TERASAKI AME6B - 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

V
Veronica OwensAug 7, 2025
Why is my TERASAKI Circuit Breaker molded case overheating?
- B
  Barbara GriffinAug 8, 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.
B
bonnietaylorAug 12, 2025
Why does my TERASAKI Circuit Breaker trip immediately after closing?
- J
  John MezaAug 12, 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.
C
Christopher WolfeAug 17, 2025
What to do if TERASAKI Circuit Breaker tripping operation is impossible?
- D
  davidrobbinsAug 18, 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.
M
Michael TaylorAug 22, 2025
Why is closing operation impossible on my TERASAKI Circuit breakers?
- R
  Rhonda BrownAug 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).
K
kristie40Aug 27, 2025
How to fix no continuity in TERASAKI AME6B Circuit breakers?
- A
  Anthony WagnerAug 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.
E
Erik GarzaSep 1, 2025
What causes an impossible opening operation in TERASAKI AME6B Circuit breakers?
- K
  Kelly LawrenceSep 1, 2025
  If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

INTRODUCTION

Safety Notices

General safety precautions and hazard level definitions for warnings and cautions.

Operation Precautions

Key safety measures to follow during the operation of the ACB.

Installation Precautions

3. INSTALLATION

3.1 Installing Rear-Connected ACB

3.2 Installing Plug-in ACB

4. OPERATION

4.1 Direct-Manual Operation

Instructions for operating the ACB using the direct manual handle.

4.2 External-Manual Operation

4.3 Motorized Operation

5. OVERCURRENT TRIP DEVICE

5.1 Setting Change

Instructions and cautions for changing OCR settings by qualified personnel.

5.2 OCR Field Tests

Procedures for conducting OCR field tests.

6. PRECAUTIONS ON TEMPERATURE-RISE TEST

7. PRECAUTIONS ON INSULATION RESISTANCE TEST AND DIELECTRIC WITHSTAND VOLTAGE TEST

7.1 Insulation Resistance Measurement

7.2 Dielectric Withstand Voltage Test

8. MAINTENANCE AND INSPECTION

8.1 Guideline of Inspection Interval

8.2 Inspection Procedures

Detailed steps and criteria for performing ACB inspections.

9. TROUBLESHOOTING

TERASAKI AME6B Specifications

General

Brand	TERASAKI
Model	AME6B
Category	Circuit breakers
Language	English

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