Defines the possible sealing types for a terminal, if the terminal shall be sealed in its usage.
The Terminal can not be sealed by itself (e.g. a CavitySeal)
The Terminal can be sealed and can only be used together with a cavity seal. It is not allowed to be used unsealed.
The terminal can be sealed (with a cavity seal), but a seal is not mandatory for this terminal.
The terminal can be used in a moulded slot.