Ametherm MS22 12104

Ametherm MS22 12104
The MS22 12104 inrush current limiting thermistor from Ametherm offers a maximum steady state current of 4A (up to +25°C), resistance of 120Ω ±25% (at 25°C) and a maximum recommended energy rating of 220J. Ametherm's MegaSurge™ series of inrush current limiting NTC thermistors reduce costs and greatly simplify designs. In addition, they increase safety by eliminating the fire hazard associated with failed relays. While traditional thermistors are only certified for input voltages from 85 VAC to 265 VAC, UL recognised MegaSurge™ devices are certified for single and three phase input voltages up to 480 VAC. These specifications are the highest of any single-solution inrush current limiting device on the market.
  • Inrush current limiting thermistor
  • Resistance of 120Ω ±25% (at 25°C)
  • Maximum steady state current of 4A (up to +25°C)
  • Maximum recommended energy of 220J (Actual energy failure at 450J)
  • 0.75Ω at 100% maximum current and 1.98Ω at 50% maximum current
  • Body temperature of +175°C at maximum current
  • Material type M (for beta and curve)
  • Dissipation constant of 75.4mW/°C
  • Thermal time constant of 124mW/s
  • Recognised by Underwriters Laboratories (UL) for ensured safety

Typical applications for the MS22 series include:

  • Inrush current protection of power supplies
  • Motor controllers, Audio amplifiers, Battery chargers and Frequency generators,
  • Plasma cutting tools, MRI machines and Toroidal transformers
The below table gives the full specifications of the Ametherm MS22 12104 series:

Ametherm MS22 12104 Specifications
Specifications
Additional Features
  • Inrush current limiting thermistor
  • Suitable for high energy and short term high current applications
  • Dissipation constant 75.4mW/°C
  • Thermal time constant 124mw/s
  • Material type M (for beta and curve)
  • Recognised by Underwriters Laboratories (UL) for ensured safety
Body Temperature
  • +175°C at maximum current
Maximum Recommended Energy
  • 220J (actual energy failure at 450J)
Maximum Steady State Current
  • 4A (upto +25°C)
Resistance at +25°C
  • 120Ω ±25%
Resistance at Maximum Current (RImax)
  • 0.75Ω at 100% maximum current
  • 1.98Ω at 50% maximum current

We are pleased to provide you with a range of additional content including videos, product datasheets, case studies, white papers and application notes for your reference. Please see below for the latest content available:

 

 

DOCUMENTATION
PDF DocumentAmetherm MS22 12104 MegaSurge™ inrush current limiting thermistor datasheet

 

 

 

VIDEOS
Limiting Inrush Current with NTC and PTC Themistors

Learn how to limit inrush current using NTC and PTC thermistors in this presentation by Ametherm.

Many applications today, including industrial machinery, power tools and other high current equipment, use limiting inrush current as a major design consideration to combat the problematic effects of inrush current.

Inrush current occurs when a system powers on and experiences a spike in current. This current can be substantially higher than standard operating current. If not properly managed, it can reduce the effective operating life and impose damage to equipment. For example, inrush current could disable a cooling fan, eventually leading to total system failure.

Applications that are switched on and off quickly, such as welding equipment, present a particular concern for limiting inrush current. The limiting inrush current circuit must reset instantaneously during each power on to protect the system. This further complicates the management of inrush current.

NTC stands for Negative Temperature coefficient. The NTC thermistor provides variable resistance based on temperature. As temperature increases, the resistance drops from high to low and allows current to pass through.

PTC stands for Positive Temperature Coefficient. The PTC thermistor also provides variable resistance based on temperature. As temperature rises, resistance increases from low to high and blocks inrush current.

Typically, NTC-based limiting is used for most applications. However, there are certain scenarios that require a PTC thermistor over an NTC thermistor. These include equipment with a near-zero reset time, extreme temperature conditions, and systems that experience frequent shorts.
Limiting Inrush Current for a 40VA Transformer

Inrush current often causes problems for transformers. This video will show you how to calculate the right inrush current limiter for your transformer in 7 simple steps.
DC Motor Inrush Current and What You Need to Know

What does inrush current have to do with DC motors? This video answers that question by discussing the cause of DC motor inrush current and how to prevent the inrush of current at startup from possibly damaging the DC motor with the use of Ametherm's Inrush Current Limiters. They start by explaining how a DC motor functions, its applications and key components, how inrush current factors in, how to solve the problem of inrush current, and how to select the right inrush current limiter for your application with three easy steps.
VIDEOS
Limiting Inrush Current with NTC and PTC Themistors

Learn how to limit inrush current using NTC and PTC thermistors in this presentation by Ametherm.

Many applications today, including industrial machinery, power tools and other high current equipment, use limiting inrush current as a major design consideration to combat the problematic effects of inrush current.

Inrush current occurs when a system powers on and experiences a spike in current. This current can be substantially higher than standard operating current. If not properly managed, it can reduce the effective operating life and impose damage to equipment. For example, inrush current could disable a cooling fan, eventually leading to total system failure.

Applications that are switched on and off quickly, such as welding equipment, present a particular concern for limiting inrush current. The limiting inrush current circuit must reset instantaneously during each power on to protect the system. This further complicates the management of inrush current.

NTC stands for Negative Temperature coefficient. The NTC thermistor provides variable resistance based on temperature. As temperature increases, the resistance drops from high to low and allows current to pass through.

PTC stands for Positive Temperature Coefficient. The PTC thermistor also provides variable resistance based on temperature. As temperature rises, resistance increases from low to high and blocks inrush current.

Typically, NTC-based limiting is used for most applications. However, there are certain scenarios that require a PTC thermistor over an NTC thermistor. These include equipment with a near-zero reset time, extreme temperature conditions, and systems that experience frequent shorts.
Limiting Inrush Current for a 40VA Transformer

Inrush current often causes problems for transformers. This video will show you how to calculate the right inrush current limiter for your transformer in 7 simple steps.
DC Motor Inrush Current and What You Need to Know

What does inrush current have to do with DC motors? This video answers that question by discussing the cause of DC motor inrush current and how to prevent the inrush of current at startup from possibly damaging the DC motor with the use of Ametherm's Inrush Current Limiters. They start by explaining how a DC motor functions, its applications and key components, how inrush current factors in, how to solve the problem of inrush current, and how to select the right inrush current limiter for your application with three easy steps.

RoHS Compliance

This product is available fully compliant to the RoHS EU directive 2011/65/EU.

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