Application
BDU & BJB/PDU
The Battery Disconnect Unit (BDU) and the Battery Junction Box (BJB) or Power Distribution Unit (PDU) are important components for supplying power to the battery of an electric vehicle. With their high accuracy, our precision measurement sensors are specially designed to improve the efficiency of BDUs, BJBs and PDUs.

Switch components for battery management
BDUs and BJB/PDUs act as primary on/off switches for the battery and adapt to the vehicle's operating mode, both when charging and while driving.
The BJB or PDU takes over the distribution function. It directs the current precisely to the components that need to be supplied with power and at the same time protects them from overload. Performance and safety aspects make BDUs and BJBs/PDUs indispensable in modern electric vehicles.
This is precisely why high precision and reliability are key characteristics of these systems. Our sensors help to fulfill these requirements.

Precision measurement technology for BDUs & BJBs/PDUs

We specialize in the development of precision measurement technology that improves the efficiency of BDUs and BJB/PDUs. We offer customizable components for both high voltage (HV) and 12 to 48 volt applications.
12 to 48 volt applications.
Our products are characterized by their high accuracy over the entire temperature range and always offer optimal performance under different conditions.
In addition, our products guarantee maximum reliability over their entire service life. Particularly noteworthy is the latest generation of our IVT series, which meets the requirements for functional safety in accordance with the strict DIN EN ISO 26262 standards.
Longer
battery life
Our components enable safe and loss-free disconnection of the battery from the system during the charging process. This preserves the capacity of batteries for longer.
Reliability and safety
Our sensors ensure a reliable power supply and protect the battery and electronic components from overloads and short circuits.
Precise power distribution
Our advanced measurement technology ensures precise power distribution. This improves the performance and reliability of the entire system and helps to optimize energy efficiency.
Our products for your BDU/BJB/PDU
If you cannot find a suitable product for your requirements here, please contact us.
BAL
Very low-resistance busbar shunt in a small design for battery management systems. Resistance value 100µOhm
Product area: | Resistor |
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Size: | 5216 |
Power (Watt): | 12 |
Tol (%): | 5.00 |
Res (Ohm): | 0.0001 |

BAN
Very low-resistance busbar shunt for battery management systems or energy storage systems. Resistance value 25 µOhm.
Product area: | Resistor |
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Size: | 8436 |
Power (Watt): | 36 |
Tol (%): | 5.00 |
Res (Ohm): | 0.000025 |

BAS
Very low-resistance busbar shunt for battery management systems or energy storage systems. Resistance values between 35µOhm and 500µOhm.
Product area: | Resistor |
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Size: | 8420 |
Power (Watt): | 10 - 36 |
Tol (%): | 5.00 |
Res (Ohm): | 0.000035 - 0.0005 |

BAV
Very low-resistance busbar shunt for battery management systems or energy storage systems. Resistance values between 35 µOhm and 100 µOhm, Pressfit connections.
Product area: | Resistor |
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Size: | 8420 |
Power (Watt): | 36 |
Tol (%): | 5.00 - 10.0 |
Res (Ohm): | 0.000035 - 0.0001 |

BAX
Very low-resistance busbar shunt for battery management systems or energy storage systems. Resistance values of 20 µOhm and 25 µOhm.
Product area: | Resistor |
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Size: | 8436 |
Power (Watt): | 50 |
Tol (%): | 5.00 |
Res (Ohm): | 0.000005 - 0.00002 |

BSL
Where very high accuracy and reliability and a separation of the battery management system from the busbar currents is key to success, the analog sensor series from Isabellenhütte is the perfect fit. The temperature and current measurement designed for battery management ICs offers two of the most important functions of the battery management system with optimum functionality and expertise in shunt-based current measurement. Resistance value 100µOhm, NTC temperature measurement and DMC for factor-based TCR compensation
Product area: | Resistor |
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Size: | 5216 |
Power (Watt): | 10 |
Tol (%): | 5.00 |
Res (Ohm): | 0.0001 |

BSN
Where very high accuracy and reliability and a separation of the battery management system from the busbar currents is key to success, the analog sensor series from Isabellenhütte is the perfect fit. The redundant temperature and current measurement designed for battery management ICs offers two of the most important functions of the battery management system with optimum functionality and expertise in shunt-based current measurement. Resistance value 25µOhm, NTC temperature measurement and DMC for factor-based TCR compensation
Product area: | Resistor |
---|---|
Size: | 8436 |
Power (Watt): | 36 |
Tol (%): | 5.00 |
Res (Ohm): | 0.000025 |

BSS
Where very high accuracy and reliability and a separation of the battery management system from the busbar currents is key to success, the analog sensor series from Isabellenhütte is the perfect fit. The temperature and current measurement designed for battery management ICs offers two of the most important functions of the battery management system with optimum functionality and expertise in shunt-based current measurement.
Product area: | Resistor |
---|---|
Size: | 8420 |
Power (Watt): | 20 - 30 |
Tol (%): | 5.00 |
Res (Ohm): | 0.00005 - 0.0001 |

BSX
Where very high accuracy and reliability and a separation of the battery management system from the busbar currents is key to success, the analog sensor series from Isabellenhütte is the perfect fit. The temperature and current measurement designed for battery management ICs offers two of the most important functions of the battery management system with optimum functionality and expertise in shunt-based current measurement. Resistance value 25 µOhm, NTC temperature measurement and DMC for factor-based TCR compensation.
Product area: | Resistor |
---|---|
Size: | 8436 |
Power (Watt): | 45 |
Tol (%): | 5.00 |
Res (Ohm): | 0.000025 |

ICD-A
The ICD series is a compact precision current measurement system. It uses shunt-based current measurement for maximum accuracy and has a CAN interface. It also contains a 16-bit ADC for measured value acquisition. The ICD can be used in many 12V DC applications.
Product area: | Sensor |
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Current Range: | 0 - 500 |
Current Range Options: | 100, 300, 500 |
Interface: | CAN (2.0 a/b) communication - with termination, CAN (2.0 a/b) communication - without termination |
Hardware setup: | 12 V |
Configuration: | 16-bit analog-digital converter |
Plating shunt: | nickel plated |

IVT-3-Base
The IVT 3 is a compact high precision current measurement device, which is built on a platform concept where functional components can be added to adapt to many different use cases. The IVT 3 series is developed according to ISO 26262:2018 (Road vehicles – Functional safety).
Product area: | Sensor |
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Current Range: | 0 - 1000 |
Current Range Options: | 1000 |
Interface: | CAN (2.0 a/b) communication - with termination, CAN (2.0 a/b) communication - without termination |
Hardware setup: | 12 V |
Configuration: | Isolated (1,000 V) |
Plating shunt: | nickel plated |

IVT-3-Pro
The IVT 3 is a compact high precision current measurement device, which is built on a platform concept where functional components can be added to adapt to many different use cases. The Pro version supports insulation resistance monitoring and 3 or 6 voltage measurement channels. The IVT 3 series is developed according to ISO 26262:2018 (Road vehicles – Functional safety).
Product area: | Sensor |
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Current Range: | 0 - 1000 |
Current Range Options: | 1000 |
Voltage Range: | 0 - 1000 |
Voltage Channels: | 6, 3 |
Interface: | CAN (2.0 a/b) communication - with termination, CAN (2.0 a/b) communication - without termination |
Hardware setup: | 12 V, 24 V |
Configuration: | Isolated (1,000 V), isolated + insulation monitoring, isolated + insulation monitoring + As-/Wh-counter |
Plating shunt: | nickel plated |

IVT-S
The IVT-S is a compact, high-precision current measurement system equipped with a CAN interface. The continuous current measurement covers a measuring range of up to ±2,500 A and can be extended by up to 3 voltage measurement channels (nom. 1000 V). The IVT-S has been the benchmark for precise current and voltage measurement since 2017.
Product area: | Sensor |
---|---|
Current Range: | 0 - 2500 |
Current Range Options: | 100, 300, 500, 1000, 2500 |
Voltage Range: | 0 - 1000 |
Voltage Channels: | 3 |
Interface: | CAN (2.0 a/b) communication - with termination, CAN (2.0 a/b) communication - without termination |
Hardware setup: | 12 V, 24 V |
Configuration: | Isolated (1,000 V) |
Plating shunt: | nickel plated, tin plated |
