Patent ID: 6584280
Filing Date: 2003-06-24
Classification: A01K,H05B

Abstract:
An aquarium heater comprising:a glass tube having a top opening, housing a circuit board and a heating coil and a protective elastic strip switch; said heating coil being connected to the circuit board; a first protective device defining a control circuit contained within the circuit board including a temperature sensor for sensing water temperature in said aquarium, and a comparison circuit for comparing temperature, means for generating a voltage to an output lead when said temperature sensor measures an aquarium temperature below a predetermined value, and substantially zero voltage to said output lead when said temPerature sensor measures said aquarium temperature above said predetermined value; and, a second protective device defining an electrically conductive elastic strip switch coupled to said control circuit at a first end thereof and a second end thereof being displaceable (1) into electrical contact with said heating coil when said temperature sensor measures a temperature below said predetermined value, and (2) out of electrical contact with said heating coil when said temperature sensor measures said aquarium temperature above said predetermined value, whereby circuit operation is cut-off when an overload or over-heated condition is determined.