Abstract: The immersion heater for an appliance includes a mounting plate, a metal sheathed electrical resistance heating element having two end portions which extend through and which are secured to the mounting plate, and a single fastening device for fixing the mounting plate to the body shell of the appliance. The fastening device comprises a threaded heat conductive stud secured to the mounting plate and a nut having a complementary thread. A raised part of the active portion of the heating element is directly secured to and only to the stud, such as by brazing. A bimetallic element is fixed directly to the stud on the outside of the body shell. The stud provides a heat conductive path between the heating element and the bimetallic element. The bimetallic element bends when the appliance is energized `dry` or when the liquid has boiled down to the element and pushes a dolly overcenter to open a pair of contacts and de-energize the heating element.

Abstract: The appliance, e.g. an electric kettle has a body shell, a heating element within the body shell and having two ends which project through the body shell to the outside thereof, and a switch housing mounted on the outside of the body shell. A pair of switching contacts are opened and closed by a switch operating member or dolly. One of the switching contacts is movable by the dolly and is supported relative to the housing. The other switching contact is a fixed contact and is provided at one end of the heating element.

Abstract: The appliance, e.g. an electric kettle, has a body shell, a heating element within the body shell and a switch housing mounted on the outside of the body shell. A switch operating member or dolly is supported relative to the switch housing and is operable to open and close a pair of switching contacts for interrupting and making respectively an electrically conductive path, which includes the heating element, between a pair of terminal pins. The dolly can rock about a pivot between two positions and is urged against the pivot by a leaf spring acting between the dolly and a support. The housing includes the pivot and the support and is formed as an integral plastics moulding.