ABB SACE Emax air circuit breakers provide protection and switching for low-voltage power distribution systems. The range covers six frame sizes—X1, E1, E2, E3, E4 and E6—with rated-current options from 400 to 6300 A, breaking capacities up to 150 kA, and fixed or withdrawable installation in 3-pole and 4-pole configurations.
The ABB SACE Emax Air Circuit Breaker (ACB) is a legacy low-voltage circuit breaker series designed for high-current electrical distribution and protection applications. Covering rated uninterrupted currents from 800 A to 6,300 A across five frame sizes, E1, E2, E3, E4 and E6, the series provides overload and short-circuit protection for industrial and commercial power systems. Available in fixed and withdrawable configurations, the Emax range features electronic PR trip units, modular construction and multiple breaking capacity options for integration into low-voltage switchboards and power distribution assemblies.
The SACE Emax series uses electronic PR111, PR112 and PR113 trip units to provide circuit protection and monitoring functions. Depending on the selected trip unit, available protection functions include overload, short-time and instantaneous short-circuit protection, as well as additional protection settings for different electrical system requirements. Selected versions feature LCD displays and current harmonic analysis, supporting electrical system monitoring and fault assessment.
Designed for high-current power distribution applications, the SACE Emax series offers multiple breaking capacity configurations to accommodate different short-circuit conditions. Its modular circuit breaker design supports reliable switching and fault interruption in low-voltage electrical networks. The series also includes selective current-limiting versions for applications requiring specific protection coordination characteristics.
The SACE Emax series is available in fixed and withdrawable configurations to accommodate different switchboard designs and maintenance requirements. Its modular construction supports flexible integration into industrial power distribution assemblies. Compatible operating mechanisms, auxiliary contacts and electrical accessories provide additional options for control, signaling and installation.
The ABB SACE Emax ACB series was designed for high-capacity low-voltage electrical distribution applications, including:
Industrial Switchboards: Main circuit protection in manufacturing and processing facilities.
Power Distribution Systems: Incoming and outgoing feeder protection in low-voltage networks.
Commercial Infrastructure: Main distribution protection in large buildings and infrastructure facilities.
Power Generation: Circuit protection in generator and auxiliary distribution systems.
Electrical Retrofit Projects: Replacement and retrofit solutions for existing Emax installations.
Frame Sizes: E1, E2, E3, E4 and E6.
Rated Uninterrupted Current (Iu): 800–6,300 A.
Breaking Capacity: Up to 150 kA at 440 V AC, 100 kA at 690 V AC and 65 kA at 1,000 V AC, depending on the model.
Pole Configuration: Three-pole and four-pole versions, depending on the product reference.
Trip Units: PR111, PR112 and PR113 electronic protection units.
Protection Functions: Electronic overload and short-circuit protection, with additional functions depending on the trip unit.
Installation: Fixed and withdrawable configurations.
Accessories: Auxiliary contacts, operating mechanisms and compatible switchboard accessories.
Standards: Original product versions included UL-certified configurations.
| Parameter | Specification |
| Product type | Low-voltage air circuit breaker (ACB) |
| Frame series | X1, E1, E2, E3, E4, E6 |
| Rated-current options (In) | 400–6300 A, by frame and rating plug |
| Ultimate breaking capacity (Icu) | 42–150 kA at 220–415 V AC, by grade |
| Service breaking capacity (Ics) | 42–150 kA at 220–415 V AC, by grade |
| Short-time withstand (Icw) | Up to 100 kA for 1 second, by grade |
| Rated operational voltage | Up to 690 V AC; selected /E versions up to 1150 V AC |
| Frequency | 50/60 Hz |
| Pole configuration | 3-pole / 4-pole |
| Installation type | Fixed (F) / Withdrawable (W) |
| Electronic trip units | SACE PR121/P, PR122/P, PR123/P, PR331/P, PR332/P |
| Applicable standards | IEC 60947, EN 60947, CEI EN 60947, IEC 61000 |
Breaking capacity ratings at 220–415 V AC. Rated-current options vary by frame and current plug.
| Model | Rated Current In (A) | Icu (kA) | Ics (kA) | Icw, 1 s (kA) |
| X1B | 400, 630, 800, 1000, 1250, 1600 | 42 | 42 | 42 |
| X1N | 400, 630, 800, 1000, 1250, 1600 | 65 | 50 | 42 |
| E1B | 800, 1000–1250, 1600 | 42 | 42 | 42 |
| E1N | 800, 1000–1250, 1600 | 50 | 50 | 50 |
| E1S | 800–1600 | 65 | 65 | 65 |
| E2B | 1600, 2000 | 42 | 42 | 42 |
| E2N | 1000–1250, 1600, 2000 | 65 | 65 | 55 |
| E2S | 800, 1000–1250, 1600, 2000 | 85 | 85 | 65 |
| E2L | 1250, 1600 | 130 | 130 | 10 |
| E3N | 2500, 3200 | 65 | 65 | 65 |
| E3S | 1000–1250, 1600, 2000, 2500, 3200 | 75 | 75 | 75 |
| E3H | 800, 1000–1250, 1600, 2000, 2500, 3200 | 100 | 85 | 75 |
| E3V | 800, 1250, 1600, 2000, 2500, 3200 | 130 | 100 | 85 |
| E3L | 2000, 2500 | 130 | 130 | 15 |
| E4S | 4000 | 75 | 75 | 75 |
| E4H | 3200, 4000 | 100 | 100 | 100 |
| E4V | 3200–4000 | 150 | 150 | 100 |
| E6H | 4000, 5000, 6300 | 100 | 100 | 100 |
| E6V | 3200, 4000, 5000, 6300 | 150 | 125 | 100 |
| Model | Configuration | Key Specification |
| E2B/E | High-voltage version | Up to 1150 V AC |
| E2N/E | High-voltage version | Up to 1150 V AC |
| E3H/E | High-voltage version | Up to 1150 V AC |
| E4H/E | High-voltage version | Up to 1150 V AC |
| E6H/E | High-voltage version | Up to 1150 V AC |
| E4S/f | Special /f version | Icu 80 kA at 220–415 V AC |
| E4H/f | Special /f version | Icu 100 kA at 220–415 V AC |
| E6H/f | Special /f version | Icu 100 kA at 220–415 V AC |
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