DOLD - Measuring relays for
Voltage Monitoring

The DOLD measuring relays for voltage monitoring offer complete voltage protection for overload and
under-load monitoring in one compact device. The under-load and overload relays and voltage monitor
(single phase and three phase) protect consumers such as electric motors against overloading caused by
under-loads and/or protect devices against destruction caused by overloads e.g. generators running in
isolated operation with faulty regulation. An important area of use of this measuring relay is the
single phase voltage monitoring in control circuits or DC control circuits.