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We’re Exhibiting at EDS 2025
The Engineering Design Show, 8 – 9 October 2025, Coventry Building Society Arena, UK, Stand J3
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:
| Weight | 0.17000 kg |
|---|---|
| Dimensions | 20.00 x 100.00 x 60.00mm |
| Current Rating | |
| Maximum Resistance | 1Ω |
| Minimum Resistance | 0.001Ω |
| Power Rating | |
| Product Type | |
| Resistance Value | |
| Series / Model | |
| Temperature Coefficient | |
| Temperature Range (°C) | -55 to +85°C |
| Tolerance |
| SKU | Resistance Value | Temperature Coefficient | Tolerance |
|---|---|---|---|
| Alpha PSBW (0.001Ω - 0.005Ω) B | Custom (0.001Ω - 0.005Ω) | ±15 ppm/°C | ±0.1% |
| Alpha PSBW (0.001Ω - 0.005Ω) D | Custom (0.001Ω - 0.005Ω) | ±15 ppm/°C | ±0.5% |
| Alpha PSBW (0.001Ω - 0.005Ω) F | Custom (0.001Ω - 0.005Ω) | ±15 ppm/°C | ±1% |
| Alpha PSBW (0.005Ω - 1Ω) B | Custom (0.005Ω - 1Ω) | ±15 ppm/°C | ±0.1% |
| Alpha PSBX (0.005Ω - 1Ω) B | Custom (0.005Ω - 1Ω) | ±5 ppm/°C | ±0.1% |
| Alpha PSBW (0.005Ω - 1Ω) D | Custom (0.005Ω - 1Ω) | ±15 ppm/°C | ±0.5% |
| Alpha PSBX (0.005Ω - 1Ω) D | Custom (0.005Ω - 1Ω) | ±5 ppm/°C | ±0.5% |
| Alpha PSBW (0.005Ω - 1Ω) F | Custom (0.005Ω - 1Ω) | ±15 ppm/°C | ±1% |
| Alpha PSBX (0.005Ω - 1Ω) F | Custom (0.005Ω - 1Ω) | ±5 ppm/°C | ±1% |
