较简单的开关有二片名叫“触点”的金属，二触点接触时使电流形成回路，二触点不接触时电流开路。选用接点金属时需考虑其对抗腐蚀的程度，因为大多数金属氧化后会形成绝缘的氧化物，使接点无法正常工作。选用接点金属也需考虑其电导率、硬度、机械强度、成本及是否有毒等因素。
有时上海祥树HBMZ6FC3 200KG会在接点上电镀抗腐蚀金属。一般会镀在接点的接触面，以避免因氧化物而影响其性能。有时接触面也会使
上海祥树HBMZ6FC3 200KG
上海祥树HBMZ6FC3 200KG
延时开关是使用电子元件继电器安装于开关之中，延时开关电路的一种开关。延时开关又分为声控延时开关、光控延时开关、触摸式延时开关等。延时开关的原理就是电磁继电器的原理，继电器的工作原理是，当继电器线圈通电后，线圈中的铁芯产生强大的电磁力，吸动衔铁带动，使触点1、2断开，1、3接通。当线圈断电后，弹簧使复位，使触点1、2接通，1、3断开。我们只要把需要控制的电路接在触点1、2间（1、2称为常闭触点）或触点1、3间（称为常开触点），就可以利用继电器达到某种控制的目的
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WESTCODE 069UR2S1000B
SCHMERSAL G50-025M22/22Y-1600-1-1368-3-FL2
GRUBER CRM-41H 延时继电器
LEGRAND 035312
MAHLE PI 73010 DN PS VST 10 77925670
BEKA BA307E
ISOLOC STZE M24X1.5X100-NR.72150-ISOLOC
BRINKMANN TA302/400-6165+019 1114021239-74046 001
CROUZET 81506920
STEINEL Fuehrungssaeule mit Bund ST 9825_063x355 M12
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BRINKMANN 1KTF151/370+001
FREUDENBERG A70X90X10 制作标准：DIN3760 材质：FPM/FKM
BRAUN E1667-10375396 rev.1 SEL3/IEC61508
