The STFE series DIN Rail Mount Surge Protector combines Active Tracking® technology, provides protection against the full spectrum of voltage transients and surges. It continuously tracks the input AC power line responding instantly into action upon detecting extraneous high frequency noise and high voltage transients caused by everyday events such as turning on machinery, motors or equipment. This device is designed to meet UL 1449, UL 1283, cUL recognized and CE. The STFE attenuates or reduces the amplitude of normal mode noise to a minimum of 90dB that occurs in a frequency range of 100kHz to 50MHz and of common mode noise to a minimum of 60dB that occurs in a frequency range of 5 to 50MHz. It is built to meet your unique requirements and is available in hardwired DIN rail mount, single phase configuration. It is designed for years of trouble free operation and require little or no operator intervention after installation.