Thermal protection device
AssigneeTDK Electronics Co., Ltd.
InventorsWen Yang, Xiaojia Tian, Zhouquan He, Yongde Huang
Life of this patent
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Abstract
In an embodiment a thermal protection device includes a housing, a varistor partly embedded in the housing, wherein the housing electrically insulates the varistor, and wherein the varistor includes a partly uninsulated contact surface, an inner wall of insulating material arranged adjacent to the contact surface of the varistor, a window in the inner wall configured to allow an electrical connection of the contact surface of the varistor in an operational state of the thermal protection device and a moveable insulation block configured to cover the window in the inner wall to insulate the varistor in a region of the window of the inner wall in a fault state of the thermal protection device.
Claims12
A thermal protection device comprising:
- a housing;
- a varistor partly embedded in the housing, wherein the housing electrically insulates the varistor, and wherein the varistor comprises a partly uninsulated contact surface;
- an inner wall of insulating material arranged adjacent to the contact surface of the varistor;
- a window in the inner wall configured to allow an electrical connection of the contact surface of the varistor in an operational state of the thermal protection device;
- a moveable insulation block configured to cover the window in the inner wall to insulate the varistor in a region of the window of the inner wall in a fault state of the thermal protection device, wherein the moveable insulation block is configured to move in a rotation around a rivet in a center of rotation;
- a metal contact defining a spring terminal such that the spring terminal is electrically connected through the window to the contact surface of the varistor during the operational state of the thermal protection device;
- and
- an indicator configured to signal a current state of the thermal protection device,
- wherein the indicator comprises an indicator trigger, and
- wherein the moveable insulation block is configured to press the indicator trigger when the moveable insulation block is moved in its end position in the fault state of the thermal protection device thereby operating the indicator trigger of the indicator.
A thermal protection device comprising:
- a housing;
- a varistor partly embedded in the housing, wherein the housing electrically insulates the varistor, and wherein the varistor comprises a partly uninsulated contact surface;
- an inner wall of insulating material arranged adjacent to the contact surface of the varistor;
- a window in the inner wall configured to allow an electrical connection of the contact surface of the varistor in an operational state of the thermal protection device;
- a moveable insulation block configured to cover the window in the inner wall to insulate the varistor in a region of the window of the inner wall in a fault state of the thermal protection device;
- and
- an indicator configured to signal a current state of the thermal protection device,
- wherein the indicator comprises an indicator trigger,
- wherein the moveable insulation block is configured to press the indicator trigger when the moveable insulation block is moved in its end position in the fault state of the thermal protection device thereby operating the indicator trigger of the indicator, and
- wherein the thermal protection device is configured such that, with an accurate application of heat, a low temperature solder joint between a spring terminal and the contact surface is rebuildable after triggering of the thermal protection device so that the thermal protection device is resettable to the operational stats.
Dependencies are inferred from the claim text.