Provided is an electromagnetic relay which does not require a braided wire for securing a current capacity of a main contact unit. Said filter cassettes are cost-effective to produce as they have few connections and simple clamping plates and are characterized by a long service life and by being highly flexible in adapting their capacity to the desired cross-flow filtration performance. Each LED die has at least two electrical contacts on one surface thereof, and each electrical contact is electrically connected to a conductive element by a conductive adhesive. The said controller assembly is positioned radially outward from the stator assembly and located in at least one of the at least two extension portions. The resistor is externally coupled to the IC chip.