1.觸頭接觸壓力  無勵磁分接開關動觸頭與定觸頭之間的接觸壓力增大，則接觸電阻減小.但壓力過分增大，不會使接觸電阻繼續降低，而使轉動力矩相應增加。一般要求接觸壓力為25?50N， 用專用的測壓計或彈簧秤來測量。測量的觸頭最小接觸壓力為在觸頭串聯的信號燈熄火時 或動定觸頭間放置的厚度小于0.1mm的塞片能自由活動時的分離力。 

        2.觸(chu)(chu)頭接(jie)(jie)觸(chu)(chu)電(dian)(dian)(dian)阻  觸(chu)(chu)頭的接(jie)(jie)觸(chu)(chu)方式理(li)論上(shang)分為點接(jie)(jie)觸(chu)(chu)、線接(jie)(jie)觸(chu)(chu)和面(mian)接(jie)(jie)觸(chu)(chu)三種(zhong)，實(shi)際(ji)上(shang)，在動定(ding)觸(chu)(chu)頭間僅 有(you)幾點接(jie)(jie)觸(chu)(chu)。接(jie)(jie)觸(chu)(chu)電(dian)(dian)(dian)阻與接(jie)(jie)觸(chu)(chu)壓(ya)力(li)、觸(chu)(chu)頭材(cai)料.觸(chu)(chu)頭表面(mian)平整度(du)以及(ji)技觸(chu)(chu)面(mian)積(ji)有(you)關，一般 應(ying)保證(zheng)小(xiao)于5OOμΩ,用電(dian)(dian)(dian)橋法(fa)(fa)或電(dian)(dian)(dian)壓(ya)降(jiang)法(fa)(fa)來(lai)測(ce)量，若用電(dian)(dian)(dian)壓(ya)降(jiang)法(fa)(fa)測(ce)量時電(dian)(dian)(dian)流應(ying)小(xiao)于額定(ding)通過 電(dian)(dian)(dian)流的1/3。測(ce)童前應(ying)對分接(jie)(jie)開(kai)關進行1~3個操作循(xun)環(huan)。 

        3.轉(zhuan)(zhuan)動力(li)矩  無勵磁分接(jie)開關(guan)的轉(zhuan)(zhuan)動力(li)矩規(gui)定見(jian)表(biao)1-2。  轉(zhuan)(zhuan)動力(li)矩是(shi)用扭轉(zhuan)(zhuan)計法(fa)或(huo)(huo)間(jian)接(jie)法(fa)從分接(jie)開關(guan)轉(zhuan)(zhuan)軸上或(huo)(huo)操動機(ji)構的手柄(bing)處測(ce)量的，用間(jian) 接(jie)法(fa)時把彈簧(huang)鉤住手柄(bing)，將(jiang)彈簧(huang)秤測(ce)出的力(li)P乘以臂(bei)長L面求(qiu)得。

        4.絕(jue)緣耐壓(ya)(ya)  無勵(li)磁分接(jie)開(kai)關的(de)(de)全(quan)波對(dui)地(di)電(dian)(dian)(dian)(dian)壓(ya)(ya)和中(zhong)部(bu)或端部(bu)調壓(ya)(ya)的(de)(de)相間電(dian)(dian)(dian)(dian)壓(ya)(ya)等于變壓(ya)(ya)器(qi)的(de)(de)雷電(dian)(dian)(dian)(dian)沖擊 全(quan)波試(shi)驗(yan)電(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)100%，觸頭(tou)間電(dian)(dian)(dian)(dian)壓(ya)(ya)梯度約為(wei)調壓(ya)(ya)百(bai)分數的(de)(de)3倍（指調壓(ya)(ya)范(fan)圍內(nei)梯度）.工 頻對(dui)地(di)電(dian)(dian)(dian)(dian)壓(ya)(ya)和相間電(dian)(dian)(dian)(dian)S均為(wei)變壓(ya)(ya)器(qi)的(de)(de)工頻耐壓(ya)(ya)值。  無勵(li)磁分接(jie)開(kai)關在(zai)進(jin)行(xing)絕(jue)緣耐壓(ya)(ya)試(shi)驗(yan)以(yi)前，須將開(kai)關干燥，然后浸在(zai)耐壓(ya)(ya)為(wei)MkV以(yi)h 的(de)(de)變壓(ya)(ya)器(qi)油(you)中(zhong)，使氣泡(pao)全(quan)部(bu)逸(yi)出(chu)(chu)，浸漬時間要求不小(xiao)于05h。分接(jie)開(kai)關采用塑料壓(ya)(ya)制件時， 必須在(zai)85~100℃的(de)(de)變壓(ya)(ya)器(qi)油(you)中(zhong)進(jin)行(xing)試(shi)驗(yan)；其它(ta)分接(jie)開(kai)關的(de)(de)出(chu)(chu)廠試(shi)驗(yan)可在(zai)空氣中(zhong)進(jin)行(xing)，但耐壓(ya)(ya)值減小(xiao)2.5倍，持續時間為(wei)5min。