Art-Nr.: DA07002B
Differenzstrommonitoring RCMB70
Variable residual current monitor of type B7B + for measuring DC and AC residual currents up to 100 kHz with analog 4-20 mA and relay output. Residual current and frequency current and frequency range as well as integration time are flexibly adjustable.
Features
- 70 mm inner diameter
- DC and AC residual current measurement of type B/B+
- in the range from 0-2 Arms to 100 kHz
- Selectable by the user: Rated residual current Frequency range Integration time Analog 4-20 mA and relay output Fluxgate current measurement technology with fixed excitation frequency for improved accuracy and stability
- Residual current monitoring in industry
- Condition-based monitoring of insulation status
- Replacement / supplement to insulation testing (part of the repeat test according to DGUV Regulation 3)
A residual current protective device (RCD – formerly FI protective device) has been a standard component in electrical sub-distribution for many decades. An RCD is also located in our home. This switch has a rated residual current of 30 mA. Normatively, tripping is defined between 50 and 100 % of the rated residual current. When a 30 mA RCD trips, a residual current between 15 and 30 mA must therefore be present. The threshold of 30 mA is intended to ensure personal protection, which is required wherever freely accessible sockets are available.
In the industrial environment, in addition to administrative buildings that are protected with 30 mA RCDs, we usually find larger machines that are used for production. Even if these machines do not have any freely accessible sockets, protection via RCDs would also be advisable. A system defect can lead to electrically ignited fires. It might also be possible to prevent greater damage to the system if a smaller defect could be detected at an early stage. However, a major disadvantage of protecting systems with an RCD is then an unpredictable sudden shutdown of the system. An uncontrolled and unexpected system shutdown can quickly result in costs amounting to a five- to six-figure sum in some industrial sectors.
Residual current monitors provide a remedy by allowing the residual current to be measured. An increase in residual current can be detected and reported at an early stage via residual current monitors. Controlled shutdowns thus allow maintenance measures to be better coordinated. System availability can be increased. The probability of a production failure decreases.
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