Membrane switches circuits have two connections type

Interconnect

The flexible tail that exits a membrane switch usually has single row traces on .100" centers. This tail can be connected to a circuit board with many different single row connectors designed for flex circuits. JCF technology is tooled to crimp CJT,AMP and Molex connectors onto flex circuits.
This is a female single row connector with contacts on .100" centers. The contacts are specified separately from the housing. The flex circuit can also be terminated with solder tabs that can be directly soldered onto the circuit board. The lowest cost alternative is to use a ZIF (Zero Insertion Force) connector. When using a ZIF connector the membrane switch is shipped with exposed contacts on the end of the tail. The customer then inserts the tail into the ZIF connector. ZIF connectors are available with locking mechanisms in both .100" and .050" centers. When using a ZIF connector, you should specify either the connector or the requirements for the connector. Screen Printed Flex Circuits The typical flex circuits used in membrane switches are made with screen printed silver-filled epoxy ink. The process is carefully controlled to insure maximum conductivity, adhesion, and flexibility. This type of circuit does not utilize feed thrus, so circuits are single sided. Traces can cross through use of a dielectric crossover. This increases the number of printing operations, and consequently increases cost. A dielectric material is screen printed in the area the trace will be crossed over, and then silver jumpers are printed on top of the dielectric.
1.Creasing of Flex Circuits membrane switch
In many applications the tail of a membrane switch keypad needs to be bent at or near the exit point. Extreme caution should be exercised when bending flex circuits. While it is likely that continuity will be maintained in a trace that is creased sharply, the trace will most likely be damaged, and be a potential area of future failures. It isrecommended that a .010" radius be used to wrap the flex tail around if a bend needs to be put into the tail. A folded piece of card stock works well. It is also possible to have Holland Nameplate form the tails with a bend to a customer’s specification. This allows JCF technology to inspect and test the parts after the bend is in the tail. when a crease is going to be put into the tail of a membrane switch, so that this fact can be taken into consideration during design.
2.Rigid Membrane Switches
It is often desirable to build a membrane keypad onto a rigid circuit board instead of using screen printed flex circuits. This construction provides a rigid panel, and allows for the easy addition of other components, such as LEDs and resistors. These types of membrane switches are usually supplied with a standard header with pins on .100" centers.