The breakdown voltage range starts at 25.9V minimum, so the device begins conducting just above the nominal rail, shunting surge energy before downstream circuitry sees overstress. The DO-201AD axial package suits through-hole assembly on boards where leaded parts are preferred for thermal mass or serviceability.
onsemi lists the 1N6379RL4G as Obsolete.
The 1500W peak pulse power is the device's ability to absorb a single 10/1000 µs surge without failing. For a 24V rail, the 22V standoff means the TVS does not conduct during normal operation, while the 25.9V minimum breakdown ensures it triggers before the rail exceeds safe limits. If the downstream components are rated for 40V or higher, this TVS provides adequate margin; if the rail has 30V-rated parts, a lower-clamping alternative should be considered. With only one unidirectional channel, this part protects a single line. For bidirectional protection on AC or bipolar rails, two devices or a bidirectional TVS would be needed.