1SDX255121R1 ABB EPX-XT4S-TM0204 20A 4-Pole 50kA MCCB TMA

Why Choose the ABB EPX-XT4S-TM0204 20A 4-Pole 50kA MCCB?

The ABB EPX-XT4S-TM0204 is a robust 20 A four-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection for commercial and industrial low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker combines a 50 kA short-circuit breaking capacity with TMA thermal-magnetic protection, making it a practical choice for electrical installations requiring a relatively low rated current, four-pole switching and substantial fault-interruption capability.

Built around the established ABB SACE Tmax XT4S platform, the EPX-XT4S-TM0204 incorporates thermal-magnetic protection technology to help safeguard electrical circuits against sustained overloads and high-current short circuits. Its thermal element provides an inverse-time response to excessive current, while its magnetic element provides rapid operation during significant short-circuit faults. The TMA designation identifies the specified thermal-magnetic protection arrangement.

The four-pole (4P) configuration supports coordinated switching of three phase conductors and a neutral conductor where required by the electrical installation design. This makes the MCCB particularly suitable for appropriately designed three-phase and neutral distribution circuits in commercial buildings, industrial facilities and electrical distribution assemblies.

With its 20 A rated current, 50 kA breaking capacity and 140 mm four-pole width, the ABB EPX-XT4S-TM0204 provides a robust circuit protection solution for compatible ABB Protecta Power panelboards. The product is identified by ABB order code 1SDX255121R1, supporting accurate specification, procurement and replacement.

Key Advantages

• 20 A rated current for appropriately designed low-current electrical distribution circuits.
• Four-pole (4P) configuration supports coordinated switching of three phase conductors and a neutral conductor.
• 50 kA short-circuit breaking capacity for installations requiring substantial fault-interruption performance.
• TMA thermal-magnetic protection combines overload and short-circuit protection within one MCCB.
• Thermal overload protection helps safeguard conductors against sustained excessive current.
• Magnetic short-circuit protection provides rapid operation during significant fault conditions.
• Four-pole switching supports distribution arrangements requiring neutral disconnection.
• 140 mm four-pole width provides a defined installation footprint for compatible distribution equipment.
• ABB SACE Tmax XT4S construction combines robust mechanical design with established circuit protection technology.
• Mechanical thermal-magnetic operation provides straightforward protection without requiring an electronic trip unit.
• High breaking capacity relative to rated current supports smaller outgoing circuits supplied from higher-fault-level distribution systems.
• ABB Protecta Power compatibility supports integration into appropriately configured electrical distribution assemblies.
• ABB order code identification simplifies product specification, procurement and maintenance documentation.

Key Features

• ABB Protecta Power Devices product group.
• EPX-XT4S-TM0204 product designation.
• 20 A rated current for low-voltage circuit protection.
• Four-pole (4P) construction for three-phase and neutral electrical distribution.
• 50 kA specified short-circuit breaking capacity.
• TMA thermal-magnetic trip designation for overload and short-circuit protection.
• Thermal overload response for sustained overcurrent conditions.
• Magnetic short-circuit response for rapid operation during high-current faults.
• Inverse-time thermal characteristic helps protect conductors against excessive heating.
• Four-pole switching arrangement for circuits requiring coordinated phase and neutral disconnection.
• ABB SACE Tmax XT4S platform with S short-circuit performance classification.
• XT4 frame family for professional low-voltage circuit protection.
• 140 mm four-pole device width for installation in compatible distribution assemblies.
• Manual switching mechanism with automatic thermal-magnetic protective tripping.
• Robust moulded case construction suitable for commercial and industrial electrical distribution environments.
• Three-phase and neutral distribution applications for appropriately designed installations.
• Compatible ABB Protecta Power installation using the correct mounting and connection components.
• ABB order code 1SDX255121R1 for accurate product identification.

Reliable Four-Pole Thermal-Magnetic Protection for Electrical Distribution

The ABB EPX-XT4S-TM0204 provides dependable protection for low-voltage electrical distribution circuits where a robust four-pole MCCB is required. Its thermal-magnetic protection system responds to sustained overload conditions and high-current short-circuit faults, helping safeguard electrical conductors, connected equipment and distribution infrastructure against excessive current.

The thermal overload protection responds when current exceeds the applicable protective threshold for a sufficient period. Its inverse-time characteristic means that higher overload currents generally produce faster tripping. This helps limit excessive conductor heating while accommodating normal variations in electrical load within the circuit's design limits.

The magnetic short-circuit protection responds rapidly when fault current reaches the magnetic operating threshold. During a short circuit, high fault currents can create substantial thermal and mechanical stresses within an electrical installation. Rapid circuit interruption helps reduce the duration of these potentially damaging conditions.

The TMA thermal-magnetic configuration provides a practical alternative to electronic circuit protection where straightforward protective operation is preferred. Thermal-magnetic MCCBs combine overload and short-circuit protection within a single switching device. The exact available adjustment settings and protection characteristics should be confirmed from the ABB technical documentation for the supplied breaker.

The four-pole construction is an important feature of the EPX-XT4S-TM0204. Unlike a three-pole MCCB, a four-pole device can provide coordinated switching of the neutral conductor alongside the three phase conductors. This may be necessary for certain electrical distribution arrangements, isolation requirements and installation designs. The suitability of neutral switching must be assessed against the earthing system, applicable electrical standards and the specific circuit configuration.

It is important to distinguish between neutral switching and neutral overcurrent protection. A four-pole circuit breaker includes an additional switched pole, but the protection characteristics of that pole depend on the specific device construction. Electrical designers should verify the manufacturer's neutral pole arrangements and applicable protection characteristics before specifying the MCCB for a particular installation.

The 50 kA short-circuit breaking capacity is particularly valuable where a relatively low-current outgoing circuit is supplied from a distribution system with substantial available fault current. Although the breaker has a 20 A rated current, the prospective short-circuit current at its installation point may be significantly higher. The selected breaker must therefore have adequate fault-interruption capability at the relevant operating voltage.

The ABB SACE Tmax XT4S platform provides a robust foundation for this MCCB. Its 140 mm four-pole width supports integration into compatible electrical distribution equipment, while the XT4S construction offers established thermal-magnetic circuit protection for commercial and industrial applications.

As part of the ABB Protecta Power range, the EPX-XT4S-TM0204 is intended for installation in compatible panelboards and distribution assemblies using the correct mounting and connection components. Before commissioning, electrical designers and installers should verify the prospective fault current, operating voltage, conductor ratings, protection characteristics, neutral requirements and coordination with other protective devices.

Typical Applications

• Commercial and industrial low-voltage electrical distribution systems.
• ABB Protecta Power panelboards and compatible distribution assemblies.
• Three-phase outgoing circuits requiring four-pole switching.
• Industrial switchboards and sub-distribution panels.
• Manufacturing and production facilities.
• Commercial offices and business premises.
• Retail buildings and hospitality facilities.
• Warehouses and logistics centres.
• Building services and mechanical plant electrical distribution.
• Lower-current three-phase and neutral feeder circuits.
• Distribution circuits requiring thermal overload and magnetic short-circuit protection.
• Installations requiring a 50 kA short-circuit breaking capacity.
• Electrical distribution arrangements requiring appropriately designed neutral switching.
• Electrical infrastructure upgrades, maintenance and replacement projects.