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September 21, 2012 - x

Original Press Release

Littelfuse Introduces TCMOV34S, SMOV34 and SMOV25 Series Varistor Lines

Press release date: September 11, 2012

New Varistor Lines Facilitate Compliance with 3rd Edition of UL1449

CHICAGO, IL – – Littelfuse, Inc., the global leader in circuit protection, today announced it had introduced TCMOV34S, SMOV34, and SMOV25 Series Varistor products designed to protect high energy circuits. The new TCMOV34S Series Varistor is a 34mm-square-format varistor that combines high maximum surge capability (40kA) with an integrated thermally active element. It is designed specifically to protect high energy circuits from the short circuit (SCCR) conditions and Abnormal Overvoltage Intermediate Current conditions specified in the 3rd edition of UL1449. In addition to suppressing voltage transients by clamping them to a safe level, the TCMOV34S Series Varistor is designed to disconnect itself from the circuit safely in the event of overheating due to abnormal over-voltage conditions. A built-in micro-switch can be used to indicate when the Varistor is disconnected from the circuit.

The TCMOV34S Series Varistor is designed to facilitate compliance with the 3rd edition of UL1449 for surge protection devices (SPDs). It offers a short circuit current rating of 200kA, as well as high peak surge current handling (up to 40kA) and high energy absorption capabilities. It can be wave soldered without the need for special or expensive assembly processes. It is also lead-free and RoHS-compliant.

The new Littelfuse SMOV25 and SMOV35 Series Varistor lines are 25mm- and 34mm-square MOV devices respectively. Each has a thermal disconnect designed to open in the event of overheating due to abnormal overvoltage as outlined in the 3rd edition of UL1449. The close proximity of the integrated thermal element to the MOV body ensures a quick thermal response. These devices have a separate micro-switch that can be used to indicate when the MOV is disconnected from the circuit. Both SMOV Varistor Series are designed to disconnect themselves safely from the circuit in a sustained over-voltage, limited current condition as outlined in the 3rd edition of UL1449. Their standard operating voltage range is compatible with common AC line voltage (115VAC to 750VAC).

Like the TCMOV34S Series, the SMOV25 and SMOV34 Series Varistor lines are designed to facilitate compliance with the 3rd edition of UL1449 for surge protection devices (SPDs). They offer high peak surge current handling and high energy absorption capabilities. They are also lead-free and RoHS-compliant.

Applications for all three Varistor lines include use in surge protection devices, AC panel protection modules, power transfer switches, AC/DC power distribution systems, photovoltaic systems, and cell phone base stations.

“These new Varistor lines offer our customers a wider range of options and is another example of our commitment to provide the broadest and deepest portfolio of circuit protection products,” said Littelfuse Product Manager Johnny Chang.

Littelfuse, the leader in Varistor technology, provides a comprehensive range of products and solutions that provide overcurrent protection for any electronic application. With more than 85 years of experience in building and supplying overcurrent protection products, Littelfuse is dedicated to providing application expertise and support that meets or exceeds customers’ needs.

Availability
TCMOV34S, SMOV34 and SMOV25 Series Varistor samples are available now for bulk orders; sample requests through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit littelfuse.com

For More Information
For more information about Littelfuse and its circuit protection products, please visit the Littelfuse Web site at littelfuse.com or contact the Littelfuse Technical Support line at 1-800-999-9445.

For circuit protection application design ideas, please visit the new Application Design Center section of the Littelfuse Web site.
If you have questions or require technical support, please contact the Littelfuse technical support hotline at 1-800-999-9445.

Technical Contact:
Johnny Chang
Global Product Manager, Surface Mount Varistors MOV
jchang@littelfuse.com

About Littelfuse
Founded in 1927, Littelfuse, Inc., the worldwide leader in circuit protection, offers the industry’s broadest and deepest portfolio of circuit protection products and solutions. Littelfuse devices protect products in virtually every market that uses electrical energy, from consumer electronics to automobiles to industrial equipment. In addition to its Chicago, Illinois, world headquarters, Littelfuse has more than 30 sales, distribution, manufacturing and engineering facilities in the Americas, Europe and Asia. Technologies offered by Littelfuse include Fuses; Gas Discharge Tubes (GDTs); Positive Temperature Coefficient Devices (PTCs); Protection Relays; PulseGuard® ESD Suppressors; SIDACtor® Devices; Silicon Protection Arrays (SPA™); Switching Thyristors; TVS Diodes and Varistors.  The company also offers a comprehensive line of highly reliable Electromechanical and Electronic Switch and Control Devices for commercial and specialty vehicles, as well as Protection Relays and underground Power Distribution Centers for safe control and distribution of electricity in mining operations.

For more information on Littelfuse, please visit www.littelfuse.com