Current measurement for power tools

Shunt resistors precisely measure the current flow in power tools and thus enable exact control of the motor power - for optimum performance, efficiency and safety. They detect overloads or inefficient states at an early stage, protect the electronics and extend the service life. Particularly with battery-powered devices, they contribute to energy optimization by dynamically adjusting power consumption. With their high precision, temperature stability and compact design, Isabellenhütte shunts are ideal for modern power tools.

Almost all developers who want to select the right shunt for their power tool system are faced with the same question: choosing a higher shunt resistance for a higher voltage drop is important for a higher measurement resolution and system accuracy. At the same time, however, the power loss through the shunt increases, which leads to undesirable heating of the circuit board of the power tool. This temperature increase also affects the accuracy due to the temperature coefficient of resistance (TCR). For this reason, lower resistance values are preferable.

Effective heat dissipation

The low internal thermal resistance ensures minimal heating of the PCB, which increases system performance and reliability.

Durability & reliability

Our shunts support the long service life of the power tools through stable performance and reduced heat exposure.

High measuring accuracy

Thanks to the low TCR and optimized voltage drop, our shunts offer precise measurements.

Our products for your power tools

If you cannot find a suitable product for your requirements here, please contact us.

BVB

4-terminal resistor made of composite material. Ideal for use on DCB and FR4 Space-saving design.

Product area:	Resistor
Size:	2725
Power (Watt):	3 - 12
Tol (%):	1.00
Res (Ohm):	0.0002 - 0.005

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BVE

2-terminal resistor made of composite material. Very low resistance values. Large connectors for high currents.

Product area:	Resistor
Size:	5930
Power (Watt):	4 - 15
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0001 - 0.003

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BVN

4-terminal resistor made of composite material. Ideal for use on DCB and FR4. Space-saving design.

Product area:	Resistor
Size:	1216
Power (Watt):	3 - 10
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0003 - 0.003

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BVR

4-terminal resistor made of composite material. Ideal for use on DCB and FR4. Very low resistance values.

Product area:	Resistor
Size:	4026
Power (Watt):	5 - 12
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0002 - 0.003

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BVS

2-terminal resistor made of composite material. Very low resistance values. Large connectors for high currents.

Product area:	Resistor
Size:	3920
Power (Watt):	2.5 - 12
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0001 - 0.005

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BVT

2-terminal resistor made of composite material. Very low resistance values. Large connectors for high currents.

Product area:	Resistor
Size:	2512
Power (Watt):	1.5 - 10
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0002 - 0.0068

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BVZ

2-terminal resistor made of composite material. Ideal for use on DCB. Space-saving design.

Product area:	Resistor
Size:	4026
Power (Watt):	5 - 13
Tol (%):	1.00 - 5.00
Res (Ohm):	0.000525 - 0.003

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CMK

2-terminal resistor for medium power requirements. Low TC <50ppm/K for the entire value range.

Product area:	Resistor
Size:	1206
Power (Watt):	0.5 - 4
Tol (%):	1.00 - 5.00
Res (Ohm):	0.005 - 0.1

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CMP

2-terminal resistor for medium power requirements. Low TC <50ppm/K for the entire value range.

Product area:	Resistor
Size:	2010
Power (Watt):	1 - 2
Tol (%):	1.00 - 5.00
Res (Ohm):	0.01 - 0.5

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CMS

2-terminal resistor for medium power requirements. Low TC <50ppm/K for the entire value range.

Product area:	Resistor
Size:	2512
Power (Watt):	2 - 2.5
Tol (%):	1.00 - 5.00
Res (Ohm):	0.01 - 0.5

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FMH

Zero Ohm Resistor / Jumper. Solid metal plate design. Ideal for high load applications up to 35 A.

Product area:	Resistor
Size:	0603
Power (Watt):	0.135
Res (Ohm):	0.0002

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FMK

2-terminal resistor. Low resistance values <=6 milliohms. Good TC. Solid construction as metal plate. High pulse load.

Product area:	Resistor
Size:	1206
Power (Watt):	1 - 3.5
Tol (%):	1.00 - 10.0
Res (Ohm):	0.002 - 0.006

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FMP

2-terminal resistor. Low resistance values <=6 milliohms. Good TC. Solid construction as metal plate. High pulse load.

Product area:	Resistor
Size:	2010
Power (Watt):	1 - 3.5
Tol (%):	1.00 - 5.00
Res (Ohm):	0.002 - 0.006

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SMK

2-terminal resistor with large solder pads. Very powerful. Largest selection of resistor values up to 0.5 Ohm.

Product area:	Resistor
Size:	1206
Power (Watt):	1 - 1.5
Tol (%):	1.00 - 5.00
Res (Ohm):	0.008 - 0.5

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SMP

2-terminal resistor with large solder pads, very powerful. Largest selection of resistor values up to 1 Ohm.

Product area:	Resistor
Size:	2010
Power (Watt):	2 - 3
Tol (%):	0.500 - 1.00
Res (Ohm):	0.005 - 1

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SMS

2-terminal resistor with large solder pads. Very powerful. Largest selection of resistance values up to 1 Ohm.

Product area:	Resistor
Size:	2512
Power (Watt):	3 - 5
Tol (%):	0.500 - 5.00
Res (Ohm):	0.005 - 1

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SMT

2-terminal resistor with large solder pads. Very powerful. Largest selection of resistor values up to 4.7 Ohm.

Product area:	Resistor
Size:	2817
Power (Watt):	5 - 7
Tol (%):	0.500 - 5.00
Res (Ohm):	0.004 - 4.7

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VMK

2-terminal resistor. Standard solder pad geometry. Very low TC <20ppm/K for the entire value range. High continuous load, wide range of resistance values up to 470 mOhm.

Product area:	Resistor
Size:	1206
Power (Watt):	1 - 1.5
Tol (%):	1.00 - 5.00
Res (Ohm):	0.01 - 0.47

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VMP

2-terminal resistor. Standard solder pad geometry. Very low TC <20ppm/K for the entire value range. High continuous load. Wide range of resistance values up to 1 Ohm.

Product area:	Resistor
Size:	2010
Power (Watt):	2 - 3
Tol (%):	1.00 - 5.00
Res (Ohm):	0.005 - 1

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VMS

2-terminal resistor. Standard solder pad geometry. Very low TC <20ppm/K for the entire value range. High continuous load. Wide range of resistance values up to 1 Ohm.

Product area:	Resistor
Size:	2512
Power (Watt):	3 - 4
Tol (%):	1.00 - 5.00
Res (Ohm):	0.005 - 1

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WAF

2-terminal resistor made of roll-clad strip material, high load capacity, very small design, low values <=1mΩ.

Product area:	Resistor
Size:	1213
Power (Watt):	6 - 7
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0005 - 0.001

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WAK

2-terminal resistor made of roll-clad strip material, high load capacity, very small design, low values <=1mΩ very low inductance.

Product area:	Resistor
Size:	1206
Power (Watt):	6
Tol (%):	1.00 - 5.00
Res (Ohm):	0.0005 - 0.001

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