User Manual

3UG4 / 3RR2 monitoring relays

Manual, 02/2013, NEB927043002000/RS-AA/002

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3UG463. voltage monitoring relay

11.1 Application areas

Application areas

The voltage monitoring relays are used, for example, in the following applications:

Table 11- 1 Application areas of the voltage monitoring relays

Function Application

• Undervoltage

• Overvoltage

• Increased current on a motor with corresponding overheating

• Unintended device reset

• Power system collapse on overloaded supply voltages

• Fork-lift trucks

• Heating systems

• Cranes

• Elevators

• Protection from undervoltage (especially with battery power; result:

e.g. exhaustive discharge)

• System protection against destruction caused by supply overvoltages

• Energy supply to the line

• Machine switch-on when a defined voltage is reached

• Threshold switch for analog signals from 0.1 to 10 V