For KNX and DALI type lighting controllers, C&K offers a wide range of tact switches. The KSR and KMR series tact switches come in compact low profile packages with gold contacts for corrosion resistance and operating life up to 300K cycles. For applications requiring higher cycle life and/or a high level of sealing, the standard KSC is rated to 1MM cycles and sealed to IP67. C&K also offers the PTS820 miniature tact switch and the larger PTS645 for more cost sensitive applications where gold contacts are not required. The PTS820 measures only 3.9 x 2.9mm and the PTS645 comes in a 6mm package.