This is precisely the finished module I have subsequently ordered from ELV and expected installed successfully. I refer my problems with the construction not included in the rating; He who trusts in the assessment of his technical skills on consumer reviews, is probably to blame. The remaining comments relate accordingly to my experience with the finished module:
Positives:
+ Switching tasks directly on the FET can be done with the highest precision in the CCU software setting resolution of 0.01 seconds for the switching time - so that should stand rather lonely in the current actuators selecting the module well. However, if dry contacts necessary this accuracy is "watered down" by a downstream relay. Note also that this benefit applies only to the switching duration, not the shift timing, since the duration may vary with more than seconds tolerance until the completion of the radio transmission.
+ The threshold voltage for the low-battery notification can be set free in the configuration - very useful because, although the FET to 5.0V more reliable switches down, but a downstream relay possibly starting at 8.5 V not down more.
+ A switchable LED and a button on the board make function test and fault diagnosis quite comfortable. It would be desirable, of course, both when they are not soldered as SMDs but socketed and the housing front would be extended.
Negatives:
- The board is indeed gratifying kept small, but probably includes the vast majority of applications, switching the battery voltage, which also supplies the module to a consumer (usually relay or SSR). The realization of this circuit via cabling or grid board then eats the compactness advantages again. Desirable and even more comfortable a variable bridge circuit with dip switches would have been right on the board.
- The switch output is polarized. Therefore AC voltages can not turn right, even if potential freedom not required and the switching capacity is actually sufficient (eg what would be the case when strikes or jingles).
All in all a pretty useful actuator, which is the only possible choice in many applications. A more comfortable variant (especially with button mounted on the front panel, above) would be desirable, but there is in the HomeMatic system some urgent work sites.