This one has the Circuit breaker fits all sizes up to 21 amps
Clearwater Genuine P.C.B.s for C Series chlorinators all brown & white boxes incl. early B, BH, HS, TS, QC, Hydromaster 4000 & 7000. 130/140/170/190/200/270B/C/LS/BH/TS
TIP: only adjust uppermost output[amps] trim pot, do not touch lower 2 trim pots, now with unit running, hold cell leads between thumb and forefinger, touch sensor wire, see output. adjust to 100% only. Use rubber gloves, very small screwdriver, be careful of 240V.
