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Home›Repair guides›Under Voltage Release (UVR) Installation and Mechanical Verification

Circuit Breaker Info - Eaton Cutler Hammer — Under Voltage Release (UVR) Installation and Mechanical Verification

A Circuit Breaker Info - Eaton Cutler Hammer service procedure — check it applies to your exact model before use.

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Before you start

  • IF UVR IS REMOVED FROM CIRCUIT BREAKER, INTERMEDIATE PLUNGER MUST ALSO BE REMOVED. FAILURE TO REMOVE THE INTERMEDIATE PLUNGER CAN RESULT IN EQUIPMENT DAMAGE.
  • LEADS SHOULD BE FORMED AND ROUTED TO CLEAR ALL MOVING PARTS WHEN ACCESSORY IS PROPERLY INSTALLED. PIGTAIL WIRES COULD BE DAMAGED IF IN CONTACT WITH MOVING PARTS.
  • FAILURE TO KEEP FINGERS AWAY FROM MOVING PARTS CAN CAUSE PERSONAL INJURY. WHEN CHECKING ACCESSORY, DO NOT PUT FINGERS NEAR MOVING PARTS INSIDE CIRCUIT BREAKER CASE. SPRINGS CAUSE INTERNAL PARTS TO MOVE QUICKLY AND WITH FORCE.
  • WHEN INSTALLING CIRCUIT BREAKER MAIN COVER, MAKE SURE THAT ALL INTERNAL PARTS ARE IN PLACE: SLIDING HANDLE BARRIER IS POSITIONED SO THAT THE HANDLE OPENING IS ALIGNED WITH THE HANDLE. ALL LEADS ARE CLEAR OF THE COVER.

Procedure

  1. Remove barrier from trip unit accessory mounting slots in pole being used for accessory (Fig. 2-2).
  2. Install replacement interphase barrier (Supplied with kit) in base (See Fig. 2-3).
  3. Position intermediate plunger in trip unit (Fig. 2-2).
  4. Press intermediate plunger into recess in trip unit and hold in position.
  5. Push circuit breaker handle towards the ON position and hold while sliding UVR plug-in module into slots in trip unit (Fig. 2-4) until retaining clip snaps into trip unit. For terminal block assemblies, slide terminal block into mounting slot on side of base as plug-in module is being positioned.
  6. For UVR having rear or opposite-side exiting pigtail leads, thread leads through center trough in side of base before attempting to insert the mounting bracket. Pigtail leads exiting in this manner should be eased through trough as mounting bracket is inserted into trip unit retaining slots. Use center trough also for leads exiting the side of the circuit breaker.
  7. Route wiring to meet installation requirements (Fig. 2-5). If required, complete routing of leads of opposite side through rear wiring trough.
  8. Perform mechanical check of UVR after installation: With the circuit breaker still electrically isolated, reset the circuit breaker.
  9. Using a small flat-blade screwdriver (Fig. 2-6), push in and hold solenoid plunger. Switch circuit breaker to ON. Release solenoid plunger and check that circuit breaker trips.
  10. Reset circuit breaker handle and check that handle arm moves reset lever to reset the solenoid plunger.
  11. If mechanical check does not trip circuit breaker, see if UVR and intermediate plunger are correctly installed. If UVR and intermediate plunger appear to be properly installed and problem persists, contact Cutler-Hammer.
  12. With circuit breaker handle in the TRIPPED position and accessory pigtail leads (if used) routed as required, install circuit breaker covers. Secure with pan-head screws. Torque to 20-22 lb-in (2.26-2.49 N.m).
  13. Remove and discard UL listing label on LDB circuit breakers only.
  14. Place accessory labels (supplied with kit) on circuit breaker (see Fig. 2-7).
  15. Where practical and after taking all necessary safety precautions, apply rated voltage to UVR. Reset and close circuit breaker. Confirm that circuit breaker trips when voltage is removed.
  16. Install circuit breaker.

Tools required

  • Small flat-blade screwdriver
  • Pan-head screws

Specs & torque values

  • Replacement interphase barrier
  • UVR plug-in module
  • Intermediate plunger
  • Terminal block assemblies
  • Torque specification: 20-22 lb-in (2.26-2.49 N.m) for cover screws

Source: manual:Eaton C Frame Under Voltage Release.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.