ABB SACE E6H 6300A 4-Pole Air Circuit Breaker

ABB SACE E6H 6300 Amp 4-Pole Air Circuit Breaker (Emax Series)

The ABB SACE Emax E6H 6300 is a 4-pole low-voltage Air Circuit Breaker (ACB) engineered for high-demand power generation, shipboard main switchboards, large industrial substations, and critical infrastructure installations. Rated at a continuous thermal carrying current of 6300 Amperes at 40°C and an operational voltage up to 690V AC, the E6H frame is designed to endure extreme thermal stresses and high electrodynamic prospective fault levels.

Comes with advanced microprocessor-based protection trip units—such as the PR121/P, PR122/P, or PR123/P—the E6H provides selective coordination across selective L-S-I-G thresholds. Its 4-pole design provides complete isolation and protection for systems with unbalanced harmonic loads, high non-linear current distortion, and floating marine earth distribution networks.

Model Details

• Product Series: ABB SACE Emax New Series (Frame E6)
• Frame Classification: E6H (High Breaking Performance)
• Continuous Operational Rating: 6300A
• Number of Poles: 4 Poles (4P) – Phase A, B, C, Neutral
• Standard Terminal Orientation: Rear Horizontal (HR) / Rear Vertical (VR) Heavy-Duty Copper Pad Formats

Manufacturer Part Numbers

• 1SDA057021R1: E6H 6300 PR122/P-LSIG In=6300A 4p F HR (Fixed, Rear Horizontal)
• 1SDA057032R1: E6H 6300 PR121/P-LI In=6300A 4p W MP (Withdrawable Moving Part)
• 1SDA057033R1: E6H 6300 PR122/P-LSI In=6300A 4p W MP (Withdrawable Moving Part)
• 1SDA057035R1: E6H 6300 PR122/P-LSIG In=6300A 4p W MP (Withdrawable Moving Part)
• 1SDA057036R1: E6H 6300 PR123/P-LSI In=6300A 4p W MP (Advanced Measurement/Harmonics)
• 1SDA057037R1: E6H 6300 PR123/P-LSIG In=6300A 4p W MP (Differential & Directional Protection)
• 1SDA055587R1: E6H/f 6300 PR122/P-LI In=6300A 4p F HR (Full Size Neutral Execution)
• 1SDA059670R1: Fixed Part / Cradle Guide Frame E6 4P W FP HR (Rear Horizontal Cradle)

Technical Specifications

Key Features

1. Full 100 kA Fault Interruption at 100 Percent Service Rating: Handles severe short circuit events up to 100 kA at 690V without contact welding or mandatory mechanical rebuilds.
2. Advanced Electronic Trip Protection: PR121, PR122, and PR123 trip units provide selective adjustment across overload, delayed short circuit, instantaneous trip, and ground fault protection bands.
3. True Four Pole Isolation: Complete four pole architecture prevents circulating neutral currents, isolates neutral during shipboard parallel generator operations, and guards against triplen harmonic heating.
4. Modular Drawout Construction: The withdrawable format allows operators to rack the unit through Connected, Test, and Disconnected positions behind a closed switchboard door.
5. Double Insulated Kinematic Mechanism: Heavy duty spring energy stored mechanism isolates the operating face from internal high voltage arc chutes during charging and switching operations.

Applications

• Marine Main Switchboards: Primary generator incoming protection and shipboard bus tie breakers on LNG vessels, dynamic positioning drillships, oil tankers, and large passenger cruise vessels.
• Offshore Platforms and FPSO Units: High capacity distribution skids on Floating Production Storage and Offloading vessels subject to continuous vibration and salt laden atmospheres.
• Data Center Unit Substations: Main incoming protection downstream of 2500 kVA and 3000 kVA step down transformers feeding critical continuous server loads.
• Heavy Industrial Smelting and Rolling Mills: Heavy duty feeder protection for metal processing lines, high power rectifiers, and chemical electrolysis cells running near maximum thermal capacity.
• Power Generation Substations: Low voltage alternator breakers on containerized diesel and natural gas turbine generator packages operating in continuous parallel grid ties.

Frequently Asked Questions

What is the continuous current rating of the ABB SACE E6H 6300 breaker?

The breaker carries a continuous uninterrupted rating of 6300 Amperes at an ambient reference temperature of 40 degrees Celsius. When installed inside enclosed marine switchboards where ambient temperatures reach 45 to 55 degrees Celsius, engineering derating tables must be applied to limit continuous loading to between 5700A and 5900A depending on enclosure ventilation.

What is the difference between Fixed and Withdrawable executions of the E6H?

A Fixed circuit breaker is bolted permanently to the switchboard structure with copper busbars directly secured to its rear terminals. A Withdrawable breaker consists of a stationary cradle and a movable breaker chassis that can be mechanically racked into Connected, Test, and Disconnected positions, allowing maintenance and inspection without de energizing the switchboard main busbars.

What does a 100 percent Ics rating mean for the E6H breaker?

An Ics rating equal to 100 percent of Icu indicates that the circuit breaker can clear a full prospective short circuit fault of 100 kA at rated voltage, withstand the dynamic stress, and remain fully operational and capable of carrying continuous rated load without requiring immediate replacement of internal contact assemblies.

Can a PR121 trip unit be upgraded to a PR122 or PR123 on an existing breaker?

Yes, the PR121, PR122, and PR123 electronic trip modules share an identical physical front interface and plug directly into the internal rating plugs and Rogowski current sensors. Upgrading to a PR122 or PR123 enables advanced functions such as directional short circuit protection, power and voltage measurement modules, Modbus serial communications, and event data logging.

Why is a 4 pole circuit breaker critical in marine power networks?

A 4 pole breaker provides complete galvanic disconnection of all three phase lines and the neutral conductor simultaneously. In marine installations with parallel diesel generators, non linear loads, and variable frequency propulsion drives, a 4 pole breaker prevents circulating harmonic currents across common neutral paths and ensures proper safety isolation during system maintenance.

What tests should be completed prior to commissioning a surplus or reconditioned E6H?

Before energization, technicians must conduct contact resistance measurements across all four poles using a 100A micro ohmmeter, execute a 1000V DC insulation resistance Megger test across phases and to ground, inject test currents through the trip unit using an ABB secondary injection test set, and verify opening and closing spring charge times.