Littelfuse – Fuses Varistors Protectors Suppressors

Developing and manufacturing devices that protect electronic circuits and applications from harm caused by overcurrent and overvoltage events..

Littelfuse – Fuses Varistors Protectors Suppressors

Littelfuse has developed solutions in the circuit protection area for many industries. They Include Automotive, Digital Consumer Electronics, Electrical, Industrial Electronics and Telecommunications.

Littelfuse - Fuses Varistors Protectors Suppressors

Products Include –

  • Gas Plasma Arresters (GDTs)
  • Silicon Avalanche Diode (SADs)
  • High Reliability and Military Components.

Littelfuse Inc.
8755 West Higgins Road, Suite 500 Chicago, Illinois 60631 United States

ROV Metal Oxide Varistors Raychem Tyco

The ROV device’s high current-handling and energy absorption capability, fast response, and low cost can make it suitable for use in line voltage applications.

ROV Metal Oxide Varistors Raychem Tyco

“ROV metal oxide varistors help protect power systems from damage caused by transient overvoltage faults such as lightning, power contact, and power induction. Suitable for a broad range of applications, ROV devices help protect sensitive electronic equipment from potential power surge damage by clamping high-energy, short-duration impluses.”

ROV Metal Oxide Varistors Raychem Tyco

“An ROV device is a varistor fabricated using a Zinc Oxide (ZnO) powder, sintered with other metal oxide ceramics. The resulting structure is a polycrystalline ceramic that consists of distributed ZnO grains, separated by other metal oxide ceramics.”

Raychem Circuit Protection Products

“A varistor is a variable resistor-a voltage dependent, non-linear device whose resistance decreases as the voltage applied across the device increases. ”

ROVs can also be used to help protect electrical equipment from damage caused by large voltage or power transients on the AC Mains inputs. In a coordinated circuit protection scheme the ROV can be paired with a PolySwitch overcurrent protection device to help improve equipment reliability and fulfill IEC-61000 test requirements.

Thermally Protected Suppressors – Dean Technology

CKE is a line of high voltage and high power silicon rectifiers, MOVs, selenium suppressors, silicon carbide varistors, and assemblies. These products are appropriate for a wide range of applications, and find a special fit in the power generation, resistance welding and RF power systems markets.

Thermally Protected Suppressors – Dean Technology

 Thermally Protected Suppressors - Dean Technology

22 to 50 kA, 150 to 690 VAC, 25nS Maximum

Dean Technology inc.

Dean Technology, Inc. has a long and exceptional history providing world-class products, design, and solutions for high voltage and high power markets and applications.

Dean Technology, Inc.
P.O. Box 700968, Dallas, Texas 75370, USA.

TMOV34S Thermally Protected Varistor – Littelfuse

It consists of a 34mm square format varistor element ( MOV) with an integral thermally activated element designed to open in the event of overheating due to abnormal over-voltage, limited current conditions as outlined in UL1449.

TMOV34S Thermally Protected Varistor – Littelfuse

The device has a third lead, an indicator lead, which may be used to indicate that the MOV has been disconnected from the circuit.

TMOV34S Thermally Protected Varistor - Littelfuse

The integrated configuration also offers lower inductance than most discreet solutions resulting in improved clamping performance to fast over voltage transients.

from Littelfuse

Mersen – Materials and Electrical Technologies

Mersen is a leader in electrical specialties and graphite-based materials. They provide sophisticated graphite products for the semiconductor fab process. They have power electronics components like cooling devices, busbars and semiconductor fuses.

Mersen – Materials and Electrical Technologies

They offer advanced materials for extreme industrial environments. These are like graphite, reactive metals, ceramics and polymers. They also manufacture polysilicon used in photovoltaic panels and have products and solutions for semiconductor fabrication.

Their products contribute to the safety and reliability of products like motors and generators which are important inn the areas of Energy Generation and Distribution.

Surge protection components

History – 1950 Le Carbone Lorraine takes over the worldwide distribution of products for Ferraz, an industrial fuse manufacturer based in Lyon.

Ferraz Shawmut – Power Components (now part of Mersen)

Industrial fuses, circuit protection, power interconnection, thermal management used in areas of power quality, power conversion, industrial controls.(Earlier Record in delabs)

Ametherm – Inrush Current Limiters and Thermistors

Since 1994, Ametherm has provided the most reliable and effective inrush current limiting solutions available.

Ametherm – Inrush Current Limiters and Thermistors

They have newly developed the MS 35 Series Inrush Current Limiters that are capable of handling up to 900 joules of energy and 50 amperes of steady state current. This will be a useful component to consider for power electronics engineers in the design of power supplies and inverters.

Protect An Inverter From Inrush Current

A common failure of inverters is overloading the inverter due to inrush current . This is due to the fact that most inverters are designed with a minimum amount of resistance to increase their efficiency and minimize losses due to heat.

Ametherm - Inrush Current Limiters and Thermistors

Surge-Gard Inrush Current Limiters

NTC Thermistors – Negative Temperature Coefficient (NTC) thermistors are thermally sensitive semiconductor resistors which exhibit a decrease in resistance as absolute temperature increases.

SURGE-GARD Inrush current limiting devices have specially formulated metal oxide ceramic materials. These devices are capable of suppressing high inrush current surges.

(AMETHERM Acquires SURGE-GARD Inrush Current Limiter Product Line from Measurement Specialties – October 1st, 2013)

Ametherm, Inc
961 Fairview Carson City Nevada 89701, USA

Murata Manufacturing – Electronic Components

In the 1940s radio was an important means of communication. Super heterodyne radio used Murata’s tubular 500pf ceramic capacitors with titanium oxide as dielectric material for temperature compensation.

Murata Manufacturing – Electronic Components

Products Include

Passive components like Capacitors, Resistors, Thermistors, Coils(Inductors), Delay Lines, Resonators, Noise Suppression Products and EMI Suppression Filters.

Audio Visual Parts like Spherical Speaker Products, Sound Components Filters, Modules for Audio Visual Equipment,

They also have Components and Modules for Communication Equipment. Special Sensors and Optical Products.

Reasons for requiring EMI suppression filters

Chapter 1 describes the reasons for using EMI suppression filters, and explains how shields and filters used for electromagnetic noise suppression work.

Bluetooth Smart module - Murata

Bluetooth Smart module TypeVZ is a plug-in device that supports Bluetooth 4.0 low energy standard. All protocol stacks required for Bluetooth low energy communication are built in and it enables the module to be easily controlled by 8-bit or 16-bit MCUs widely used in small embedded devices.