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Siemens 3SB5 Operating Instructions Manual page 7

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Replacement of "Indicator Cap" of Twin Push button with "Indicator lens (3SB5912-0BB)"
Step 1: Press both the pushers (37 & 38) simultaneously to their maximum travel with the fingers & then hold & pull
the indicator cap (39) to remove it from the Twin Push button actuator (35).
Step 2: Press fit the "Indicator Lens", 40 (3SB5912-0BB) in between the Pushers (37 & 38), till the click sound is heard.
Step 3: Press both the Pushers (37 & 38) to their maximum travel to check their proper functioning.
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