Littelfuse SE-330-00-01 is a multi-functional relay with a range of features to ensure reliable protection in resistance grounded AC systems. It offers multiple relay contact configurations, fail-safe/non fail-safe operation, and harmonic filtering. The relay can be reset using a front-panel switch or remotely with a normally open contact. With a wide supply voltage range and multiple communication options, it provides flexibility for various applications. Rated for system voltages up to 5 kV and offering a GF trip level range of 2-100% of CT-Primary Rating, it meets a variety of requirements.