall slow battery voltage fluctuation from 910 V to 480 V. |
Voltage Measurements. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Measurement range |
±1627
±1168
±599
±164 |
±1652
±1186
±608
±167 |
- |
V |
xNx
xKx
xPx
xQx |
Applies to HV rail measurements with respect to chassis. |
| Offset error |
-100 |
±50 |
+100 |
mV |
Over operating temperature range. |
| Gain error |
-2 |
±0.5 |
+2 |
% |
Over operating temperature range. |
| Measurement resolution (compact reporting) |
- |
1 |
- |
V |
|
| Measurement resolution (high-resolution reporting) |
- |
100 |
- |
μV |
|
| Measurement update period |
- |
10 |
- |
ms |
|
Temperature Measurement. Source: Sensata Technologies, Inc.
| Parameter |
Min |
Typical |
Max |
Unit |
Conditions / comments |
| Absolute measurement error |
-5 |
±0.5 |
+5 |
°C |
Over operating temperature range. |
| Measurement resolution |
- |
10 |
- |
m°C |
|
| Measurement update period |
- |
250 |
- |
ms |
|
Communication and Connectors. Source: Sensata Technologies, Inc.
| Parameter |
Spec |
Speed |
Termination |
| CAN Communication |
2.0B |
500 or 250 kbit/s |
120 Ω termination resistor (optional) |
Connectors. Source: Sensata Technologies, Inc.
| Parameter |
Manufacturer |
Position |
Part number |
Description |
| COM & power on board |
Molex |
6 |
705510040 |
P1: 6 pos. right angle single header, shrouded connector (2.54 mm) through hole tin. |
| COM & power mating connector |
Molex |
6 |
50579406 |
Use appropriate crimp contacts (available for
AWG 22, 24 and 26). |
| Voltage sensing on board |
Molex |
2 |
705510036 |
J1, J3, J4: MINIFIT JR HDR 02P 94V-0 30AU |
| Voltage sensing mating connector |
Molex |
2 |
50579402 |
MINIFIT JR RCPT DR SIDETABS 2 CKT 94V-0. Crimp contacts available for AWG 22 |