限位开关是一种常用的小电流主令电器。利用生产机械运动部件的碰撞使其触头动作来实现接通或分断控制电路，达到一定的控制目的。通常，这类开关被用来限制机械运动的位置或行程，使运动机械按一定位置或行程自动停止、反向运动、变速运动或自动往返运动等。
在电气控制系统中，限位开关的作用是实现顺序控制、定位控制和位置状态的检测。用于控制机械设备的行程及限位保护。构造:由操作头、触点系统和外壳组成。
行程开关主要用途:
主要用于机床及其他生产机械、自动生产线的限位和程序控制。
起重设备用
行程开关系列。主要用于限制起重设备及各种冶金辅助机械的行程。
结构
限位开关，指为保护内置微动开关免受外力、水、油、气体和尘埃等的损害，而组装在外壳内的开关，尤其适用于对机械强度和环境适应性有特殊要求的地方。形状大致分为横向型、竖向型和复合型。
起重机限位开关（以下简称限位开关），本产品主要用于交流50HZ、60HZ，额定工作电压至380V，直流额定工作电压至220V的控制电路中，用以限制起重机旋转运动机构的工作转角和进行顺序控制。
在实际生产中，将限位开关安装在预先安排的位置，当装于生产机械运动部件上的模块撞击行程开关时，限位开关的触点动作，实现电路的切换。因此，行程开关是一种根据运动部件的行程位置而切换电路的电器，它的作用原理与按钮类似。
T2C 422-01Y
T2C 422-10Y
T2C 422-10Y-T
TD 422-01Y-1090/2512
TD 422-01Y-1801/2512-1
TD 422-01Y-2512
TD 422-01Y-2512-10
TD 422-10Y-1801/2512-1
TD 422-10Y-2512
TD 422-10Y-2512-10
TJ 422-01Y
TK 422-01Y
TK 422-01Y-Q
TK 422-01Y-T
TK 422-01Y-U180
TK 422-10Y
TK 422-10Y-T
TL 422-01Y-1090/2512-6
TL 422-01Y-2512-16
TL 422-01Y-2512-6
TL 422-01Y-T-2512-6
TL 422-01Y-U180-2512-6
TL 422-10Y-T-2512-6
TL 422-10Y-U180-2512-6
TR 422-01Y
TR 422-01Y-PG
TR 422-01Y-T
TR 422-01Y-T-PG
TR 422-10Y
TR 422-10Y-PG
TR 422-10Y-T
TR 422-10Y-T-PG
TS 422-01Y
TS 422-01Y-T-M20
TS 422-10Y
TS 422-10Y-T
441系列
M. 441-11Y-1224
M. 441-11Y-M20-243
M. 441-11Y-T-1276-1
M. 441-11Y-T-1276-2
M. 441-11Y-T-1276-2/1801
M. 441-11Y-T-1801
M2S 441-11Y
M2S 441-11Y-T
MD 441-11Y-2512
MD 441-11Y-2512-10
MD 441-11Y-T-2512
MJ 441-11Y
MJ 441-11Y-T
MK 441-11Y
MK 441-11Y-T
ML 441-11Y-2512-16
ML 441-11Y-2512-6
ML 441-11Y-T-1276-2/1801/2512-7
ML 441-11Y-T-1801/2512-7
ML 441-11Y-T-2512-6
ML 441-11Y-U180-2512-6
MR 441-11Y
MR 441-11Y-T
MR 441-11Y-T-1276-2
MS 441-11Y-M20
MS 441-11Y-T
MS 441-11Y-M20-1276-1
T. 441-11Y-1224
T. 441-11Y-1801
T. 441-11Y-966
T. 441-11Y-M20-243
T. 441-11Y-T-1276-2/1801
T. 441-11Y-T-1649
T. 441-11Y-UE-T-M20-316
T. 441-11Y-T-1801
T. 441-11Y-UE-1224
T. 441-11Y-UE-243
T. 441-11Y-UE-243/8022-2
T. 441-11Y-UE-966
T. 441-11Y-UE-T-M20-316
T2C 441-11Y-M20
T2S 441-11Y-T
TD 441-11Y-2512
TD 441-11Y-2512-10
TD 441-11Y-T-2512
TJ 441-11Y
TK 441-11Y
TL 441-11Y-T-1276-2
TK 441-11Y-T-M20
TL 441-11Y-2512-16
TL 441-11Y-2512-6
TL 441-11Y-T-1276-2/1801/2512-7
TL 441-11Y-T-1649/2512-6
TL 441-11Y-T-1801/2512-7
TL 441-11Y-T-2512-6
TR 441-11Y-M20
TR 441-11Y-T-M20
TS 441-11Y
TS 441-11Y-T
TS 441-11Y-UE-M20
TL 441-11Y-T-1801
452系列
T.452-02y
Z/T235系列限位开关
AZ235-11Z,ZR235-11Z,TS235-11Z,TR235-11Z,TS235-20Z,TR235-20Z,
TS235-02Z,TR235-02Z,
Z4S235-11Z,Z4R235-11Z,ZK235-11Z,T4S235-11Z,T4R235-11Z,TK235-11Z,
T4S235-20Z,T4R235-20Z,TK235-20Z,T4S235-02Z,T4R235-02Z,
TK235-02Z,ZV12H235-11Z,ZV14H235-11Z, TV12H235-11Z,
TV14H235-11Z,TV12H235-20Z,TV14H235-20Z,TV12H235-02Z,
TV14H235-02Z,ZV10H235-11Z,Z3K235-11Z, TV10H235-11Z,
T3K235-11Z, TV10H235-20Z,T3K235-20Z,
TV10H235-02Z,T3K235-02Z,Z4K235-11Z,ZK4235-11Z,T4K235-11Z,
TK4235-11Z,T4K235-20Z,TK4235-20Z, T4K235-02Z,TK4235-02Z
松岛限位开关MGL-5100、MGL-5101、MGL-5102、MGL-5103、MGL-5161、
MGL-5163、MGL-5191、MGL-5193 、MGL-5210、MGL-5211、MGL-5530、
MGL-5531、
Z/T236系列限位开关
ZS236-11Z,ZR236-11Z,
TS236-11Z,TR236-11Z,
TS236-20Z,TR236-20Z,
TS236-02Z,TR236-02Z,
Z4R236-11Z,ZK236-11Z,
T4R236-11Z,TK236-11Z,
T4R236-20Z,TK236-20Z,
T4R236-02Z,ZK236-02Z,
ZV1H236-11Z,Z1R236-11Z, TV1H236-11Z,T1R236-11Z,
TV1H236-20Z,T1R236-20Z, TV1H236-02Z,T1R236-02Z,
ZV10H236-11Z,Z3K236-11Z, TV10H236-11Z,T3K236-11Z,
TV10H236-20Z,T3K236-20Z,TV10H236-02Z,T3K236-02Z,
Z4K236-11Z,ZK4236-11Z,T4K236-11Z,TK4236-11Z,T4K236-20Z,
TK4236-20Z, T4K236-02Z,TK4236-02Z
Z/T256系列限位开关
ZS256-11Z,ZR256-11Z,TS256-11Z,TR256-11Z,TS256-20Z,TR256-20Z,
TS256-02Z,TR256-02Z,
Z4S256-11Z,Z4R256-11Z,ZK256-11Z,T4S256-11Z,T4R256-11Z,TK256-11Z,
T4S256-20Z,T4R256-20Z,TK256-20Z,T4S256-02Z,T4R256-02Z,TK256-02Z,
Z3K256-11Z,Z4K256-11Z,T3K256-11Z,T4K256-11Z,T3K256-20Z,
T4K256-20Z,T3K256-02Z,T4K256-02Z,ZK4256-11Z,ZV1H256-11Z,ZV7H256-11Z, TK4256-11Z,TV1H256-11Z,TV7H256-11Z,
TK4256-20Z,TV1H256-20Z,TV7H256-20Z
TK4256-02Z,TV1H256-02Z,TV7H256-02Z,ZV10H256-11Z, TV10H256-11Z, TV10H256-20Z,
TV10H256-02Z,
Z/T335系列限位开关 、行程开关
ZS335-11Z,ZR335-11Z,
ZS335-02Z,ZR335-02Z,
TS335-11Z,TR335-11Z,
TS335-11ZU,TR335-11ZU,
TS335-20Z,TR335-20Z,
TS335-11Zh,TR335-11Zh,
TS335-02Z,TR335-02Z,TS335-02Zh,TR335-02Zh,
Z4VH335-11Z,
Z4V7H335-11Z,
Z4V10H335-11Z,
Z4VH335-02Z,
Z4V7H335-02Z,
Z4V10H335-02Z,
T4VH335-11Z,
T4V7H335-11Z,
T4V10H335-11Z,
T4VH335-11ZU,T4V7H335-11ZU,
T4V10H335-11ZU,T4VH335-20Z,T4V7H335-20Z,T4V10H335-20Z,
T4VH335-20Zh,T4V7H335-20Zh,T4V10H335-20Zh,T4VH335-02Z,
T4V7H335-02Z,T4V10H335-02Z,T4VH335-02Zh,T4V7H335-02Zh,
T4V10H335-02Zh,TVH335-01/01Z,Z1K335-11Z,Z3K-335-11Z,Z1K335-02Z,
Z3K-335-02Z,T1K335-11Z,T3K-335-11Z,T1K335-11ZU,T3K-335-11ZU,
T1K335-20Z,T3K-335-20Z,T1K335-20Zh,T3K-335-20Zh,T1K335-02Z,
T3K-335-02Z,T1K335-02Zh,T3K-335-02Zh
Z/T336系列限位开关
ZS336-11Z,ZR336-11Z, ZS336-02Z,ZR336-02Z, TS336-11Z,TR336-11Z,
TS336-11ZU,TR336-11ZU,
TS336-20Z,TR336-20Z,TS336-11Zh,TR336-11Zh,TS336-02Z,TR336-02Z,
TS336-02Zh,TR336-02Zh,Z4VH336-11Z,Z4V7H336-11Z,Z4V10H336-11Z,
Z4VH336-02Z,Z4V7H336-02Z,Z4V10H336-02Z,T4VH336-11Z,
T4V7H336-11Z,T4V10H336-11Z,T4VH336-11ZU,T4V7H336-11ZU,
T4V10H336-11ZU,T4VH336-20Z,T4V7H336-20Z,T4V10H336-20Z,
T4VH336-20Zh,T4V7H336-20Zh,T4V10H336-20Zh,T4VH336-02Z,
T4V7H336-02Z,T4V10H336-02Z,T4VH336-02Zh,T4V7H336-02Zh,
T4V10H336-02Zh,TVH336-01/01Z,Z1K336-11Z,Z3K-336-11Z,Z1K336-02Z,
Z3K-336-02Z,T1K336-11Z,T3K-336-11Z,T1K336-11ZU,T3K-336-11ZU,
T1K336-20Z,T3K-336-20Z,T1K336-20Zh,
T3K-336-20Zh,T1K336-02Z,T3K-336-02Z,T1K336-02Zh,
T3K-336-02Zh
ZS332系列限位开关
ZS332-11y,ZR332-11y,Z4VH332-11y,Z4V10H332-11y,Z4V7H332-11y
SMS3-100-100, SMS3-100-150,
标准限位开关（Z/T235、Z/T 236 、Z/T 256 、Z/T 335 、Z/T 336 、
Z332、Z/T 355
系列）
Z/T235系列限位开关
AZ235-11Z,ZR235-11Z,TS235-11Z,TR235-11Z,TS235-20Z,TR235-20Z,
TS235-02Z,TR235-02Z, Z4S235-11Z,Z4R235-11Z,ZK235-11Z,T4S235-11Z,
T4R235-11Z,TK235-11Z,T4S235-20Z,T4R235-20Z,TK235-20Z,T4S235-02Z,
T4R235-02Z,TK235-02Z,ZV12H235-11Z,ZV14H235-11Z, TV12H235-11Z,
TV14H235-11Z,TV12H235-20Z,TV14H235-20Z,TV12H235-02Z,
TV14H235-02Z,ZV10H235-11Z,Z3K235-11Z, TV10H235-11Z,
T3K235-11Z, TV10H235-20Z,T3K235-20Z,
TV10H235-02Z,T3K235-02Z,Z4K235-11Z,ZK4235-11Z,T4K235-11Z,
TK4235-11Z,T4K235-20Z,TK4235-20Z, T4K235-02Z,TK4235-02Z
Z/T236系列限位开关
ZS236-11Z,ZR236-11Z,TS236-11Z,TR236-11Z,TS236-20Z,TR236-20Z,
TS236-02Z,TR236-02Z,
Z4R236-11Z,ZK236-11Z,T4R236-11Z,TK236-11Z,T4R236-20Z,TK236-20Z,
T4R236-02Z,ZK236-02Z,ZV1H236-11Z,Z1R236-11Z, TV1H236-11Z,T1R236-11Z, TV1H236-20Z,T1R236-20Z, TV1H236-02Z,T1R236-02Z, ZV10H236-11Z,
Z3K236-11Z, TV10H236-11Z,T3K236-11Z, TV10H236-20Z,T3K236-20Z,
TV10H236-02Z,T3K236-02Z,Z4K236-11Z,ZK4236-11Z,T4K236-11Z,
TK4236-11Z,T4K236-20Z,TK4236-20Z, T4K236-02Z,TK4236-02Z
Z/T256系列限位开关
ZS256-11Z,ZR256-11Z,TS256-11Z,TR256-11Z,TS256-20Z,TR256-20Z,
TS256-02Z,TR256-02Z,
Z4S256-11Z,Z4R256-11Z,ZK256-11Z,T4S256-11Z,T4R256-11Z,TK256-11Z,
T4S256-20Z,T4R256-20Z,TK256-20Z,T4S256-02Z,T4R256-02Z,TK256-02Z,
Z3K256-11Z,Z4K256-11Z,T3K256-11Z,T4K256-11Z,T3K256-20Z,
T4K256-20Z,T3K256-02Z,T4K256-02Z,ZK4256-11Z,ZV1H256-11Z,ZV7H256-11Z, TK4256-11Z,TV1H256-11Z,TV7H256-11Z, TK4256-20Z,TV1H256-20Z,TV7H256-20Z