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Alpha ADR 1-Dial Series

The ADR 1-dial resistance box series from Alpha Electronics offers a range of standard resistors which are ideally suited for repetitive daily work. The single dial system means the resistance is easily switched from one value to another. This greatly improves work efficiency and helps to avoid mistakes, which may happen when using a 6-dial decade standard resistor. They are ideally suited for RTD simulation for platinum (Pt) related products and conductive meters.

  • Fully customisable 1-dial resistance box (up to 24 resistance values)
  • Up to 5-digit resistance values on switching contacts may be specified
  • Resistance values available from 1Ω up to 1MΩ
  • Improved work efficiency and elimination of careless mistakes
  • Lightweight, compact size
  • High precision
  • High stability

The resistance elements utilise Bulk Metal® Foil technology and the connections to the rotary switch are made by using 4-terminal junctions. This ensures that high precision, high stability and low temperature coefficients are achieved.

The ADR-1xxx 1-Dial resistance box is fully customisable. Up to 24 different resistance values can be set into the box.

The ADR-1xxx series has a weight of approximately 1kg and dimensions of 100mm x 150mm x 80mm.

The below table gives the full specifications available for the Alpha ADR 1-dial resistance box series:

Alpha ADR 1-Dial Specifications

Tolerance and temperature coefficient varies with resistance values.

£0.00 Ex Tax: £0.00

Alpha HC Series

The HC resistor series from Alpha Electronics offers their ultra-precision resistor capabilities in a hermetically sealed package. With a resistance range from 1Ω up to 120kΩ all in a small through-hole package with a pin pitch of 3.81 ±0.25mm. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Ultra-precision hermetically sealed resistor
  • Available in any resistance between 1Ω and 120kΩ
  • Through-hole package with a pin pitch of 3.81 ±0.25mm
  • Tight tolerance options as low as ±0.005% available for resistances between 30Ω and 120kΩ
  • Tight TCR options available of ±1 ppm/°C (from 0°C up to +65°C, between 30Ω and 120kΩ) or ±2.5 ppm/°C (from -55°C up to +125°C, between 30Ω and 120kΩ)
  • Maximum working voltage of 300V
  • Power rating of 0.3W (at +125°C)
  • Maximum rated operating temperature +125°C
  • Working temperature from -65°C up to +150°C

The Alpha Electronics HC hermetically sealed ultra-precision resistor series have been designed with longer leads to ensure the correct clearance from the PCB is achieved when soldering. It is advised that the resistors are kept over 10mm away from the board surface by using an insulating tube.


The below table gives a summary of the specifications available for each resistor model including the Alpha HC series:

Alpha HC Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring the leads at point 12.7 ±3.2mm away from the base for type HC and HD, but, in case of resistance below 10Ω, the value at 1.6 ±0.6mm away from the base for all types
** Temperature characteristic Z is applicable for temperature range between 0°C and +60°C

£0.00 Ex Tax: £0.00

Alpha LSR Series

The LSR high power standard resistor series from Alpha Electronics was developed to meet the requirements of high current / low resistance applications. Bulk Metal® Foil resistive elements are used to ensure the best long-term stability and lowest temperature coefficients are achieved. The enclosure is manufactured from perforated aluminium to allow effective air flow and temperature dissipation during high power operation. The LSR series is designed to be used in air without oil bath submersion or additional cooling.

  • High power standard resistor
  • Long-term stability better than 20 ppm/year
  • Temperature coefficient of ±2.5 ppm/°C
  • Temperature efficient design to control self-heating
  • Excellent AC characteristics due to Bulk Metal® Foil technology
  • Compact construction designed for simple operation and storage
  • Maximum power rating of 4W available
  • Working temperature range of +18°C to +28°C
  • Storage temperature range of 0 to +50°C
  • 4-terminals

LSR high power standard resistor series is suitable for a range of applications such as high precision measurement, corporate metrology calibration labs and references for precision power supplies.

The 1mΩ version has an option to change the terminal knobs for 4W (63A) power measuring capabilities. The P at the end of the model number denotes the high power option.

The LSR series has a weight of approximately 0.6kg and dimensions of 140mm x 90mm x 90mm.

The below table gives the full specifications for each model available of the Alpha LSR series:

Alpha LSR Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 0R530

The AS32 0R530 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 30A (up to +25°C) and a resistance of 0.5Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 0.5Ω ±25% (at 25°C)
  • Maximum steady state current of 30A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.01Ω at 100% maximum current and 0.03Ω at 50% maximum current
  • Body temperature of +183°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 63mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 0R530 series:

Ametherm AS32 0R530 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 0R536

The AS32 0R536 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 36A (up to +25°C) and a resistance of 0.5Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 0.5Ω ±25% (at 25°C)
  • Maximum steady state current of 36A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.01Ω at 100% maximum current and 0.03Ω at 50% maximum current
  • Body temperature of +183°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 55mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 0R536 series:

Ametherm AS32 0R536 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 10015

The AS32 10015 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 15A (up to +25°C) and a resistance of 10Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 10Ω ±25% (at 25°C)
  • Maximum steady state current of 15A (up to +25°C)
  • Maximum recommended energy of 250J (Actual energy failure at 500J)
  • 0.03Ω at 100% maximum current and 0.06Ω at 50% maximum current
  • Body temperature of +185°C at maximum current
  • Material type I (for beta and curve)
  • Dissipation constant of 85.2mW/°C
  • Thermal time constant of 64mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 10015 series:

Ametherm AS32 10015 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 1R030

The AS32 1R030 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 30A (up to +25°C) and a resistance of 1Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 1Ω ±25% (at 25°C)
  • Maximum steady state current of 30A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.01Ω at 100% maximum current and 0.03Ω at 50% maximum current
  • Body temperature of +215°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 48mW/°C
  • Thermal time constant of 55mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 1R030 series:

Ametherm AS32 1R030 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 1R036

The AS32 1R036 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 36A (up to +25°C) and a resistance of 1Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 1Ω ±25% (at 25°C)
  • Maximum steady state current of 36A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.02Ω at 100% maximum current and 0.03Ω at 50% maximum current
  • Body temperature of +215°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 48mW/°C
  • Thermal time constant of 60mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 1R036 series:

Ametherm AS32 1R036 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 20010

The AS32 20010 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 10A (up to +25°C) and a resistance of 20Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 20Ω ±25% (at 25°C)
  • Maximum steady state current of 10A (up to +25°C)
  • Maximum recommended energy of 250J (Actual energy failure at 500J)
  • 0.06Ω at 100% maximum current and 0.13Ω at 50% maximum current
  • Body temperature of +192°C at maximum current
  • Material type I (for beta and curve)
  • Dissipation constant of 58mW/°C
  • Thermal time constant of 67mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 20010 series:

Ametherm AS32 20010 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 2R025

The AS32 2R025 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 25A (up to +25°C) and a resistance of 2Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 2Ω ±25% (at 25°C)
  • Maximum steady state current of 25A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.02Ω at 100% maximum current and 0.04Ω at 50% maximum current
  • Body temperature of +220°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 0mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 2R025 series:

Ametherm AS32 2R025 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 50006

The AS32 50006 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 6A (up to +25°C) and a resistance of 50Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 50Ω ±25% (at 25°C)
  • Maximum steady state current of 6A (up to +25°C)
  • Maximum recommended energy of 250J (Actual energy failure at 500J)
  • 0.03Ω at 100% maximum current and 1.05Ω at 50% maximum current
  • Body temperature of +212°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 73mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 50006 series:

Ametherm AS32 50006 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS32 5R020

The AS32 5R020 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 20A (up to +25°C) and a resistance of 5Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 5Ω ±25% (at 25°C)
  • Maximum steady state current of 20A (up to +25°C)
  • Maximum recommended energy of 300J (Actual energy failure at 600J)
  • 0.03Ω at 100% maximum current and 0.06Ω at 50% maximum current
  • Body temperature of +255°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 0mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS32 5R020 series:

Ametherm AS32 5R020 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS35 0R550

The AS35 0R550 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 50A (up to +65°C) and a resistance of 0.5Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 0.5Ω ±25% (at 25°C)
  • Maximum steady state current of 50A (up to +65°C)
  • Maximum recommended energy of 800J (Actual energy failure at 1400J)
  • 0.00Ω at 100% maximum current and 0.02Ω at 50% maximum current
  • Body temperature of +210°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 55s

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS35 0R550 series:

Ametherm AS35 0R550 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS35 10018

The AS35 10018 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 18A (up to +65°C) and a resistance of 10Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 10Ω ±25% (at 25°C)
  • Maximum steady state current of 18A (up to +65°C)
  • Maximum recommended energy of 500J (Actual energy failure at 1000J)
  • 0.00Ω at 100% maximum current and 0.1Ω at 50% maximum current
  • Body temperature of +220°C at maximum current
  • Material type G (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 55s

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS35 10018 series:

Ametherm AS35 10018 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS35 1R040

The AS35 1R040 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 40A (up to +65°C) and a resistance of 1Ω ±25% (at 25°C). The Ametherm AS series are designed to withstand high steady-state current and input energy. Compared to traditional inrush current limiters, the devices offer lower current density, faster reset times, and a wider temperature range without derating. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue. The AS series from Ametherm are suitable for high energy and short term high current applications.

  • Inrush current limiting thermistor
  • Resistance of 1Ω ±25% (at 25°C)
  • Maximum steady state current of 40A (up to +65°C)
  • Maximum recommended energy of 800J (Actual energy failure at 1400J)
  • 0.00Ω at 100% maximum current and 0.02Ω at 50% maximum current
  • Body temperature of +210°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 78.2mW/°C
  • Thermal time constant of 55s

Typical applications for the AS series include:

  • Protection of pre-charge circuits in lithium ion batteries
  • Variable-frequency drives in sports equipment like treadmills, high-speed computers and processors
  • Switch mode power supplies for plasma cutters, welders, audio amplifiers, MRIs and x-ray machines
The below table gives the full specifications of the Ametherm AS35 1R040 series:

Ametherm AS35 1R040 Specifications

£0.00 Ex Tax: £0.00