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Current sensing resistors are resistors used for measuring current in the circuit which can be converted using Ohm’s Law into a voltage reading. They usually come in very low resistance values, often measured in micro Ohms. At Rhopoint Components we offer a wide range of current sensing resistors by leading manufacturers including Isabellenhutte, Alpha, Caddock, Riedon and Susumu. Our current sensing resistors come in various shapes and sizes, surface-mount and through-hole, and we can cater for virtually any resistance value.
Can't find what you're looking for? Contact us, we can often offer customised solution to meet all your needs.
The FNP high power precision shunt resistor series from Alpha Electronics offers a range of very high precision current sensing shunts with a maximum power rating of 500W on a suitable heat sink at +25°C. By utilising a Ni-Cr Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients. The FNP shunt resistor series has a built in Pt100 sensor for monitoring the temperature of the resistive element.
The Alpha Electronics FNP precision shunt resistor series are constructed out of the following materials:
Alpha's Ni-Cr Bulk Metal® foil resistor technology means these high power precision shunt resistors resistors are ideal in applications like:
The below table gives a summary of the specifications and options available for the Alpha FNP series:
* Keep temperature of the resistive element surface less than +125°C
** Please contact us for higher resistance values
£0.00 Ex Tax: £0.00
The PSB ultra-precision power shunt resistor series from Alpha Electronics offers 4-terminal (Kelvin) connections for current sensing and a power rating of up to 40W on a heat sink or 12W in free air (at +25°C) all with a low ohmic resistance range from 0.001Ω to 1Ω. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer excellent temperature characteristics with low temperature coefficients down to ±5 ppm/°C between the resistance range 0.005Ω and 1Ω.
The PSB ultra-precision shunt resistor series exhibits excellent temperature characteristics thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.
The 4-terminal connections of this high power shunt series offers accurate current sensing capabilities even in low extremity of resistance.
The PSB series has been designed for easy mounting to heat sink or water-cooled radiator as well as with threaded holes to fix cables with screws (Caution: please screw current terminals >5N·m and voltage terminals >1N·m)
Their 4-terminal design and high precision make them ideal for current sensing in precise power supply or motor driver applications.
The below table gives a summary of the specifications and options available for the Alpha PSB series:
* Thermal resistance of the heat sink 1°C/W
Available to use higher rated power with elevation of cooling effect
Please keep temperature of element surface less than +60°C
£0.00 Ex Tax: £0.00
The RBD ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.
The RBD ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.
The below table gives the full specifications for each resistor model available including the Alpha RBD series:
* Symbols parenthesized are for part number composition
£0.00 Ex Tax: £0.00
The RBF ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.
The RBF ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.
The below table gives the full specifications for each resistor model available including the Alpha RBF series:
* Symbols parenthesized are for part number composition
£0.00 Ex Tax: £0.00
The RBH ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 4-terminal (Kelvin connection) flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C between -25°C and +125°C.
The RBH ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.
The below table gives the full specifications for each resistor model available including the Alpha RBH series:
* Symbols parenthesized are for part number composition
£0.00 Ex Tax: £0.00
The RWA precision wraparound SMD resistor series from Alpha Electronics offers resistances from 100Ω up to 5kΩ, all with a small 0603 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.05% (between 1kΩ and 5kΩ) as well as a low TCR of ±5 ppm/°C (between -25°C and +125°C) over the whole resistance range. The Alpha RWA series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).
The RWA high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
The below table gives the full specifications for each resistor model available including the Alpha RWA series:
£0.00 Ex Tax: £0.00
The RWB precision wraparound SMD resistor series from Alpha Electronics offers resistances from 10Ω up to 10kΩ, all with a small 0805 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.02% (between 1kΩ and 10kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 10kΩ. The Alpha RWB series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).
The RWB high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
The below table gives the full specifications for each resistor model available including the Alpha RWB series:
£0.00 Ex Tax: £0.00
The RWC precision wraparound SMD resistor series from Alpha Electronics offers resistances from 5Ω up to 30kΩ, all with a small 1206 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.01% (between 1kΩ and 30kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 30kΩ. The Alpha RWC series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).
The RWC high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
The below table gives the full specifications for each resistor model available including the Alpha RWC series:
£0.00 Ex Tax: £0.00
The A-H1 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance values range from 0.001Ω to 100Ω available. The A-H1 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.
Typical applications for the A-H1 series include:
The below table gives an overview of the specifications for the Isabellenhütte A-H1 series:
* Please contact us for available parts or see the ordering information tab
£0.00 Ex Tax: £0.00
The A-H2 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance values range from 0.001Ω to 100Ω available. The A-H2 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.
Typical applications for the A-H2 series include:
The below table gives an overview of the specifications for the Isabellenhütte A-H2 series:
* Please contact us for available parts or see the ordering information tab
£0.00 Ex Tax: £0.00
The AZ-H1 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications with very low TCR. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance range of 0.002Ω to 1Ω. The AZ-H1 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.
Typical applications for the AZ-H1 series include:
The below table gives an overview of the specifications for the Isabellenhütte AZ-H1 series:
* Please contact us for available parts or see the ordering information tab
£0.00 Ex Tax: £0.00
The AZ-H2 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications with very low TCR. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance range of 0.002Ω to 1Ω. The AZ-H2 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.
Typical applications for the AZ-H2 series include:
The below table gives an overview of the specifications for the Isabellenhütte AZ-H2 series:
* Please contact us for available parts or see the ordering information tab
£0.00 Ex Tax: £0.00
The BAC precision resistor series from Isabellenhütte includes a PCB with connector for voltage sensing, designed for battery management systems or welding equipment with a low resistance value of 50µΩ or 100µΩ. The BAC series from Isabellenhütte is available with untinned or Ni-plated terminals, continuous load up to 550A (50µΩ) within a chip size of 8420.
Typical applications for the BAC series include:
The below table gives an overview of the specifications for the Isabellenhütte BAC series:
£0.00 Ex Tax: £0.00
The BAS precision resistor series from Isabellenhütte, designed for battery management systems or welding equipment with a low resistance values from 0.000035Ω to 0.0005Ω. The BAS series from Isabellenhütte is available with tinned or untinned terminals, continuous load up to 350A (100µΩ) within a chip size of 8420.
Typical applications for the BAS series include:
The below table gives an overview of the specifications for the Isabellenhütte BAS series:
£0.00 Ex Tax: £0.00
The BKW 4-terminal precision resistor series from Isabellenhütte, designed for energy meters with resistance values from 0.0003Ω to 0.0005Ω. The BKW series from Isabellenhütte has extremely good long-term stability, thus the energy meters do not require any recalibration, very high reproducibility of R-value and TCR.
Typical applications for the BKW series include:
The below table gives an overview of the specifications for the Isabellenhütte BKW series:
£0.00 Ex Tax: £0.00
