IIMCL01
IIMCL01
IIMCL01
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(1)结构与用途
熔断器的结构一般分成熔体座和熔体等部分。熔断器是串联连接在被保护电路中的,当电路电流超过值时,熔体因发热而熔断,使电路被切断,从而起到保护作用。熔体的热量与通过熔体电流的平方及持续通电时间成正比,当电路短路时,电流很大,熔体急剧升温,立即熔断,当电路中电流值等于熔体额定电流时,熔体不会熔断。所以熔断器可用于短路保护。由于熔体在用电设备过载时所通过的过载电流能积累热量,当用电设备连续过载时间后熔体积累的热量也能使其熔断,所以熔断器也可作过载保护。
(2)类型
RC1A系列熔断器如图(a),它结构简单,由熔断器瓷底座和瓷盖两部分组成。熔丝用螺钉固定在瓷盖内的铜闸片上,使用时将瓷盖插入底座,拔下瓷盖便可更换熔丝。由于该熔断器使用方便、价格低廉而应用广泛。RC1A系列熔断器主要用于交流380V及以下的电路末端作线路和用电设备的短路保护,在照明线路中还可起过载保护作用。RC1A系列熔断器额定电流为5~200A,但极限分断能力较差,由于该熔断器为半封闭结构,熔丝熔断时有声光现象,对易燃易爆的工作场合应禁止使用。
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