Siemens SIPLUS HCS Operating Instructions Manual page 31

Restriction of the switching power when operating without soft start
Due to the different physical properties of heating elements, restrictions can be imposed on
their permissible switching capacity depending on the type of heating element.
Short-wave halogen or infrared emitters ("flash heating elements") have a high starting
current due to their relatively low cold resistance. The starting current can be several times
the rated current, especially during the first half waves.
Overloading of the internal fuses of the POM can occur depending on the number of
switching operations as well as the duration of switching operations and pause times.
NOTICE
Restriction of the switching power
When using flash heating elements with outputs
• above 750 W at 230 V AC for POM low-end or
• above 1600 W at 230 V AC for POM mid-range,
switching operations can result in extremely high currents which trigger the channel fuses.
We therefore recommend that you have these heating elements gauged by Siemens AG.
Derating of fuses
Note that fuses are subject to derating at high ambient temperatures, i.e. the rated current
for a fuse is reduced.
SIPLUS HCS4200
Operating Instructions, 11/2015, A5E35066204A/RS-AA/002
Application planning
4.5 Performance profile of the POM4220
31