Eaton NRX Instruction Manual

Also see for NRX: Installation instructions

15Section 3: General operation and circuit breaker descriptionSeries NRX with PXR - type RF low voltage power (air) circuit breakers instruction manual MN013002ENH03 September 2016 www.eaton.comOperating mechanismThe series NRX operating mechanism is a two-stage storedenergy trip-free mechanism. Energy is stored for a closingoperation with sufficient energy remaining to open the cir-cuit breaker after a closing operation.All circuit breakers should be operated manually and/or elec-trically before they are put into service. This can be doneduring the installation process or some later date prior tostartup. To perform this operational check, follow the proce-dures outlined in this section.Manual operationOn manually operated circuit breakers, the closing springmust be charged by hand. To manually charge the springand operate the circuit breaker, proceed with the followingthree steps:Step 1: Insert one finger in the curved recess behind thecharging handle and pull out and down.Figure 24. Step 1.Step 2: It takes approximately seven full downward strokesto complete the charging process. It is possible to manuallyrecharge the spring immediately after closing the breaker,before it has been tripped open. The status of the spring(charged or discharged) is indicated in the mechanism springstatus window just above the pushbuttons.Figure 25. Step 2.Step 3: Standard manually operated circuit breakers areclosed and opened by hand using the Manual ON andManual OFF buttons located on the front of the circuitbreaker. To perform either operation, press and release theappropriate button. Pressing the close button will not closethe breaker unless the Ready-to-Close flag displays ready.The Ready-to-Close flag is adjacent to the spring status flag.The Ready-to-Close flag will display not-ready if the breakeris closed, not fully charged, or held in the tripped state byan accessory or interlock. The status of the contacts (openor close) is indicated in the Contact Status Window justabove the pushbuttons on the front of the breaker.Figure 26. Step 2.