MIKRO MU250-415V • MU150 and MU250 are voltage relays that combine various protections and starting delay. • MU150 is used for single-phase monitoring while • MU250 is used for 3-phase monitoring. • Microprocessor based numerical relay • Undervoltage • Overvoltage • Delay-on • 2 voltage-free output contacts • Voltage and frequency display • ANSI Code : 27, 47, 59, 60 • 3-Phase • Unbalance • Phase loss • Phase sequence • With or without neutral connection • Phase to phase or phase to neutral monitoring