Circuit breakers generally have no difficulty in interrupting shunt reactor currents and in fact may force the current to a premature zero due to the phenomenon of current chopping. Shunt reactor switching is however a unique and onerous duty for circuit breakers involving a complex interaction between the characteristics of the circuit breaker by type, gas or vacuum, and by way of its current chopping capability, arc voltage and arcing time, and the circuit as represented by its effective inductance and capacitances and reactor grounding arrangement. This tutorial explains the interaction in detail and the derivation of a generalized circuit breaker TRV equation which can be used for any shunt reactor application. Five reactor application cases will be considered and attendees should bring a calculator for this part of the course.