The Terasaki AT20 Tempower Air Circuit Breaker is a high-performance three-pole circuit protection device manufactured by Terasaki Electric Co., Ltd. under the Matsushita Tempower brand. Designed for critical power distribution applications, this ACB delivers a robust 2000A current rating at 690V AC, providing reliable protection for industrial and marine electrical systems where operational continuity is paramount. Aeliya Marine Tech proudly supplies this premium air circuit breaker to clients who demand the highest standards of electrical protection for their infrastructure.

Air circuit breakers are the ultimate line of defense in low-voltage power distribution systems, responsible for clearing fault currents and isolating electrical faults before they can cause catastrophic damage to equipment or endanger personnel. The Terasaki AT20 Tempower series has earned a distinguished reputation across Asia-Pacific and global markets for its exceptional build quality, precise protection characteristics, and long service life. The Category B utilization classification ensures that this breaker can be selectively coordinated with downstream protective devices, a critical requirement in complex distribution networks where fault isolation precision directly impacts system availability.

Key Features & Specifications

The Terasaki AT20 Tempower incorporates design features that have made it a preferred choice among electrical engineers specifying protection for mission-critical power systems. Its robust contact system, precision trip unit, and durable arc chutes deliver consistent performance across thousands of operations.

• Rated Current (In): 2000A for high-capacity distribution systems
• Operational Voltage (Ue): 690V AC three-phase
• Poles: 3-pole configuration for standard industrial applications
• Frequency: 50/60 Hz for global compatibility
• Utilization Category: Category B for selective coordination
• Standard: IEC 947-2 compliance for international acceptance
• Brand: Matsushita Tempower - Terasaki Electric quality
• Proven Design: Extensive track record in Asian and global markets

Technical Specifications

Specification	Details
Product Name	Terasaki AT20 Tempower Air Circuit Breaker
Manufacturer	Terasaki Electric Co., Ltd.
Brand	Matsushita Tempower
Type	Air Circuit Breaker AT20
Poles	3
Operational Voltage (Ue)	690V AC
Rated Frequency	50/60 Hz
Rated Current (In)	2000 A
Standard	IEC 947-2
Utilization Category	B
Condition	Used
SKU	71969

Applications & Use Cases

The Terasaki AT20 Tempower Air Circuit Breaker serves as primary protection in a diverse range of industrial and commercial power distribution applications. In marine switchboards, the AT20 protects main generators and bus tie connections, ensuring that fault conditions are cleared rapidly to prevent damage to expensive shipboard electrical equipment. Terasaki's reputation in the Asian maritime industry makes this breaker a common specification in shipyards across Japan, South Korea, and Singapore.

Onshore, the AT20 is extensively deployed in industrial plant main switchgear, data center power distribution units, and hospital electrical infrastructure where power reliability is safety-critical. The 2000A rating accommodates the substantial loads of large facilities, while the IEC 947-2 certification ensures acceptance by inspectors and consultants worldwide. The Category B selective coordination capability is particularly valued in healthcare and data center applications where even momentary outages can have severe consequences.

Why Choose the Terasaki AT20 Tempower

Terasaki Electric Co., Ltd. has been manufacturing circuit protection equipment since 1923, and the AT20 Tempower series represents the culmination of nearly a century of expertise in low-voltage switching devices. The Matsushita Tempower brand is synonymous with quality in Asian industrial markets, and the AT20 has earned the trust of electrical engineers who specify it for their most critical installations. When you choose the AT20, you are selecting a breaker with a proven operational history in some of the world's most demanding electrical environments.

Aeliya Marine Tech enhances this value proposition with our rigorous quality assurance process, 30-day warranty coverage, and complimentary shipping service. Our technical team understands the urgency that often accompanies air circuit breaker procurement, and we work to ensure rapid delivery to minimize your system downtime.

Compatibility & Integration

The Terasaki AT20 is designed for installation in Terasaki switchgear and compatible switchboard assemblies conforming to IEC 947-2 dimensional standards. The 690V AC rating covers the majority of low-voltage industrial distribution systems, while the 50/60 Hz frequency compatibility enables deployment in any region worldwide. When retrofitting this breaker into existing switchgear, verify that the installation dimensions, busbar connections, and arc flash containment systems are compatible with the AT20 specifications.

The trip unit provides adjustable over-current and short-circuit protection settings that should be configured to achieve selective coordination with upstream and downstream protective devices. Aeliya Marine Tech can provide guidance on protection coordination studies and setting recommendations to ensure optimal performance within your distribution architecture.

Maintenance & Support

Regular maintenance is essential for ensuring that air circuit breakers operate correctly when called upon to clear fault currents. Recommended maintenance for the AT20 includes visual inspection of contacts, testing of the trip unit calibration, lubrication of mechanical linkages, and verification of closing and opening times. Aeliya Marine Tech provides comprehensive support including our 30-day warranty, technical consultation, and access to Terasaki product documentation to assist your maintenance program.

Frequently Asked Questions

Q1: What is the rated current of the Terasaki AT20?

The AT20 has a rated current of 2000A at 690V AC, suitable for high-capacity industrial and marine power distribution systems.

Q2: What standard does this breaker comply with?

The Terasaki AT20 complies with IEC 947-2, the international standard for low-voltage switchgear and controlgear circuit breakers.

Q3: What is the utilization category of the AT20?

The breaker is classified as Category B, meaning it provides short-time withstand capability for selective coordination with downstream protective devices.

Q4: Who manufactures the Terasaki AT20?

The AT20 is manufactured by Terasaki Electric Co., Ltd. under the Matsushita Tempower brand, a respected name in Asian industrial electrical equipment.

Q5: Is this breaker suitable for marine applications?

Yes, the AT20 is widely used in marine switchboards for generator protection and main distribution, particularly in Asian shipbuilding markets.

Q6: What warranty does Aeliya Marine Tech provide?

Aeliya Marine Tech offers a 30-day warranty on this used Terasaki AT20 with free shipping on all orders.

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