Lamp Load
Lamp loads consist e.g. by light bulbs, starting motors .
WARNING: High current spikes at switching on, because the glowing spiral has low
resistance at low temperature.
Protective measures: (examples)
Limitation of current by a resistor
or preheating of the glowing
spiral.
Connecting to a PLC
There is no need for protective measures by connecting the Reed switch to a PLC. The
Reed contacts are plated by Tunsten, Gold, and Rhodium located in a protective atmo-
sphere. They can be directly connected to the input terminals of a PLC without problems.
RC-Circuits as protective measures (Boucherot cell, Snubber)
In practice the following values of resistor/capacitor cells give good results. Nevertheless,
the values given in the following tables are only recommendations for general purposes.
But it cannot be guaranteed that for specific applications more adequate Boucherot cells
may exist.
For Reed switches of 10 – 40 VA
Voltage [V]
Resistance [Ohm]
Capacitance [nF]
230
1500
330
115
470
330
48
220
330
24
100
330
For Reed switches of 40 – 100 VA
Voltage [V]
Resistance [Ohm]
Capacitance [nF]
230
1000
330
115
470
330
48
100
330
24
47
330
DS04 Instruction manual 03/2020
page 7