1SDA057887R1 ABB E4H-A 3200 PR121/P-LSIG 3200 A 3-Pole Air Circuit Breaker

Why Choose the ABB E4H-A 3200 PR121/P-LSIG Air Circuit Breaker?

The ABB 1SDA057887R1 is a high-performance Emax E4H-A 3200 air circuit breaker (ACB) designed for protection and switching of high-current low-voltage electrical distribution systems. Part of the ABB New Emax range, this fixed three-pole circuit breaker combines a 3200 A frame rating with the electronic PR121/P-LSIG trip unit for comprehensive overload, short-circuit and earth-fault protection.

The E4H-A performance level is engineered for demanding industrial and commercial power distribution applications where high short-circuit capability and dependable selective protection are required. Its PR121/P electronic trip unit provides Long-time, Short-time, Instantaneous and Ground-fault protection functions, identified by the LSIG designation, allowing the breaker to protect conductors, switchgear and connected equipment against a broad range of electrical faults.

With a rated current of 3200 A, three-pole configuration and a rated short-circuit current of 85 kA at 480 V AC, the E4H-A 3200 is suited to substantial low-voltage distribution systems. ABB order code 1SDA057887R1 identifies the fixed version equipped with the PR121/P-LSIG trip unit and horizontal rear terminals.

Key Advantages

• High-capacity ABB Emax air circuit breaker for low-voltage power distribution.
• 3200 A rated current for high-current industrial installations.
• 85 kA short-circuit capability at 480 V AC for demanding distribution systems.
• Electronic PR121/P-LSIG trip unit providing comprehensive circuit protection.
• LSIG protection covers Long-time, Short-time, Instantaneous and Ground-fault functions.
• Fixed three-pole construction suited to switchboards, distribution panels and industrial power systems.

Key Features

• ABB New Emax E4H-A series.
• 3200 A frame and rated current.
• Three-pole configuration.
• PR121/P electronic trip unit.
• LSIG protection functions for overload, selective short-circuit, instantaneous short-circuit and earth-fault protection.
• 85 kA rated short-circuit current at 480 V AC.
• 85 kA rated short-time current.
• Fixed circuit breaker construction with horizontal rear terminals.

Reliable Circuit Protection for High-Current Power Distribution

Air circuit breakers such as the ABB Emax E4H-A protect low-voltage distribution systems against overloads and short circuits while also providing controlled switching of high-current electrical circuits. Their high interruption capability makes them particularly suitable for main incomers, bus couplers and feeder applications in industrial switchgear.

The PR121/P-LSIG electronic trip unit provides adjustable protection characteristics for coordinated electrical distribution. Long-time protection responds to sustained overload conditions, Short-time protection supports selective coordination, Instantaneous protection responds rapidly to severe short circuits, and Ground-fault protection helps detect potentially damaging earth-fault currents.

Typical Applications

• Main incoming circuit protection in low-voltage switchboards.
• Industrial power distribution systems.
• Bus coupler and bus-section circuit breaker applications.
• High-current feeder protection.
• Manufacturing plants and process facilities.
• Commercial buildings, infrastructure and large electrical installations.