The 203-2-1-52-153-6-1-6 is a Type 203 supplementary protector designed for DC long delay protection with inverse time delay characteristics and a nominal delay time of 1.50 seconds. This liquid-handled magnetic supplemental protector features a rocker handle construction with auxiliary switch capability and center tap configuration. The device provides DC long delay (code -52) operation with impedance characteristics specified across DC, 60 Hz, and 400 Hz frequencies as detailed in the resistance/impedance chart. With current ratings available from 50 amperes to 500,000 amperes and standard tolerances of ±0.015 inches (±0.38 mm) on dimensions and ±5° on angles, this protector is suitable for industrial power protection applications requiring reliable supplementary overcurrent protection with time-delay coordination.