Terasaki Marine Circuit Breakers
Terasaki
Refurbished
Terasaki Marine Circuit Breakers | TL Series | XS Series | XH Series | XE Series | EP Series | MCCB | ACB | Spare Parts | SM MARINE SERVICE™
Terasaki Electric Co., Ltd.
Japan
Marine Circuit Breaker, MCCB, ACB, Electrical Protection Device, Switchboard Protection Component
Main Switchboard, Emergency Switchboard, Generator Protection, Motor Protection, Power Distribution, Ship Automation, Engine Room Electrical System
Terasaki circuit breakers are widely used in marine electrical systems for safe power distribution, overload protection, short-circuit protection, generator protection, motor control, and emergency switchboard applications. On commercial vessels, reliable circuit breakers are essential because any failure in the electrical protection system can affect generators, pumps, motors, navigation equipment, automation systems, and emergency power supply.
The Terasaki TemBreak series, TL series, XS series, XH series, XE series, and EP series are commonly found on ships, offshore vessels, tankers, bulk carriers, container vessels, LNG carriers, passenger ships, and shipyard electrical panels.
SM MARINE SERVICE™ supplies new, used, and professionally reconditioned Terasaki marine circuit breakers, accessories, protection relays, trip units, coils, spare parts, and complete replacement units for worldwide customers.
A Terasaki marine circuit breaker is an electrical protection device designed to automatically disconnect power when abnormal conditions occur. These conditions may include overload, short circuit, earth fault, undervoltage, generator fault, or motor protection failure.
In marine applications, circuit breakers are installed in:
Main Switchboards
Emergency Switchboards
Generator Panels
Motor Control Centers
Distribution Boards
Pump Starter Panels
Cargo Control Panels
Power Management Systems
Auxiliary Machinery Panels
The breaker protects cables, generators, motors, transformers, control systems, and shipboard electrical equipment from damage.
The Terasaki TL Series is widely used for marine power distribution and protection applications. These breakers are known for strong mechanical construction, stable trip performance, and long service life.
Common TL Series Models:
TL-225F
TL-400E
TL-600F
TL-800F
Available Current Ratings may include:
125A | 150A | 175A | 200A | 225A | 250A | 300A | 400A | 600A | 800A
SM MARINE SERVICE™ supplies TL Series breakers and replacement parts for marine switchboards and power panels.
The Terasaki XS Series is one of the most searched marine MCCB families. These breakers are commonly used in ship power distribution, generator feeders, motor feeders, and auxiliary equipment panels.
Popular XS Series Models:
XS50NS
XS50NB
XS50CS
XS100NS
XS100NB
XS225NS
XS400NS
XS400CS
XS600NE
XS800CS
Available Current Ratings may include:
50A | 75A | 100A | 125A | 150A | 175A | 200A | 225A | 250A | 300A | 400A | 600A | 800A
The XS400CS and XS400NS models are commonly used in marine generator protection, pump feeders, compressor circuits, and ship distribution boards.
The XH Series is used where higher performance and reliable current interruption are required.
Common XH Series Models:
XH225NS
XH250NS
Typical Applications:
Generator feeder protection
Heavy motor feeder protection
Emergency switchboard protection
Ship service transformer protection
The XE Series is often used for compact protection applications and distribution systems.
Common XE Series Model:
XE50NS
Typical Applications:
Small power distribution
Control panel protection
Auxiliary feeder protection
Automation panel protection
The EP Series is used in protection and control applications where compact and reliable breaker operation is required.
Common EP Series Model:
EP100-NN
Typical Applications:
Control circuits
Distribution panels
Auxiliary machinery panels
Small motor protection
Terasaki breakers often use accessories for remote control, automation, safety interlocks, and protection functions.
Important Accessory Models:
AVR-1C
AVR-1C 220V
AUR-1C
AUR-1CD
ARU-1DC
ATR-1
AMR-1B
ACR-212R
AGR-21BS-PS
XMB-3
EHS-1
4L
Common accessory types include:
Undervoltage Release
Shunt Trip
Auxiliary Contact
Alarm Contact
Motor Operator
Closing Coil
Opening Coil
UV Coil
Trip Unit
Overcurrent Relay
Protection Relay
Interlock Mechanism
Terminal Cover
Handle Mechanism
Terasaki marine electrical products are commonly divided into several protection categories.
Air Circuit Breakers, also known as ACB, are commonly used in main switchboards, generator breakers, and large distribution systems.
Molded Case Circuit Breakers, also known as MCCB, are widely used for feeder circuits, motor circuits, transformer protection, pump control, and distribution boards.
Miniature Circuit Breakers, also known as MCB, are used for smaller control and lighting circuits.
Earth Leakage Circuit Breakers, also known as ELCB or RCCB, are used for earth fault protection and personnel safety.
SM MARINE SERVICE™ can support Terasaki ACB, MCCB, MCB, ELCB, OCR, UVT, SHT, motor operator, protection relay, and breaker accessories.
Terasaki marine circuit breakers are commonly installed in:
Marine Main Switchboard
Emergency Switchboard
Generator Protection Panel
Auxiliary Generator Panel
Motor Control Center
Engine Room Distribution Panel
Cargo Pump Control Panel
Ballast Pump Control Panel
Fire Pump Starter Panel
Steering Gear Power Panel
Navigation Equipment Power Panel
Automation Control Panel
Shore Power Connection Panel
Transformer Protection Panel
Lighting Distribution Board
Battery Charger Distribution
Reliable Japanese engineering
Strong marine application history
High breaking capacity
Wide model range
Suitable for newbuilding and retrofit projects
Available accessories and protection relays
Good compatibility with marine switchboards
Long service life
Easy replacement in existing panels
Repair and reconditioning possible for many units
Before installing or replacing a Terasaki breaker, engineers should verify:
Exact model number
Rated current
Number of poles
Breaking capacity
Voltage rating
Trip unit type
Accessory configuration
Mounting dimensions
Busbar connection type
Panel compatibility
Protection coordination
Incorrect replacement can cause nuisance trips, protection failure, overheating, or unsafe operation.
Keep breaker terminals clean and tight.
Inspect for overheating marks.
Check insulation resistance.
Test ON/OFF mechanical operation.
Verify trip function.
Inspect shunt trip and undervoltage release operation.
Clean dust from breaker body.
Check busbar contact condition.
Replace damaged terminal covers.
Confirm current setting before operation.
Use correct torque when tightening power terminals.
Breaker trips frequently:
Possible causes include overload, incorrect current setting, weak trip unit, downstream fault, or motor starting current issue.
Breaker does not trip:
Possible causes include faulty trip unit, mechanical damage, incorrect installation, or protection relay failure.
Breaker cannot close:
Possible causes include undervoltage release not energized, interlock active, mechanical lock, or internal damage.
Breaker overheats:
Possible causes include loose terminals, overload, poor busbar contact, corrosion, or incorrect rating.
Remote trip not working:
Possible causes include faulty shunt trip coil, wiring fault, control voltage mismatch, or auxiliary contact issue.
No alarm contact signal:
Possible causes include auxiliary contact failure, wiring issue, or incorrect accessory configuration.
When replacing a Terasaki circuit breaker, match the following information:
Series
Model number
Rated current
Voltage rating
Breaking capacity
Number of poles
Trip unit type
Accessory type
Mounting type
Terminal connection
Panel clearance
For example, if replacing an XS400CS 400A breaker, do not only match the ampere rating. The breaking capacity, trip setting, accessory configuration, pole type, and mounting dimensions must also be checked.
TL-225F
TL-400E
TL-600F
TL-800F
XS50NS
XS50NB
XS50CS
XS100NS
XS100NB
XS225NS
XS400NS
XS400CS
XS600NE
XS800CS
XH225NS
XH250NS
XE50NS
EP100-NN
AVR-1C
AVR-1C 220V
AUR-1C
AUR-1CD
ARU-1DC
ATR-1
AMR-1B
AGR-21BS-PS
ACR-212R
XMB-3
EHS-1
4L
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What is a Terasaki circuit breaker used for?
A Terasaki circuit breaker is used to protect ship electrical circuits from overload, short circuit, earth fault, and abnormal electrical conditions.
Is XS400CS suitable for marine use?
Yes. XS400CS is commonly used in marine electrical panels, generator feeders, motor feeders, and distribution circuits.
Can Terasaki breakers be reconditioned?
Yes. Many Terasaki breakers can be cleaned, tested, repaired, and reconditioned depending on their physical and electrical condition.
Do you supply used Terasaki breakers?
Yes. SM MARINE SERVICE™ supplies used and professionally reconditioned Terasaki breakers depending on stock availability.
Can you supply accessories?
Yes. We can supply shunt trip, undervoltage release, auxiliary contact, motor operator, trip unit, protection relay, and other accessories.
What information is needed for quotation?
Please provide model number, ampere rating, pole number, voltage, photo of nameplate, accessory requirement, and quantity.
Do you ship worldwide?
Yes. SM MARINE SERVICE™ provides worldwide delivery.
Terasaki marine circuit breakers are reliable electrical protection devices used in ship switchboards, generator panels, motor control centers, emergency power systems, and marine distribution boards. SM MARINE SERVICE™ supplies new, used, and professionally reconditioned Terasaki MCCB, ACB, accessories, protection relays, and spare parts for worldwide marine customers.
SM MARINE SERVICE™ supplies new, used, and professionally reconditioned Terasaki marine circuit breakers and electrical protection spare parts.
We provide:
Worldwide Supply
Bangladesh Stock
China Stock
New Equipment
Used Equipment
Reconditioned Equipment
Technical Support
Repair & Testing
Spare Parts Sourcing
Fast International Delivery
Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh
China Warehouse & Support Center
Shanghai, China
Website
www.smmarineservice.com
Email
info@smmarineservice.com
WhatsApp
+8801818929292
Marketing Contact
Nazmul Hasan Bhuiyan
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