Littlefuse Introduces New LST Varistor Series

March 09, 2021

News

Littelfuse introduced the LST Varistor series.

Constructed with a proprietary thermally protected varistor technology (TMOV) developed by Littelfuse, this new varistor incorporates both a built-in thermal disconnect function and electric arc shield. This provides additional robust protection to prevent catastrophic failure and fire hazard under the extreme circumstances of abnormal overvoltage conditions or varistor end-of-life.

It is specifically designed for Type 1 and Type 2 Surge Protective Devices (SPDs) used in markets and applications including:

• Residential, Commercial, and Industrial buildings

• Uninterruptable Power Supply (UPS)

• Industrial motor control

• Renewable energy

• HVAC system

Benefits per a company press release include:

• Facilitate meeting UL1449 listed Type 1 or Type 2 standards by incorporating 200 kA SCCR, 20 kA In, UL1449 Type 4 recognized component assembly.

• Flexibility of using 50 kA and 75 kA Imax rated devices with the same footprint on PCB.

• More options for designing remote indication/monitoring of SPD product or system via mechanically triggered AC and DC rated microswitch (Normally Open/Normally Closed, pin length, 2 pin/3 pin/without pin).

• Clear LST working status indication via a visual tab option that notifies service technicians and maintenance engineers to replace LST at end-of-life (EOL) in order to continue optimal surge protection for the end-product.

• Wide Operating Voltage Range: Up to 690 Vac for 50 kA version, up to 550 Vac for 75 kA version.

For more information, visit littelfuse.com