Its 600 W peak pulse power rating (10/1000 µs waveform) translates to a 6.7 A peak pulse current capability, which is enough to absorb the energy from a typical inductive load dump or lightning surge on a 48 V telecom bus without letting the voltage exceed 93.6 V at the clamp point. The 64.4 V minimum breakdown voltage gives a guard band above the 58 V standoff, so the part stays out of conduction during normal operation and only fires when a transient pushes past the threshold.
Temperature range and package — where it fits
No power-line protection claim (the part is not designed for AC mains), but for DC rails up to 58 V it is a straightforward clamp.