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TERASAKI AME Series - 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

  • L
    lbryanAug 2, 2025
    Why is my TERASAKI Circuit Breaker molded case overheating?
    • J
      johnodomAug 2, 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.
  • R
    rebeccamartinezAug 7, 2025
    Why does my TERASAKI Circuit Breaker trip immediately after closing?
    • S
      Sarah GarrettAug 7, 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.
  • E
    edwardfullerAug 12, 2025
    What to do if TERASAKI Circuit Breaker tripping operation is impossible?
    • A
      Anthony BeckerAug 12, 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.
  • B
    Brian Mooney DVMAug 17, 2025
    Why is closing operation impossible on my TERASAKI AME Circuit breakers?
    • T
      travis10Aug 17, 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).
  • B
    Brian DrakeAug 22, 2025
    How to fix no continuity in TERASAKI AME?
    • B
      Benjamin CoxAug 22, 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.
  • M
    Mrs. Melissa DanielAug 27, 2025
    What causes an impossible opening operation in TERASAKI AME?
    • J
      Joseph BradleyAug 27, 2025
      If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

Receiving and Handling

Unpacking Precautions

Checks to perform upon receipt and precautions during unpacking.

Transportation Precautions

Guidelines for safely moving the ACB during transport.

Storage Precautions

Recommendations for storing the ACB before installation.

Installation

Installing Rear-Connected ACB

Detailed steps and precautions for mounting rear-connected ACBs.

Installing Plug-in ACB

Instructions for installing plug-in type ACBs and mounting bases.

Connection and Specifications of Accessories

Wiring and rating details for optional accessories like UVT, SHT, etc.

Operation

Direct-Manual Operation

How to operate the ACB using its direct manual handle.

External-Manual Operation

Operation procedures using an external manual operating handle.

Motorized Operation

How to operate the ACB using a motorized operator.

Manual Operation of Motor Operator

Procedures for manual operation of the motor operator.

Overcurrent Trip Device

Setting Change

How to adjust the settings for the overcurrent trip device.

OCR Field Tests

Procedures for testing the overcurrent trip device characteristics.

Precautions on Tests

Temperature-Rise Test Precautions

Safety guidelines for performing temperature-rise tests.

Insulation Resistance and Dielectric Withstand Voltage Test Precautions

Safety and procedural notes for electrical tests.

Maintenance and Inspection

Guideline of Inspection Interval

Recommended intervals for inspecting the ACB based on conditions.

Inspection Procedures

Step-by-step guide for inspecting the ACB's components.

Troubleshooting

TERASAKI AME Series Specifications

General IconGeneral
BrandTERASAKI
ModelAME Series
CategoryCircuit breakers
LanguageEnglish

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