Abstract: An electrical apparatus (1) comprising a base (2) for being attached to a substrate (4), a functional head (3) which has at least one electrical or electronic functional device (10), wherein the functional head (3) is attached to the base (2) with a bayonet connection (6), wherein the base (2) has a first contact (14) and the functional head (3) has a second contact (30), which are contact-connected to one another, wherein the bayonet connection (6) can be formed by a relative movement of the functional head (3) in relation to the base (2) in an axial direction (A), and a subsequent relative rotation, and the first contact (14) and second contact (30) can be contact-connected to one another by the relative rotation.

Abstract: The present invention relates to a fire alarm 1 that includes a base 1.5 and a fire alarm insert which can be connected to base 1.5. A covering cap 3 and a sheet 2, 2.1 located between the covering cap 3 and the fire alarm insert 1.1 are provided to cover fire alarm insert 1.1.

Abstract: A fire detector including a base and a fire detector insert connectable to the base. The fire detector insert is connectable to the base by an axial movement and detachable from the base by a subsequent axial movement.

Abstract: A fire detector including a base and a fire detector insert connectable to the base. The fire detector insert is connectable to the base by an axial movement and detachable from the base by a subsequent axial movement.

Abstract: A fire alarm for an installation via a housing that is flush with the ceiling, having at least one light source arranged in the housing and at least one light receiver arranged in the housing, as well as a shutter disk, which seals the housing. To prevent the spreading of stray light between the light source and the light receiver via the shutter disk, a shield, for example, is provided in the shutter disk to suppress or absorb stray light.

Abstract: The present invention relates to a fire alarm 1 that includes a base 1.5 and a fire alarm insert which can be connected to base 1.5. A covering cap 3 and a sheet 2, 2.1 located between the covering cap 3 and the fire alarm insert 1.1 are provided to cover fire alarm insert 1.1.

Abstract: A fire alarm for an installation via a housing that is flush with the ceiling, having at least one light source arranged in the housing and at least one light receiver arranged in the housing, as well as a shutter disk, which seals the housing. To prevent the spreading of stray light between the light source and the light receiver via the shutter disk, a shield, for example, is provided in the shutter disk to suppress or absorb stray light.