TERASAKI AME10B - 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

C
Charles GilesAug 7, 2025
Why is my TERASAKI Circuit Breaker molded case overheating?
- A
  Alex BakerAug 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.
F
flemingnormaAug 12, 2025
Why does my TERASAKI Circuit Breaker trip immediately after closing?
- J
  John McleanAug 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.
J
Justin ValenciaAug 17, 2025
What to do if TERASAKI Circuit Breaker tripping operation is impossible?
- C
  Christopher EstradaAug 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.
B
Brian HamiltonAug 22, 2025
Why is closing operation impossible on my TERASAKI AME10B?
- G
  gailfreemanAug 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).
W
weaverchristianAug 27, 2025
How to fix no continuity in TERASAKI AME10B Circuit breakers?
- B
  Bruce AdamsAug 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.
D
Donna GlennSep 1, 2025
What causes an impossible opening operation in TERASAKI AME10B Circuit breakers?
- S
  Samantha GonzalezSep 1, 2025
  If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

Introduction and Safety

Safety Notices

Details safety notices divided into 'Warning' and 'Caution' based on hazard level.

Operation Precautions

ACB Overview, Handling, and Installation

Installation

Detailed instructions for installing the Air Circuit Breaker.

Installing Rear-Connected ACB

Steps and precautions for installing the rear-connected ACB, including torque specifications.

Installing Plug-in ACB

Accessories and Operation

Direct-Manual Operation

External-Manual Operation

Motorized Operation

Overcurrent Protection and Testing

Overcurrent Trip Device (OCR)

Details the Overcurrent Trip Device (OCR), its components, and protective functions.

Setting Change

OCR Field Tests

Procedures and precautions for conducting field tests on the OCR.

Tests with Current Applied to the Main Circuit

Tests the long time-delay characteristics by applying large current to the main circuit.

Tests with Current Applied to the OCR Test Terminal

Tests tripping characteristics by applying secondary current to OCR test terminals.

Tests Using OCR Checker (type ANS1)

Checks the instantaneous trip function using the ANS1 OCR checker.

Maintenance and Troubleshooting

Maintenance and Inspection

Inspection Procedures

Troubleshooting

Lists common symptoms, possible causes, and recommended actions for ACB troubleshooting.

TERASAKI AME10B Specifications

General

Rated Current (In)	10A
Breaking capacity	10kA
Rated voltage	240V AC
Mounting type	DIN rail
Poles	1P
Number of poles	1
Trip characteristic	Type B

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