Inrush Current Limiting

Inrush Current Limiting

Inrush current limiting thermistors are used for protecting the circuit against occasional current spikes significantly higher than normal operating current, which could otherwise damage the equipment. At Rhopoint Components we offer a range of current limiting resistors from industry leading manufacturer Ametherm, with various sizes, resistance and maximum steady state current options available. The Ametherm thermistors compare favourably with traditional inrush current limiters, offering lower current density, faster reset time, wider temperature range and virtually no derating. Browse our selection of Ametherm Inrush Current Limiting Thermistors below.

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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

Ametherm AS35 20010

The AS35 20010 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 10A (up to +65°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 +65°C)
  • Maximum recommended energy of 500J (Actual energy failure at 1000J)
  • 0.00Ω at 100% maximum current and 0.38Ω at 50% maximum current
  • Body temperature of +210°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 20010 series:

Ametherm AS35 20010 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS35 2R035

The AS35 2R035 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 35A (up to +65°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 35A (up to +65°C)
  • Maximum recommended energy of 700J (Actual energy failure at 1400J)
  • 0.00Ω at 100% maximum current and 0.03Ω 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 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 2R035 series:

Ametherm AS35 2R035 Specifications

£0.00 Ex Tax: £0.00

Ametherm AS35 3R030

The AS35 3R030 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 30A (up to +65°C) and a resistance of 3Ω ±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 3Ω ±25% (at 25°C)
  • Maximum steady state current of 30A (up to +65°C)
  • Maximum recommended energy of 600J (Actual energy failure at 1200J)
  • 0.00Ω at 100% maximum current and 0.05Ω at 50% maximum current
  • Body temperature of +226°C at maximum current
  • Material type B (for beta and curve)
  • Dissipation constant of 83.5mW/°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 3R030 series:

Ametherm AS35 3R030 Specifications

£0.00 Ex Tax: £0.00