The 209-1-1-52-2-9-100 is a single-pole E-frame hydraulic magnetic circuit protector designed for branch circuit applications including EDP, air conditioners, panel boards, and lighting controls. This unit features a solderless front connector terminal with front panel mounting and incorporates a medium DC delay (Delay 52) for coordinated protection with mixed loads. The breaker is rated for up to 100 amperes at 240Vac or 125Vdc, with a nominal DC resistance of 0.0008 ohms at 100 amps. The compact single-pole design measures 1.026 ± 0.010 inches (26.06 ± 0.25 mm) in width, making it suitable for space-constrained installations. This configuration provides reliable power switching and accurate circuit protection in a compact unit ideal for industrial and commercial applications requiring medium-delay inverse time characteristics.