is accomplished by first releasing the secondary latch 32 within the latch assembly 22 by contact between the trip bar 21 within the latch assembly 22 and the trip lever 34 extending from the trip actuator 57 the trip lever is restrained from contacting the trip bar under the urgence of the trip spring 35 by engagement between the trip lever 39 and the latch pin 38 as indicated the trip unit described earlier energizes the trip coil 36 upon the occurrence of an overcurrent condition which releases the trip plunger 37 into contact with the latch plate 40 the latch lever 39 correspondingly rotates to release the latch pin 38 and thereby allow the trip lever 34 to contact the trip bar 21 and release the latch assembly 22 the operating mechanism 20 and latch assembly 22 are depicted in fig4 in order to detail the selective components that are coated with zinc phosphate and tin phosphate to deter oxidation while providing lubricity between the coated parts the tin phosphate coating being applied over the zinc phosphate by the methods described within u s pat nos 4 673 445 and 4 749 417 the operating mechanism 20 is supported.