High voltage fuse, over voltage protection, short circuit protection

The PSK-S25B (PSK-S60B) series is a family of encapsulated ac-dc power supplies housed in a compact, board mount package. Outputting 25 W (60 W) of continuous power, these single output, encapsulated modules feature 3 kVac isolation and a wide operating temperature range from -30 to 70°C, making them ideal for space-constrained, low power ITE, industrial, and consumer electronic applications

https://www.futureelectronics.com/npi/cui-psk-s25b-psk-s60b-ac-dc-power-supplies