1TVS151800S3611 ABB EPX-4003-E2-MCCB 400A 3-Pole Electronic LSI MCCB XT5 Protecta Power

Why Choose the ABB EPX-4003-E2-MCCB 400A 3-Pole Electronic LSI MCCB?

The ABB EPX-4003-E2-MCCB, manufacturer order code 1TVS151800S3611, is a 400 A three-pole electronic LSI moulded-case circuit breaker (MCCB) based on the ABB Tmax XT5 platform. Part of the ABB Protecta Power Enclosures product group, it is designed for low-voltage electrical distribution applications requiring automatic circuit protection with adjustable electronic trip characteristics.

Officially described as the 400A 3P Electronic LSI MCCB - XT5, the EPX-4003-E2-MCCB combines a 400 A current rating, three-pole construction and LSI electronic protection. The LSI designation identifies three protective functions: long-time overload protection (L), short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I).

ABB's Protecta Power documentation distinguishes electronic LSI trip units from LS/I arrangements. With LSI protection, the long-time, short-time and instantaneous characteristics are available for adjustment, allowing electrical designers to configure protection settings according to the installation and the manufacturer's permitted adjustment ranges.

For professional panel builders, electrical contractors and switchgear manufacturers, the ABB EPX-4003-E2-MCCB provides an XT5-based protective device for compatible low-voltage distribution assemblies. Its electronic trip functionality supports the design of coordinated electrical protection systems where overload response, short-circuit protection and selectivity must be considered together.

Key Advantages

• 400 A rated MCCB for suitable low-voltage power distribution circuits.
• Three-pole (3P) configuration for three-phase electrical protection.
• Based on the ABB Tmax XT5 moulded-case circuit breaker platform.
• Electronic LSI protection with long-time, short-time and instantaneous trip functions.
• Adjustable protective characteristics to support application-specific circuit protection settings.
• Automatic overload and short-circuit protection within the device's specified operating limits.
• Supports electrical protection coordination and selectivity studies.
• Suitable for compatible ABB Protecta Power distribution assemblies.
• Offers electronic protection functionality as an alternative to thermal-magnetic MCCBs.
• Dedicated ABB order code 1TVS151800S3611 supports accurate identification and procurement.

Key Features

• ABB EPX-4003-E2-MCCB electronic-trip moulded-case circuit breaker.
• 400 A rated current designation.
• Three-pole (3P) configuration.
• ABB Tmax XT5 device platform.
• Electronic LSI trip protection.
• L function: Long-time overload protection.
• S function: Short-time delayed short-circuit protection.
• I function: Instantaneous short-circuit protection.
• Electronic trip settings for protective coordination within the manufacturer's specified limits.
• Automatic circuit interruption in response to qualifying overload and short-circuit conditions.
• Manual circuit switching capability.
• Designed for professional low-voltage distribution equipment.
• Part of the ABB Protecta Power product family.
• Suitable for use with manufacturer-approved XT5 installation and connection accessories.
• Distinct from a non-automatic switch disconnector.
• ABB manufacturer order code 1TVS151800S3611.

Specification note: The exact short-circuit breaking capacity, rated operational voltage, trip adjustment ranges, terminal configuration, dimensions and approved installation arrangements should be confirmed against the ABB documentation for order code 1TVS151800S3611. The 400 A current rating does not, by itself, establish the device's short-circuit breaking capacity.

Understanding Electronic LSI Protection

The principal feature of the ABB EPX-4003-E2-MCCB is its electronic LSI trip functionality. Unlike a conventional thermal-magnetic circuit breaker, an electronic-trip MCCB uses electronic protection technology to evaluate electrical current and operate the breaker when the applicable protective thresholds and timing conditions are reached.

The long-time (L) protection function is intended to protect electrical circuits against sustained overload conditions. This function helps prevent prolonged currents above the permitted operating level from causing excessive heating in conductors and associated distribution equipment.

The short-time (S) protection function responds to short-circuit conditions with an adjustable delayed response, subject to the capabilities of the fitted trip unit. This can be important where the electrical designer wishes to coordinate the incoming breaker with downstream protective devices so that an appropriate downstream device has an opportunity to clear a fault first.

The instantaneous (I) protection function provides rapid operation in response to qualifying high-current short-circuit conditions. The appropriate instantaneous threshold must be selected with reference to the prospective fault current, equipment ratings and the overall protection study.

ABB's Protecta Power product literature describes Ekip LSI as providing all three L, S and I protective characteristics for adjustability. This distinguishes it from Ekip LS/I arrangements, where the available short-circuit protection configuration differs. The correct trip technology should be selected according to the required protection functions rather than current rating alone.

Electronic LSI protection can be particularly valuable in distribution systems with multiple protective devices. Appropriate adjustment of overload and short-circuit characteristics can support improved protection coordination, although selectivity is not automatic and must be verified using the relevant ABB coordination data.

ABB Tmax XT5 Circuit Breaker Platform

The ABB Tmax XT5 platform is part of ABB's moulded-case circuit breaker range for low-voltage electrical distribution. The XT5 family includes devices with different current ratings and trip technologies, allowing designers to select protective equipment according to the characteristics of the circuit.

The EPX-4003-E2-MCCB is specifically designated as a 400 A three-pole XT5 electronic LSI MCCB. Its three-pole arrangement is intended for protection of three phase conductors in suitable three-phase electrical systems.

The correct MCCB selection depends on more than its rated current. The electrical designer must also consider the prospective short-circuit current, rated breaking capacity, operational voltage, conductor sizing, protective coordination and installation conditions. These factors determine whether the selected breaker is suitable for the intended distribution circuit.

ABB manufactures XT5 devices with different breaking-capacity classifications and electronic trip configurations. The exact variant supplied under the EPX-4003-E2-MCCB order code must therefore be verified before specifying a particular breaking capacity, terminal arrangement or optional accessory.

When integrating the breaker into a Protecta Power panelboard, only ABB-approved mechanical supports, electrical connections, covers and associated accessories should be used. Compatibility must be confirmed for the selected panelboard model and installation position.

Integration with ABB Protecta Power Distribution Systems

The ABB Protecta Power range provides a modular approach to commercial and industrial low-voltage distribution. It incorporates panelboard enclosures, protective devices and installation accessories intended to form coordinated electrical distribution assemblies.

The EPX-4003-E2-MCCB belongs to this wider product family and is intended for compatible distribution applications requiring a 400 A three-pole electronic LSI protective device. The exact approved panelboard arrangement should be checked against the current ABB selection guide and assembly instructions.

Where the device is used as part of an incoming protection arrangement, the electrical design must consider the panelboard busbar rating, incoming conductor arrangement, connection components and downstream circuit protection. The MCCB's rated current must remain consistent with the current-carrying capacity of the complete assembly.

For outgoing circuit applications, the designer must confirm that the selected panelboard provides the required mounting, connection space and approved accessories for an XT5 device. A suitable side cableway or extension arrangement may be necessary where larger conductors require additional installation space.

ABB's Protecta Power documentation also identifies electronic LSI protection as a distinct option from thermal-magnetic and LS/I trip technologies. Selecting the correct version allows the protection scheme to reflect the operating characteristics of the installation.

The EPX-4003-E2-MCCB is a circuit breaker, not a complete distribution panelboard. The enclosure, mounting and connection accessories, outgoing devices and any additional metering or cable-management components must be specified separately unless their inclusion is expressly confirmed by the supplier.

Typical Applications

• Compatible ABB Protecta Power low-voltage distribution assemblies.
• 400 A three-phase circuit protection.
• Commercial building electrical distribution.
• Industrial MCCB panelboards.
• Electrical distribution systems requiring electronic LSI protection.
• Main and sub-distribution boards with coordinated protective devices.
• Electrical plant rooms and switchgear installations.
• Office buildings and commercial developments.
• Retail centres and mixed-use properties.
• Warehouses and logistics facilities.
• Manufacturing and industrial premises.
• Infrastructure electrical distribution projects.
• Professional switchgear manufacturing and panel building.
• Electrical installations requiring adjustable overload and short-circuit protection characteristics.