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Heads for Emergency Stop, ZB4-B Trigger action Available as either twist to release or key to release All heads require a body/ fixing collar, see stock no. 331-0142 and contact bodies, see stock no. 331-0158 etc 40mm diameter Schneider Electric ZB4-B & XB4-B Harmony® 22mm Range Technical note for Twist to release emergency stop switch ZB4BS844 (RS Article: 3309388) is the direct replacement for ZB4BS54 (RS Article: 4137960) but includes 'trigger action' operation. What is trigger action?
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