Sepam series 20, 40.80 Suitable for common applications, Sepam series 20 offers simple solutions based on current or voltage metering. b protection of substation incomers and feeders against phase-to-phase and phase-to-earth short-circuits v 16 IDMT tripping curves v adjustable timer hold to detect recurrent faults v switching of groups of settings to adapt to changes in the network configuration b protection of overhead lines with built-in recloser function b protection of transformers against overloads, with ambient temperaturecompensated RMS thermal overload protection with 2 groups of settings for different ventilation operating rates b protection of motors v against overloads, with ambient temperature-compensated RMS thermal overload protection with a cold tripping curve that can be adjusted to fit motor characteristics v against internal faults and load-related faults v with motor starting condition monitoring and machine operation assistance. The Sepam series 20 B21 and B22 voltage units are suitable for the following situations: b monitoring of network voltage and frequency b loss of mains detection by rate of change of frequency protection for installations with local power generation.