The Hyundai HIAN 20 Air Circuit Breaker is a high-capacity three-pole circuit protection device engineered by Hyundai Heavy Industries Co., Ltd. for demanding industrial and marine power distribution applications. Rated at an impressive 2000A with a 1000V insulation rating and 12kV impulse withstand voltage, this air circuit breaker (ACB) delivers superior protection for critical electrical infrastructure where reliability and safety are non-negotiable. At Auto2mation, we recognize that circuit breakers are the sentinels of electrical systems, and the HIAN 20 exemplifies the protection standards required by modern industrial facilities.

Air circuit breakers represent the highest tier of low-voltage circuit protection, designed to interrupt fault currents and protect electrical distribution systems from damage caused by overloads and short circuits. The Hyundai HIAN 20 stands out in its class with a Category B utilization classification, indicating its ability to provide selective coordination with downstream protective devices. This characteristic is essential in complex power distribution networks where fault isolation must be precise to maintain continuity of supply to unaffected portions of the system. With full Ics = 100% Icu rating, this breaker delivers breaking capacity equal to its service breaking capacity, ensuring reliable fault clearance under the most demanding conditions.

Key Features & Specifications

The Hyundai HIAN 20 incorporates advanced protection features and robust mechanical construction to deliver reliable service in the most challenging industrial environments. Its draw-out design facilitates maintenance and replacement without requiring complete system shutdown.

• Rated Current (In): 2000A for high-capacity power distribution
• Insulation Voltage (Ui): 1000V for robust electrical isolation
• Impulse Voltage (Uimp): 12kV for exceptional surge protection
• Poles: 3-pole configuration for three-phase systems
• Utilization Category: Category B for selective coordination
• Breaking Capacity: Ics = 100% Icu (full service breaking capacity)
• Icu at 600/690V: 65 kA
• Icu at 220/500V: 70 kA
• Short-Time Withstand (Icw): 70 kA/1s and 65 kA/1s
• Protection: Over-current and Ground Fault Trip unit
• Mounting: Draw-out type (2000AF) for easy maintenance

Technical Specifications

Specification	Details
Product Name	Hyundai HIAN 20 Air Circuit Breaker
Manufacturer	Hyundai Heavy Industries Co., Ltd.
Type	Air Circuit Breaker (ACB)
Poles	3 Poles
Rated Current (In)	2000A
Insulation Voltage (Ui)	1000V
Impulse Voltage (Uimp)	12 kV
Frequency	50/60 Hz
Icu at 600/690V	65 kA
Icu at 220/500V	70 kA
Icw	70 kA/1s, 65 kA/1s
Utilization Category	Category B
Standards	EN/IEC 60947-2, VDE 0660, GOST R 50030.2-99
Trip Unit	Over-current & Ground Fault (APR-IL-GL)
Mounting Type	Draw-out Type (2000AF)

Applications & Use Cases

The Hyundai HIAN 20 Air Circuit Breaker is engineered for deployment in high-current industrial power distribution systems where protection reliability directly impacts operational safety and productivity. In marine electrical systems, this ACB serves as the main incoming breaker on ship switchboards, protecting generators and distribution transformers from fault damage. Its 1000V insulation rating and 12kV impulse withstand capability make it exceptionally well-suited for marine environments where electrical stresses from switching transients and atmospheric conditions are significant.

Onshore, the HIAN 20 is deployed in industrial manufacturing facilities, power plants, and petrochemical complexes as the primary protection device for main switchgear assemblies. The 2000A rating accommodates the substantial power demands of large production facilities, while the 70 kA breaking capacity at 500V ensures reliable interruption of even severe fault currents. The Category B utilization classification enables selective coordination with downstream MCCBs and fuse protection, limiting outage scope to the minimum necessary during fault events.

The draw-out mounting configuration is particularly valued in critical infrastructure applications where maintenance windows are limited. Technicians can withdraw the breaker from its compartment for inspection, testing, or replacement without de-energizing the entire switchgear lineup. This feature significantly reduces downtime and enhances maintenance safety in data centers, hospitals, and continuous-process manufacturing plants.

Why Choose the Hyundai HIAN 20 Air Circuit Breaker

Hyundai Heavy Industries has established itself as one of the world's premier manufacturers of industrial and marine electrical equipment. The HIAN series air circuit breakers are engineered to the same exacting standards that have made Hyundai a trusted name in shipbuilding and heavy industry. When you select the HIAN 20, you benefit from comprehensive protection functions including over-current tripping and ground fault detection, all housed in a robust mechanical assembly designed for decades of reliable service.

Auto2mation adds further value with our expert inspection process, 30-day warranty protection, and complimentary shipping. Our team understands the urgency that accompanies circuit breaker procurement, whether for planned maintenance or emergency replacement. We work diligently to ensure your power distribution system maintains the highest levels of protection and reliability.

Compatibility & Integration

The Hyundai HIAN 20 is designed for integration into Hyundai switchgear assemblies and compatible third-party switchboards designed to IEC 60947-2 standards. The draw-out mechanism requires specific cradle dimensions that should be verified before procurement. The over-current and ground fault trip unit provides adjustable protection settings that can be configured to achieve selective coordination with upstream and downstream protective devices.

When installing this breaker, ensure that your switchgear busbar system is rated for at least 2000A continuous current and that the short-circuit withstand rating exceeds the prospective fault current at the installation location. Auto2mation's technical specialists can assist with compatibility verification and provide guidance on protection setting calculations to achieve optimal coordination with your existing distribution system.

Maintenance & Support

Regular maintenance of air circuit breakers is critical for ensuring reliable protection when faults occur. Recommended maintenance activities include inspecting main and arcing contacts for wear, lubricating the operating mechanism, testing the trip unit calibration, and verifying the draw-out mechanism functions smoothly. The trip unit should be tested periodically using primary injection test equipment to confirm that protection settings remain accurate.

Auto2mation supports your maintenance program with our 30-day warranty, technical consultation services, and access to Hyundai documentation. We understand that circuit breaker reliability is fundamental to electrical safety, and we are committed to helping you maintain protection systems that perform flawlessly when called upon.

Frequently Asked Questions

Q1: What is the rated current of the Hyundai HIAN 20?

The HIAN 20 has a rated current (In) of 2000A, making it suitable for high-capacity industrial power distribution applications.

Q2: What breaking capacity does this ACB offer?

The breaker offers 65 kA breaking capacity at 600/690V and 70 kA at 220/500V, with short-time withstand ratings of 70 kA/1s and 65 kA/1s.

Q3: What standards does the HIAN 20 comply with?

The breaker complies with EN/IEC 60947-2, VDE 0660, and GOST R 50030.2-99 standards for low-voltage switchgear and controlgear.

Q4: What type of trip unit is included?

The HIAN 20 includes an over-current and ground fault trip unit (APR-IL-GL) for comprehensive circuit protection.

Q5: Is this a draw-out type breaker?

Yes, the HIAN 20 features a draw-out type mounting (2000AF), enabling easy withdrawal for maintenance and replacement.

Q6: What warranty does Auto2mation provide?

Auto2mation provides a 30-day warranty on this used Hyundai HIAN 20 Air Circuit Breaker with free shipping on all orders.

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