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限位開關(guān)就是用以限定機(jī)械設(shè)備的運(yùn)動(dòng)極限位置的電氣開關(guān)。限位開關(guān)有接觸式的和非接觸式的。接觸式的比較直觀，機(jī)械設(shè)備的運(yùn)動(dòng)部件上，安裝上行程開關(guān)，與其相對(duì)運(yùn)動(dòng)的固定點(diǎn)上安裝極限位置的擋塊，或者是相反安裝位置。當(dāng)行程開關(guān)的機(jī)械觸頭碰上擋塊時(shí)，切斷了（或改變了）控制電路，機(jī)械就停止運(yùn)行或改變運(yùn)行。由于機(jī)械的慣性運(yùn)動(dòng)，這種行程開關(guān)有一定的“超行程”以保護(hù)開關(guān)不受損壞。非接觸式的形式很多，常見的有干簧管、光電式、感應(yīng)式等，這幾種形式在電梯中都能夠見到。當(dāng)然還有更多的先進(jìn)形式。
限位開關(guān)是一種常用的小電流主令電器。利用生產(chǎn)機(jī)械運(yùn)動(dòng)部件的碰撞使其觸頭動(dòng)作來實(shí)現(xiàn)接通或分?jǐn)嗫刂齐娐?，達(dá)到一定的控制目的。通常，這類開關(guān)被用來限制機(jī)械運(yùn)動(dòng)的位置或行程，使運(yùn)動(dòng)機(jī)械按一定位置或行程自動(dòng)停止、反向運(yùn)動(dòng)、變速運(yùn)動(dòng)或自動(dòng)往返運(yùn)動(dòng)等。
在電氣控制系統(tǒng)中，限位開關(guān)的作用是實(shí)現(xiàn)順序控制、定位控制和位置狀態(tài)的檢測(cè)。用于控制機(jī)械設(shè)備的行程及限位保護(hù)。構(gòu)造：由操作頭、觸點(diǎn)系統(tǒng)和外殼組成。
在實(shí)際生產(chǎn)中，將限位開關(guān)安裝在預(yù)先安排的位置，當(dāng)裝于生產(chǎn)機(jī)械運(yùn)動(dòng)部件上的模塊撞擊行程開關(guān)時(shí)，限位開關(guān)的觸點(diǎn)動(dòng)作，實(shí)現(xiàn)電路的切換。因此，行程開關(guān)是一種根據(jù)運(yùn)動(dòng)部件的行程位置而切換電路的電器，它的作用原理與按鈕類似。
限位開關(guān)廣泛用于各類機(jī)床和起重機(jī)械，用以控制其行程、進(jìn)行終端限位保護(hù)。在電梯的控制電路中，還利用行程開關(guān)來控制開關(guān)轎門的速度、自動(dòng)開關(guān)門的限位，轎廂的上、下限位保護(hù)
CUTLER HAMMER E51-CNF11 USPP E51CNF11
CUTLER HAMMER E51CNC1 NSFP E51CNC1
CUTLER HAMMER E51-CLT26PU USPP E51CLT26PU
CUTLER HAMMER E51-CLP3 NSFP E51CLP3
CUTLER HAMMER E51-CLP3 LIMIT SWITCH E51CLP3 PHOTOELECTRIC SENSOR EATON 
Cutler Hammer E51CLP1 
CUTLER HAMMER E51CLP1 PHOTOELECTRIC SENSOR
CUTLER HAMMER E51-CLP1 NSFP E51CLP1
CUTLER HAMMER E51CLF3 PHOTOELECTRIC SENSOR DARK 
CUTLER HAMMER E51CLF3 PHOTOELECTRIC SENSOR DARK 
CUTLER HAMMER E51-CLF3 NSFP E51CLF3
CUTLER HAMMER E51CLF1 NSFP E51CLF1
CUTLER HAMMER E51BLT5 PROXIMITY SWITCH SENSOR LIMIT 
CUTLER HAMMER E51BLT1 PROXIMITY SENSOR INDUCTIVE NO OR NC E51 E51L
CUTLER HAMMER E51-BLP2 USPP E51BLP2
CUTLER HAMMER E51-ALT2 NSPP E51ALT2
Cutler Hammer E51ALT1 
CUTLER HAMMER E51ALS6 NSFP E51ALS6
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Cutler Hammer E51ALP1 
CUTLER HAMMER E51ALP1 PHOTOELECTRIC SENSOR NIB
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CUTLER HAMMER E50TD1 LIMIT SWITCH 
Cutler Hammer E50SN E50DN1 Limit Switch
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Cutler Hammer E50 
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CUTLER HAMMER E50-SAN6P12 NSFP E50SAN6P12
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Cutler Hammer E50SA E50DR1 E50RA Limit Switch
Cutler Hammer E50NN1 Limit Switch
Cutler Hammer E50NN1 Limit Switch
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Cutler Hammer E50GNG1 Limit Switch - No Box
Cutler Hammer E50GNG1 Limit Switch
Cutler Hammer E50DT3 Pack of 6 Limit Switch Operating Head
Cutler Hammer E50DS3 Pack of 6 Limit Switch Operating Head
Cutler Hammer E50DS1 Pack of 6 Limit Switch Head Ser A1 - No Box
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Cutler Hammer E50BT3 Limit Switch With Roller
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Cutler Hammer E50AT5 Limit Switch
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Cutler Hammer E50AT3 Limit Switch Series A2 600V Eaton E50RA20 A1
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CUTLER HAMMER E50AR1 IN A BOX
Cutler Hammer E50ANT3 Limit Switch With Roller
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Cutler Hammer E30JN Pushbutton Operator E30-JN
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