TERASAKI AME8B - 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

J
Jeanette JonesAug 7, 2025
Why is my TERASAKI Circuit Breaker molded case overheating?
- M
  Michael MathisAug 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.
R
Robert GreerAug 12, 2025
Why does my TERASAKI Circuit Breaker trip immediately after closing?
- A
  Abigail MooreAug 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.
D
derrick73Aug 17, 2025
What to do if TERASAKI Circuit Breaker tripping operation is impossible?
- I
  Isabella JonesAug 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.
S
Samantha ColeAug 22, 2025
Why is closing operation impossible on my TERASAKI AME8B?
- M
  Matthew FaulknerAug 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).
J
Jon CollinsAug 27, 2025
How to fix no continuity in TERASAKI Circuit Breakers?
- R
  richardsluisAug 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.
L
Leslie AndersonSep 1, 2025
What causes an impossible opening operation in TERASAKI AME8B Circuit breakers?
- J
  jessica63Sep 1, 2025
  If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

3. INSTALLATION

Rear-Connected ACB Installation

Detailed instructions and precautions for installing rear-connected Air Circuit Breakers.

3.3 Connection and Specifications of Accessories

Undervoltage Trip Device (UVT) Details

Details connection, ratings, and operation of the optional Undervoltage Trip Device (UVT).

Shunt Trip Device (SHT) Details

Details connection, ratings, and operation of the optional Shunt Trip Device (SHT).

Motor Operator Specifications & Connection

4. OPERATION

Direct Manual Operation Procedures

External Manual Operation Guide

5. OVERCURRENT TRIP DEVICE

OCR Setting Adjustment Procedures

OCR Field Tests

Procedures for performing field tests on the Overcurrent Trip Device (OCR).

8. MAINTENANCE AND INSPECTION

Inspection Interval Guidelines

Detailed ACB Inspection Procedures

Outlines the step-by-step procedures for inspecting the ACB's components.

9. TROUBLESHOOTING

TERASAKI AME8B Specifications

General

Brand	TERASAKI
Model	AME8B
Category	Circuit breakers
Language	English

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