Littelfuse PGR-3200-120 is an optional conformally coated, non fail-safe relay with a frequency range of 50-60 Hz. It operates on a 120V AC supply voltage in an ungrounded AC system. With IEEE device numbers 27-64, a latching or autoreset feature, and a front-panel test button, it ensures reliable performance. Insulation resistance warnings are triggered at 50 and 30 kOhms, with an alarm at 10 kOhms.