It's a universal-current device, meaning it handles both 440 V DC (rated) up to 500 V DC maximum, and 400 V AC, with a breaking capacity of 10 kA per IEC 60947-2 at DC. This specific variant is designed for railway applications, which is reflected in its construction and environmental ratings. At 1.6 A, it's a fine overcurrent and short-circuit protector for a DC auxiliary circuit or a small AC control transformer on a railcar or wayside cabinet.
The terminals accept solid or stranded wire from 0.75 to 35 mm², with a screw-type tightening torque of 2.5 to 3.5 N·m (22 to 31 lbf·in). Both top and bottom terminals are combined (line/load reversible), and the unit is sealable for tamper-proofing. Rated IP20 with conductors connected, which is standard for enclosed panel gear. Touch protection is built in. Polarity must be observed on the DC supply side — it's not polarity-agnostic.
This is a current-production part (lifecycle stage: current). Humidity influence is derated: max 95% RH up to 55 °C, then down to 55% at 70 °C and 35% at 75 °C.