Abstract: A circuit for monitoring a plurality of analog quantities which provides signals for exceeding of threshold values and utilizes a differential amplifier. One input of the differential amplifier is connected to a reference voltage source and the other input is connected to a reference resistor. The quantities to be monitored are represented by voltages or by impressed currents that are supplied to the input of the differential amplifier which is connected to the reference resistor and supplied thereto via decoupling diodes and coupling resistors. A plurality of coupling resistors are connected with reference resistor to form a single voltage divider whose taps receive the representative voltages or, impressed currents and are supplied in graduated steps according to values of the allocated threshold values.