TERASAKI AME4B - User Manual

40 pages

Save Page as PDF

To Next Page

To Next Page

Loading...

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
Justin SimsAug 7, 2025
Why is my TERASAKI Circuit Breaker molded case overheating?
- C
  cynthia33Aug 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.
E
Eric ReidAug 12, 2025
Why does my TERASAKI Circuit Breaker trip immediately after closing?
- C
  courtney31Aug 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.
R
romanchristinaAug 17, 2025
What to do if TERASAKI Circuit Breaker tripping operation is impossible?
- M
  Melissa WolfeAug 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.
T
Thomas EscobarAug 22, 2025
Why is closing operation impossible on my TERASAKI AME4B Circuit breakers?
- M
  Mr. Joshua RoyAug 23, 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).
D
Douglas JohnsonAug 27, 2025
How to fix no continuity in TERASAKI AME4B Circuit breakers?
- J
  Julia CampbellAug 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
Daniel HarrisSep 1, 2025
What causes an impossible opening operation in TERASAKI AME4B?
- J
  Jessica NortonSep 2, 2025
  If the opening operation is impossible in your TERASAKI Circuit Breaker, the main contact is likely welded. Replace the ACB.

Summary

INTRODUCTION

Operation Precautions

Details critical precautions for operating the ACB, including warnings about live parts.

3. INSTALLATION

3.1 Installing Rear-Connected ACB

Instructions for installing the rear-connected type of ACB, including torque specifications.

3.2 Installing Plug-in ACB

Procedures for installing the plug-in type ACB, covering connections and torque.

4. OPERATION

4.1 Direct-Manual Operation

Instructions for operating the ACB using the direct manual handle, including handle positions.

5. OVERCURRENT TRIP DEVICE

5.1 Setting Change

Procedures for changing the settings of the Overcurrent Trip Device (OCR).

5.2 OCR Field Tests

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

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

8. MAINTENANCE AND INSPECTION

8.2 Inspection Procedures

9. TROUBLESHOOTING

TERASAKI AME4B Specifications

General

Number of Poles	4
Rated Voltage	415VAC
Trip Characteristic	B
Mounting Type	DIN rail
Poles	4P

Related product manuals

TERASAKI AME10B

TERASAKI AME Series

TERASAKI AR208S

TERASAKI AR212S

TERASAKI AR216S

TERASAKI AR220S

TERASAKI AR325S

TERASAKI AR332S

TERASAKI TemBreak 2