1SDX254931R1 ABB EPX-XT2S-TM0203 20A 3P 50kA MCCB TMA Thermal-Magnetic

Why Choose the ABB EPX-XT2S-TM0203 Protecta Power Circuit Breaker?

The ABB EPX-XT2S-TM0203 is a reliable 20 A three-pole moulded case circuit breaker (MCCB) designed to provide effective overload and short-circuit protection in commercial and industrial low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker uses the ABB SACE Tmax XT2S160 platform with a thermal-magnetic (TMA) trip unit, providing dependable circuit protection without requiring an electronic trip unit or auxiliary power supply for its protective operation.

Featuring a 50 kA short-circuit breaking capacity, the EPX-XT2S-TM0203 is designed for installations requiring a higher fault-interruption capability than standard 36 kA MCCB configurations. Its thermal-magnetic protection combines thermal overload protection with magnetic short-circuit protection, helping safeguard electrical conductors, distribution equipment and connected loads against potentially damaging fault conditions.

With a 20 A rated current, three-pole configuration and compact 100 mm nominal width, this MCCB is suitable for three-phase electrical circuits where all three phase conductors require coordinated switching and protection. Its established ABB Tmax XT2S construction makes it a practical choice for electrical contractors, panel builders and maintenance engineers working with ABB Protecta Power distribution boards and commercial switchboards.

Key Advantages

• 20 A rated current provides protection for appropriately designed low-voltage electrical distribution circuits.
• Three-pole (3P) configuration enables coordinated switching and protection of three phase conductors.
• 50 kA short-circuit breaking capacity provides enhanced fault-interruption capability for installations with higher prospective fault currents.
• TMA thermal-magnetic trip unit combines thermal overload protection with magnetic short-circuit protection.
• Thermal overload protection responds to sustained excessive current and helps prevent conductor overheating.
• Magnetic short-circuit protection provides rapid tripping in response to significant fault currents.
• Adjustable protection characteristics support suitable circuit protection settings within the trip unit's available adjustment range.
• ABB SACE Tmax XT2S160 platform combines compact construction with established thermal-magnetic protection technology.
• 100 mm nominal width helps optimise available installation space within compatible distribution assemblies.
• Self-contained thermal-magnetic protection operates without a separate electronic trip-unit power supply.
• Suitable for commercial and industrial three-phase electrical distribution applications.
• Designed for integration into compatible ABB Protecta Power electrical distribution assemblies.

Key Features

• ABB Protecta Power Devices product family.
• EPX-XT2S-TM0203 model designation.
• ABB SACE Tmax XT2S moulded case circuit breaker platform.
• 20 A rated current.
• XT2S160 frame with a maximum frame rating of 160 A.
• Three-pole (3P) circuit breaker construction.
• 50 kA short-circuit breaking capacity.
• TMA thermal-magnetic trip unit.
• Thermal protection: Overload protection using a temperature-responsive tripping mechanism.
• Magnetic protection: Short-circuit protection using an electromagnetic tripping mechanism.
• Adjustable thermal-magnetic protection characteristics within the trip unit's specified operating range.
• Three-pole switching capability for compatible three-phase electrical distribution circuits.
• Manual operating mechanism for circuit switching and resetting.
• 100 mm nominal width for the three-pole XT2 configuration.
• Compact moulded case construction for installation within compatible electrical assemblies.
• Suitable for low-voltage AC electrical distribution applications.
• Compatible with appropriately selected ABB Tmax XT2 mounting, connection and operating accessories.
• Designed for use with suitable protective covers and terminal connection arrangements.
• Suitable for outgoing feeder protection in commercial and industrial switchboards.
• Provides an alternative to electronic-trip MCCBs where thermal-magnetic protection meets the installation requirements.

Reliable TMA Thermal-Magnetic Protection for Three-Phase Distribution

The ABB EPX-XT2S-TM0203 incorporates a TMA thermal-magnetic trip unit designed to protect electrical installations against sustained overloads and short-circuit faults. Thermal-magnetic protection uses established electromechanical operating principles, providing dependable protective operation without the need for a separate electronic trip-unit power supply.

The thermal protection element responds to excessive current sustained over time. As current increases beyond the permitted operating conditions, the thermal mechanism develops the response required to trip the circuit breaker. This inverse-time behaviour helps protect cables and connected electrical equipment against overheating caused by prolonged overloads.

The magnetic protection element responds to high fault currents associated with short circuits. When the magnetic operating threshold is reached, the circuit breaker trips rapidly to interrupt the fault. The TMA arrangement provides adjustable protection characteristics, allowing settings to be selected within the available adjustment range for the installation.

The 50 kA short-circuit breaking capacity makes the XT2S performance level particularly relevant where a higher fault-interruption rating is required. Electrical designers must confirm the applicable breaking capacity at the system operating voltage and verify that the selected device is suitable for the prospective short-circuit current at its installation point.

The three-pole configuration allows coordinated switching and protection of the three phase conductors in a three-phase circuit. Unlike a four-pole MCCB, this configuration does not provide a fourth switched pole for the neutral conductor. Selection must therefore take account of the installation's neutral arrangements, earthing system and applicable electrical standards.

When installing the EPX-XT2S-TM0203 within an ABB Protecta Power distribution board, appropriate mounting components, terminal connections and protective covers must be selected. Electrical designers should verify conductor ratings, prospective fault current, thermal-magnetic trip settings and protective device coordination before commissioning.

Typical Applications

• ABB Protecta Power electrical distribution boards.
• Commercial low-voltage electrical distribution systems.
• Industrial electrical switchboards and distribution panels.
• 20 A three-pole outgoing feeder protection.
• Three-phase electrical distribution circuits.
• Building services and mechanical plant distribution.
• Commercial premises and office building electrical infrastructure.
• Manufacturing and industrial facility electrical installations.
• Commercial switchboards and sub-distribution assemblies.
• Electrical panel building and switchboard manufacturing.
• Distribution circuits requiring thermal-magnetic overload and short-circuit protection.
• Electrical installations where a 50 kA breaking capacity is required and suitable for the operating voltage.