Hardware manual PCD1.M2220-C15 │ Document 27-640 – Version ENG03 │ 2020-03-25
Saia-Burgess Controls AG
Installation regulations and relay contacts
Appendix
A-6
A
The resistors used must withstand high voltages (pulse strength). Voltage flashovers
can arise on the production-related coil cut particularly for low-resistance values.
Fixed carbon resistors are therefore used for suppressors in particular. Enamelled
wire resistors, however, or cement resistors with a large coil pitch are also suitable.
Dimensioning aid:
The value for C results directly from the current to be switched. The value for the resistance R is
calculated by drawing a line through the corresponding points of the I and U curve and the resist-
ance is read at the point of intersection with the R curve.
Load
Example:
U = 100V
I = 1A
C is therefore 0.1
μF
R = 10
Ω (point of intersection with R-scale)