single pole knife switch

机械英汉词典... ... single-pole fusing 单极熔断 single-pole knife switch 单极闸刀开关 single-pole relay 单极继电器 ...

机械专... ... single-pole double-throw 单刀双投，单刀双掷 single-pole knife switch 单刀闸刀开关 single-pole line 单杆线路 ...