single-pole double throw

航海及... ... single-pole circuit breaker 单极断路器 single-pole double throw 单刀双投 single-pole single throw 单刀单投 ...

机械英汉词典（S-7）-机械资讯-马棚网 ... single-pole cut-out 单极断路器 single-pole double throw 单刀双掷，单刀双投 ...