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The fire rated 4-7/8" cylindrical solution.
The new 3478F streamlines the heavy duty 3000 fire rated series by offering only one faceplate... the most popular 4-7/8" ANSI.
This Model utilizes an external line conditioner (LC100) module to regulate input voltages, 11-28 AC or DC, and conditions the output for the pull-in activation period. Then reduces holding voltage output for continuous operation and reduced heat. The LC100 provides current and voltage surge protection and kickback protection. LC100 must be used - must be installed within 15' of the mechanism.