text: <s>[INST] 140MT application clarification 140MT Motor Protection Circuit Breakers I haven't used breakers with OL protection built in. I usually configure my branch circuits to motors with a breaker, contactor, then the OL, and finally the motor. Are you allowed to, in the USA, make a branch circuit with the 140MT, the contactor, and then the motor? Where can I verify this rule. I never saw such an exception in the NEC, or maybe I did not read it correctly. Or maybe there is an exception from another publication from the NFPA. I see a publication that says the 140UT are UL 489. I didn't see this for 140MT yet. [/INST] Larson, The documentation 140-td005 shows the 140MT in a group motor installation with a Branch Circuit Protective Device (BCPD) for the Group. Bulletin 140MT devices are UL Listed for Tap Conductor protection in group installations, which helps reduce conductor sizing. Conductors from the BCPD to manual motor controller listed as …Tap Conductor Protection… must be minimum of 1/10 the rating or setting of the BCPD. Conductors from the controller to the motor must be 125% of the motor FLA. The document does not show the 140MT outside of the group motor installation e.g. a single motor... and I don't see where the 140MT has the UL 489 Molded-Case Circuit Breakers so I think it requires upstream protection. I would suggest starting at ticket with tech support to get a more official response. \\n </s>