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Air Circuit Breaker
TERASAKI ELECTRIC CO., LTD.
Refurbished
The TERASAKI TemPower AR325S is a heavy-duty low-voltage Air Circuit Breaker (ACB) designed for electrical power distribution and protection. In marine installations, ACBs of this class are commonly associated with main switchboards and generator distribution systems, where reliable switching and overcurrent protection are critical.
The photographed AR325S is manufactured by Terasaki Electric Co., Ltd., Japan and carries a 2500A maximum rating on its nameplate.
Terasaki's official TemPower2 range also includes AR208S, AR212S, AR216S, AR220S, AR325S, AR332S and AR440-series breakers, allowing the platform to cover multiple current ratings and switchboard requirements.
Manufacturer: TERASAKI ELECTRIC CO., LTD.
Series: TemPower / TemPower2
Model: AR325S
Equipment Type: Air Circuit Breaker (ACB)
Maximum Rated Current: 2500A
Number of Poles: 3P / 4P configurations within the documented AR325S family
Rated Insulation Voltage: 1000V
Application: Marine and industrial electrical power distribution
Mounting: Fixed and draw-out arrangements are documented for the AR325S family
Country of Origin: Japan
Official Terasaki technical information identifies the AR325S as a 2500A frame/model, while the broader TemPower2 standard range extends from AR208S through higher-current AR440-series breakers.
An Air Circuit Breaker is a major protection and switching component of a low-voltage electrical distribution system.
On vessels, ACBs may be installed in systems such as:
When an abnormal electrical condition occurs, the breaker and its protection system are designed to interrupt the affected circuit according to the configured protection characteristics.
This makes the ACB much more than a simple ON/OFF switch—it is a critical component of vessel electrical protection.
One reason we are targeting the complete family in this blog is that shipowners often search by ampere rating rather than exact breaker model.
Terasaki documentation identifies standard TemPower2 types including:
AR208S – 800A
AR212S – 1250A
AR216S – 1600A
AR220S – 2000A
AR325S – 2500A
AR332S – 3200A
AR440S / AR440SB – 4000A class
High-performance AR-series variants also exist, including models such as AR212H, AR216H, AR220H, AR316H, AR320H, AR325H and AR332H.
Therefore, customers searching for a 1000A, 1500A, 2000A, 2500A, 3000A or other marine ACB requirement can contact SM MARINE SERVICE™ with the breaker nameplate, switchboard details and required rating so that the correct replacement can be checked.
Depending on configuration, a TemPower2 ACB assembly can include the breaker body, draw-out cradle, main and control circuit terminals, auxiliary/position switches, ON/OFF operating mechanism, closing coil, tripping device and electronic overcurrent release.
Terasaki documentation specifically lists overcurrent protection families including AGR-11B, AGR-21B, AGR-22B and AGR-31B for applicable TemPower2 draw-out breakers.
These details are important when sourcing a replacement because two breakers with a similar current rating may have different protection units, accessories, poles, terminals or installation arrangements.
TERASAKI ACBs can be encountered aboard many vessel categories, including merchant vessels, bulk carriers, container ships, oil and chemical tankers, LNG/LPG vessels, offshore support vessels, dredgers, tugboats and other commercial ships.
When requesting a replacement, buyers should ideally provide a clear photograph of the complete nameplate and OCR/protection unit.
Typical service complaints involving marine ACBs include the breaker failing to close, failing to charge, unexpected tripping, difficulty moving a draw-out breaker between positions, worn operating mechanisms, defective auxiliary contacts, closing or trip-coil problems, and overcurrent-release issues.
Troubleshooting should begin with the breaker isolated according to the vessel's approved electrical safety procedures. Check the control supply, spring-charge condition, interlocks, trip indication, OCR status and auxiliary control circuit before replacing components.
Never bypass a protection or safety interlock simply to force an ACB to close.
Terasaki's instruction documentation also emphasizes that installation, servicing and inspection must be performed correctly and provides dedicated maintenance and troubleshooting procedures.
SM MARINE SERVICE™ can assist customers sourcing complete marine ACBs and associated replacement parts, subject to model and stock availability.
Requirements may include complete breaker assemblies, draw-out breaker bodies, cradle assemblies, overcurrent releases/OCR units, closing coils, shunt-trip devices, charging motors, auxiliary contacts, control accessories and related switchboard electrical components.
Available sourcing conditions can include:
New • Used • Refurbished • Reconditioned • Tested Working
For an exact replacement inquiry, please provide:
Maker + Model + Ampere Rating + Pole Configuration + Voltage + OCR Type + Nameplate Photo + Existing Breaker Photos.
This is especially important for older vessel switchboards where changing the complete switchboard merely because one breaker is obsolete can be impractical.
A vessel may remain operational for decades. As a result, existing switchboards can continue using breaker models that are older than the newest product generation.
For maintenance teams, the priority is often finding a technically suitable replacement breaker or spare component while preserving compatibility with the existing switchboard.
Terasaki continues to publish technical information, manuals and dimensional data covering numerous TemPower2 AR-series models, which is valuable when identifying and maintaining existing installations.
SM MARINE SERVICE™ is not limited to the TERASAKI AR325S 2500A shown here.
Customers can contact us for marine electrical circuit breakers by sending the existing breaker nameplate and technical requirement.
Typical searches we support include:
Marine ACB • Generator ACB • Main Switchboard ACB • 800A ACB • 1000A ACB • 1250A ACB • 1500A ACB • 1600A ACB • 2000A ACB • 2500A ACB • 3000A ACB • 3200A ACB • 4000A ACB • Draw-Out ACB • 3-Pole ACB • 4-Pole ACB • Replacement ACB • Used Marine ACB • Reconditioned Marine Circuit Breaker.
What is the rating of TERASAKI AR325S?
Terasaki's published TemPower2 data identifies AR325S as a 2500A model.
Is the AR325S available as 3-pole and 4-pole?
Terasaki technical/CAD documentation lists AR325S arrangements for both 3P and 4P applications.
Can I replace a 2000A breaker with a 2500A AR325S?
Not simply based on ampere rating. Breaker selection must consider switchboard design, protection coordination, voltage, poles, breaking capacity, mounting/cradle configuration, terminals, accessories and manufacturer requirements.
Can SM MARINE SERVICE™ supply used or refurbished ACBs?
Yes, depending on current availability, we can source new, used, refurbished, reconditioned and tested-working marine electrical equipment.
I don't know my ACB model. Can you identify it?
Send clear photographs of the front, nameplate, OCR/protection unit, rear connections and cradle. We can use those details to assist with identification and sourcing.
Do you supply ACBs worldwide?
SM MARINE SERVICE™ supports international marine customers and worldwide shipment arrangements.
TERASAKI TemPower AR325S 2500A Air Circuit Breaker (ACB) for marine generator and main switchboard electrical protection systems. SM MARINE SERVICE™ supplies complete Terasaki marine ACBs, replacement breakers, OCR units and associated spare parts in new, used, refurbished and reconditioned condition, subject to availability, with worldwide shipping and sourcing support.
???? TERASAKI TemPower2 Air Circuit Breaker Instruction Manuals
The manufacturer's official manual library covers TemPower2 AR-series air circuit breakers and applicable AGR overcurrent protection units.
Download / View Official TERASAKI Air Circuit Breaker Manuals
???? TERASAKI TemPower2 Technical & Dimension Data
Official technical data includes AR208S, AR212S, AR216S, AR220S, AR325S, AR332S and other AR-series configurations.
View Official TERASAKI TemPower2 Technical Data
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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