First, begin with my seminal tome on the topic ==> http://fixitnow.com/wp/2010/08/23/ge-triton-xl-dishwasher-trips-circuit-breaker/

And then on to this enrichment material from Master Reg:

here's some info.

also: Service Bulletin GE TRITON XL DISHWASHERS

GSD6000 SERIES

PDW7000 SERIES

EDW4000 SERIES

Transorb kit

*Shorted Transorb will likely damage the main electronic control board.

click on picture

seems to be a 1.5KE220CA Bi-directional TVS Diode

(about $1)

1500w peak 220v C = bi-directional

Source: GE Dishwasher Mod# GSD3900L00BB