Pbm27a-210-mv--r Diagram

A slow-blow fuse and a Metal Oxide Varistor (MOV) sit across the AC line to absorb sudden power surges or lightning strikes.

The resistance increases linearly with temperature: [ R(T) = 210 \times [1 + 4.8\times10^-6(T - 25)] ] Maximum deviation from linearity is 0.02% at 125°C, confirming the TCR spec.

[120V AC Input] ---> [Primary Stage: Fuse/Rectifier/PWM] ---> [High-Freq Transformer] | (Isolation) | [Status LED Display] <-- [Secondary Stage: MCU / Charge Control] <----+ 1. The Primary High-Voltage Stage