What is an RCD and why is it necessary in an electrical installation?
RCD is an abbreviation of the English term “Residual Current Device”. In Germany, RCDs are called fault current protection switches or FI protection switches. An RCD is a switch that can interrupt the circuit electromagnetically. This is necessary if, for example, fault current flows through a person due to an insulation fault.
The switching knob on the MCB is in the middle. The MCB can be prevented from being turned back on simply by pushing hard on the switching knob. What has happened?
The MCB has a RESET position, i.e. in the case of an overload or short circuit, the switching knob jumps to the middle position (RESET). Thus, the device indicates an error in its circuit itself, which lead to it being triggered.
After removing the fault, press the knob down until it clicks into position; the switch knob can then be moved to the ON position again.
What is the adjustment screw in surge current switch Art. No. 1902... for UP-socket for?
The circuit of the consumer can also be switched ON or OFF from there. Switch position is visible (0/I)
What is the difference between the B + C characteristics in the case of MCB?
The difference between B and C characteristics is in the area of the course circuit actuator. While the B characteristic triggered at 3-5 times the value of the rated current, the value for the C-characteristic changes to 5-10 times the value. This makes the C characteristic particularly suitable in areas where high inrush currents flow (e.g. circular saws, motors, etc.). The B characteristic is the standard for house installation in Germany.