Thanks to all who repsonded to my inquiry, we replaced the Moeller starter with a Benshaw RSC 150-U-120 (NEMA rated @ 40hp) and everything seems to be working fine for the past week.
I have a US Motor model N865 30hp three phase motor, 208/230/460 on 208 service. This motor drives a Webtrol pump which cycles about 100 times per hour and provides rinse water at about 600psi. The motor starter is a Moeller DIL4M115 (24V50/60HZ) part number 209758 and is rated at 40hp.
We have...