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TERASAKI AME3B - User Manual

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KRB-5200h
Air Circuit Breakers
AME Series
Instruction Manual
Applicable Breaker Types:
AME3B
AME4B
AME6B
AME8B
AME10B
Please retain this manual for future reference.

Table of Contents

Questions and Answers

  • S
    Steven JonesAug 7, 2025
    Why is my TERASAKI Circuit Breaker molded case overheating?
    • V
      vestesAug 7, 2025
      Your TERASAKI Circuit Breaker's molded case may be overheating because the main contact surface is roughening. Try polishing the contact surface with emery paper. However, if the contact surface is excessively roughened and the internal resistance exceeds its limit, replace the ACB. Another cause could be loose terminal screws or stud fixing screws. Retighten the screws to the standard torque. Ensure all screws are securely tightened.
  • J
    jonesconnorAug 12, 2025
    Why does my TERASAKI Circuit Breaker trip immediately after closing?
    • C
      christinanortonAug 13, 2025
      If your TERASAKI Circuit Breaker trips open right after you close it, review the starting method of the load or change the short time-delay trip pick-up current (I) setting. Also, check the electrical distribution system and the wire connections.
  • R
    Robert CarpenterAug 17, 2025
    What to do if TERASAKI Circuit Breaker tripping operation is impossible?
    • J
      Jenna PerezAug 17, 2025
      If the tripping operation of your TERASAKI Circuit Breaker is impossible, the OCR or UVT may be defective and need replacement (consult Terasaki for advice). Check for looseness of wire connections and switch contacts. The SHT may also need replacement. Ensure that the applied voltage is of rated voltage x 70% or more. Lubricate the mechanism to reduce friction.
  • Y
    yolandacastroAug 22, 2025
    Why is closing operation impossible on my TERASAKI AME3B?
    • R
      Ryan VaughanAug 22, 2025
      If closing operation is impossible on your TERASAKI Circuit breaker, it could be due to several reasons. The voltage applied to the UVT may be insufficient; ensure it's at least 85% of the rated voltage. The UVT itself might be defective, in which case it should be replaced (consult Terasaki for advice). The SHT may also be defective and needs replacement. Try resetting the handle. The tripping mechanism may need repair (consult Terasaki for advice).
  • R
    Robert SmithAug 27, 2025
    How to fix no continuity in TERASAKI Circuit Breakers?
    • D
      Daniel BranchAug 27, 2025
      If there is no continuity in your TERASAKI Circuit Breaker, it could be because the main contact surface is worn and roughened, or the contact lead is disconnected due to excessive operation cycles or corrosive gases. In either of these cases, replace the ACB. Also, clean the auxiliary circuit terminals.
  • A
    Anthony BakerSep 1, 2025
    What causes an impossible opening operation in TERASAKI Circuit Breakers?
    • R
      Robert MarshallSep 1, 2025
      If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

Safety Notices

Operation Precautions

Safety guidelines for operating the ACB.

Installation

Installing Rear-Connected ACB

Procedures for installing rear-connected ACB units.

Installing Plug-in ACB

Steps for installing plug-in type ACB units.

Connection and Specifications of Accessories

Undervoltage Trip Device (UVT)

Connection and rating details for the UVT accessory.

Shunt Trip Device (SHT)

Operation

Direct-Manual Operation

External-Manual Operation

Motorized Operation

Overcurrent Trip Device

Setting Change

OCR Field Tests

Guidelines and procedures for testing OCR functions.

Precautions on Insulation Resistance Test and Dielectric Withstand Voltage Test

Insulation Resistance Measurement

Dielectric Withstand Voltage Test

Maintenance and Inspection

Guideline of Inspection Interval

Inspection Procedures

Detailed steps for performing ACB maintenance and inspection.

Troubleshooting

TERASAKI AME3B Specifications

General IconGeneral
BrandTERASAKI
ModelAME3B
CategoryCircuit breakers
LanguageEnglish

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