Compounds of the formula, wherein L1, L2, L3 and L4 independently of one another are hydrogen or an organic substituent; R is for example C1-C20alkyl, C5-C12cycloalkyl, C2-C20alkenyl, substituted C1-C20alkyl; X is O, S, NRa or NCORa; Ra is for example hydrogen or C1-C20alkyl; and Y is an inorganic or organic anion; are suitable as photolatent acid generators. With an insert portion 13 of a side view endoscope 10 inserted in an insert tube 41 of the balloon catheter 40, the balloon catheter 40 is inserted into a blood vessel B. The breaker reset system is self-contained and dimensioned as an add-on component to previously installed circuit breaker enclosure or as an integrated component of a circuit breaker enclosure. The radius guides each have a leading edge and a trailing edge for supporting the cable and a curved central portion therebetween around which the cable is bent.