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Cutler-Hammer Digitrip OPTIM 550 - User Manual

Cutler-Hammer Digitrip OPTIM 550
66 pages
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I.B. 29C891B
Effective 11/98 Supersedes I.B. 29C891A dated October 1996
Cutler-Hammer
Instructions for Operation and Maintenance
of Digitrip OPTIM Trip Units
PROTECTION AND COORDINATION
COMMUNICATIONS SYSTEMS
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DSII/DSLII Power Circuit Breakers
SPB Systems Pow-R Circuit Breakers
Series C K, L, N and R Molded Case Circuit Breakers

Table of Contents

Other manuals for Cutler-Hammer Digitrip OPTIM 550

Preview: Installation Instructions
Installation Instructions12 pages

Questions and Answers

  • J
    Jason EdwardsAug 16, 2025
    What to do if Cutler-Hammer Digitrip OPTIM 550 Circuit breakers trips on ground fault?
    • A
      Adam NavarroAug 16, 2025
      If the Cutler-Hammer circuit breaker trips on a ground fault, it could be due to an actual ground fault. In this case, locate and remove the fault. Alternatively, on four-wire systems, the neutral current sensor might have an incorrect ratio or be improperly connected. Ensure the neutral sensor and its connections are good, the sensor ratio matches the breaker, and the connections from the sensor to the breaker have correct polarity. In some cases, the trip unit itself may be faulty and need replacement.
  • M
    maddoxlouisAug 19, 2025
    How to troubleshoot communication issues over IMPACC with Cutler-Hammer Digitrip OPTIM 550 Circuit breakers?
    • J
      Jeffrey FosterAug 19, 2025
      If the Cutler-Hammer circuit breaker isn't working with IMPACC, first, ensure auxiliary power is supplied by checking if the Unit Status LED is blinking. If it's not, refer to the first symptom in the troubleshooting table. Next, check the INCOM connections on the side terminal block; the transmit LED should flash during communication. If these steps don't resolve the issue, the trip unit may need to be replaced.
  • S
    Sue GilmoreAug 22, 2025
    Why Cutler-Hammer Digitrip OPTIM 550 trips too rapidly on ground fault?
    • L
      Logan ClarkAug 22, 2025
      If the Cutler-Hammer circuit breaker trips too rapidly on a ground fault or short delay when zone selective interlocking is not in use, it might be due to unconnected GOUT to GIN and/or SOUT to SIN connections; add these connections. Incorrect trip unit settings could also be the cause; adjust the settings accordingly. In some cases, the trip unit itself might be faulty and require replacement.
  • A
    Andrew WilliamsAug 26, 2025
    How to fix Cutler-Hammer Digitrip OPTIM 550 Circuit breakers when the Unit Status LED is not blinking?
    • J
      Jacqueline DavisAug 26, 2025
      If the Unit Status LED on your Cutler-Hammer circuit breaker isn't blinking at a one-second on-off cycle, it could be due to several reasons. First, check that auxiliary power is present and correctly polarized by measuring the voltage at the +30VDC and NEG terminals on the side terminal block to ensure it reads 30 ± 3 volts, and verify the polarity. Second, inspect the orange and black wires on the side terminal block for any open connections. If these checks pass, the trip unit itself may be the problem, and the breaker might need replacement.
  • N
    Nathan MartinezAug 28, 2025
    What causes Cutler-Hammer Circuit breakers to trip too rapidly on long delay?
    • C
      Christy GarnerAug 28, 2025
      If the Cutler-Hammer circuit breaker trips too rapidly on long delay, it could be caused by powered thermal memory; if not required, turn it off using the OPTIMizer. Another possibility is incorrect trip unit settings, which should be adjusted. In some cases, the trip unit itself may be the problem.
  • A
    Ann GarciaAug 31, 2025
    What to do if Cutler-Hammer Digitrip OPTIM 550 trips when auxiliary power is applied?
    • R
      Randall BaldwinAug 31, 2025
      If the Cutler-Hammer circuit breaker's instantaneous trip LED comes on as soon as auxiliary power is applied, and the breaker trips if initially closed, the rating plug may not be installed correctly or its pins might not be making a good connection; ensure it is properly installed and check the connections. The rating plug could also be internally open, requiring replacement. In some cases, the trip unit itself may be faulty and need replacement.
  • D
    Daniel FitzgeraldSep 3, 2025
    Why Cutler-Hammer Digitrip OPTIM 550 ground fault alarm unit does not operate on a ground fault?
    • L
      Lisa GarciaSep 3, 2025
      If the ground fault alarm unit for the Cutler-Hammer circuit breaker doesn't operate on a ground fault, check the connections to the ground fault alarm unit to ensure they are correct. Also, test the ground fault alarm by pressing the test button; it should illuminate. If it doesn't, verify that 120V is supplied to the unit; if it is, replace the ground fault alarm unit. Finally, check if the breaker provides an alarm signal by temporarily disconnecting the wires to L1 and L2 on the ground fault alarm unit; approximately 5 volts should appear between GF, AL, and COM when the ground fault current exceeds pickup.
  • T
    Tiffany MooreSep 6, 2025
    What to do if LED does not come on when battery check button is pressed on Cutler-Hammer Circuit breakers?
    • R
      Ronald LucasSep 6, 2025
      If the LED on your Cutler-Hammer circuit breaker doesn't light up when the battery check button is pressed, first, ensure the battery is installed correctly. If it is, the battery may be dead and need replacement. If the issue persists, the trip unit itself may be the problem and require replacement.
  • J
    Jeffrey ClineSep 9, 2025
    What causes 'Connection Failure' when OPTIMizer is plugged into Cutler-Hammer Digitrip OPTIM 550 Circuit breakers?
    • A
      Amy OlsonSep 9, 2025
      If “Connection Failure” is displayed when the OPTIMizer is plugged into the Cutler-Hammer circuit breaker, verify the OPTIMizer is working correctly by testing it on another breaker. Also, ensure the cord is properly plugged into the OPTIMizer. Check the cord connection to the breaker; if the unit status LED is blinking, the connection is likely okay. Additionally, the rating plug might not be installed or could be loose; the instantaneous LED will be on in this case, so install the rating plug and check for loose connections. If the rating plug is internally open, the instantaneous LED will also be on, and the rating plug should be replaced. If none of these steps resolve the issue, the trip unit itself may be the problem.
  • A
    Anthony ReedSep 12, 2025
    Why are power values grossly in error on Cutler-Hammer Digitrip OPTIM 550 Circuit breakers?
    • M
      Matthew FisherSep 12, 2025
      If the power values are grossly in error (1050 Trip Units only) for the Cutler-Hammer circuit breaker, first check the connections from the PT Module to the breaker to ensure they are correctly made. Also, verify the operating frequency with the OPTIMizer to confirm the line frequency is correct. If the issue persists, the trip unit itself may be the problem.

Cutler-Hammer Digitrip OPTIM 550 Specifications

General IconGeneral
BrandCutler-Hammer
ModelDigitrip OPTIM 550
CategoryCircuit breakers
LanguageEnglish