Tamura/NEC SF 金属外壳 15A 温度保险丝

AUPO的工作原理 / 田村 / NEC SF热熔断器基于材料的热膨胀和导电特性. 当电路中的温度升至熔断器的额定触发温度时, 保险丝的金属材料会因受热而膨胀. 当这种扩张达到一定程度时, 会导致保险丝内部电阻急剧上升. The increase in resistance will cause the fuse to heat up rapidly, further accelerating the expansion of the metal material. When the expansion reaches a certain degree, the fuse will disconnect in the circuit, thereby protecting the circuit and equipment from damage due to overheating.

正常情况下, when the current passes through the thermal fuse, the fuse will maintain a low resistance state and will not affect the circuit.

When overheating occurs in the circuit, the thermal fuse begins to work. Its metal material expands due to heat, causing the resistance inside the fuse to change.

As the resistance rises, the fuse temperature rises further, accelerating the expansion of the metal material.

When the metal material expands to a certain extent, the resistance inside the fuse will rise sharply, causing the current in the circuit to be cut off.

After the fuse is disconnected, a new fuse needs to be replaced to restore the normal operation of the circuit. This is because it is difficult for the metal material to return to its original state after expansion, so that the resistance always remains high.

2. Structural features
Thermal fuse is a temperature sensing circuit cutting device with the characteristic of one-time fusing, 那是, it only acts once at the fusing temperature and cannot be used again. Common types of thermal fuses include organic thermal fuses and alloy thermal fuses.

Taking the organic thermal fuse as an example, its structural features mainly include components such as temperature sensing block, compression spring and star spring. When the temperature around the organic thermal fuse rises to its operating temperature, the temperature sensing block will melt, and the compression spring will relax to make room, so that the star spring is pushed away to contact the pin, thereby disconnecting the current path. 这样, the circuit will be permanently cut off.

Product Features of Thermal Fuse
SEFUSE temperature fuse installation precautions:
1. 使用引线弯曲时, 它应该从一个零件弯曲超过 6 距离根部毫米; 弯曲时, 不要损坏根部和引线, 并且不要拉, 按, 或用力扭转引线.
2. 当温度保险丝用螺钉固定时, 铆接或接线柱, 应能防止机械蠕变和接触不良.
3. 连接件应能在电气产品工作范围内可靠工作，不因振动、冲击而产生位移.
4. 焊接引线时, 加热湿度应限制在最低限度, 并且温度保险丝不应承受高温; 请勿强行拉扯, 按, or twist the thermal fuses and leads; after soldering, cool down immediately for more than 30 秒.
5. 热熔断器只能在规定的额定电压条件下使用, 当前和指定温度. Pay particular attention to the maximum continuous temperature that the thermal fuse can withstand.
笔记: 标称电流, lead length and temperature can be designed according to customer requirements.

LE series Thermal Fuse (15A)

产品特点

Using temperature fuse metal casing and sense temperature organic particles.
属于不可恢复型温度保险丝. 温度保险丝熔断, 即使周围温度下降, 它不会被打开.
无铅 (铅) 和镉 (光盘), 并符合RoHS指令.
REACH不包含指定的 46 类别 SVHC (高度关注物质).

产品尺寸

250V 15A Temperature fuse