Face & Plug Seal Kits for IEC 60320 C14 Inlets with IP54 Rating From: Interpower
The IP54 rating prevents corrosive dust and solid particles from reaching the terminals while preventing liquids from short circuiting the terminals.
Interpower Oskaloosa Particle Protection Liquid Ingress Protection Tests Face Seal Kit Plug Seal Kit Ingress Protection
Source: manufacturing.net