| 摘要 |
<p>An electric immersion heater comprises an element (1) having a cold tail (27) of a material having a high thermal conductivity such as copper. The cold tail (27) directly mounts a bimetallic actuator (32) which by virtue of heat transmitted along the cold tail (27) from the element (1) operates a switch in the event of the element overheating. The actuator (32) preferably carries a contact (37) of the switch. Preferably the cold tail (27) is formed with a portion (30) providing an enlarged surface contact area between the cold tail (27) and the actuator (32). Actuators (32) may be mounted on both cold tails (27) of the element to operate respective switches.</p> |
