1SDX255155R1 ABB EPX-XT4S-E1-0634 63A 4-Pole 50kA Electronic LS/I MCCB

Why Choose the ABB EPX-XT4S-E1-0634 63A 4-Pole MCCB?

The ABB EPX-XT4S-E1-0634 is a high-performance 63 A four-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in commercial and industrial electrical distribution systems. Featuring a 50 kA short-circuit breaking capacity and an ABB Ekip DIP LS/I electronic trip unit, this circuit breaker delivers flexible protection for low-voltage power distribution applications. It forms part of the ABB Protecta Power Devices range and uses the established ABB SACE Tmax XT4S160 platform.

Unlike conventional thermal-magnetic circuit breakers, the EPX-XT4S-E1-0634 incorporates an electronic protection release that enables configurable overload and short-circuit protection characteristics. Its LS/I functionality provides long-time overload protection (L) with a choice between short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I). This flexibility helps electrical designers coordinate protective devices and select suitable tripping characteristics for the installation.

With a 63 A rated current, four-pole (4P) configuration and 50 kA breaking capacity, the ABB EPX-XT4S-E1-0634 is particularly suitable for outgoing circuits, commercial distribution boards and industrial electrical installations requiring electronic circuit protection. Its compact 140 mm four-pole width supports efficient integration into compatible ABB Protecta Power assemblies. The product is identified by ABB order code 1SDX255155R1.

Key Advantages

• 63 A rated current for dependable protection of appropriately designed low-voltage electrical circuits.
• 50 kA short-circuit breaking capacity provides substantial fault-interruption capability.
• Four-pole configuration enables simultaneous switching of three phase conductors and neutral.
• Electronic Ekip LS/I protection provides greater flexibility than conventional thermal-magnetic trip technology.
• Long-time overload protection (L) helps protect cables and equipment against sustained overcurrent conditions.
• Selectable short-time delayed protection (S) can assist with protective device discrimination.
• Selectable instantaneous protection (I) provides rapid operation during high-current short-circuit faults.
• Based on the established ABB SACE Tmax XT4S160 circuit breaker platform.
• Compact 140 mm four-pole width supports space-efficient distribution board installation.
• Designed for integration into compatible ABB Protecta Power distribution equipment.
• Electronic protection settings support appropriately designed circuit protection and coordination strategies.

Key Features

• ABB Protecta Power Devices product group.
• ABB SACE Tmax XT4S160 moulded case circuit breaker platform.
• 63 A rated current for low-voltage electrical distribution circuits.
• 50 kA short-circuit breaking capacity.
• Four-pole (4P) construction for three-phase and neutral switching.
• ABB Ekip DIP LS/I electronic trip unit.
• Long-time (L) protection against sustained overload conditions.
• Short-time delayed (S) protection available as a selectable short-circuit protection characteristic.
• Instantaneous (I) protection available as an alternative short-circuit protection characteristic.
• Electronic trip technology enables configurable protective characteristics.
• 160 A frame class with a 63 A electronic trip rating.
• 140 mm four-pole width for efficient panel integration.
• Fixed-mounted construction with front electrical terminals.
• Manual operating mechanism with automatic protective tripping.
• Suitable for compatible ABB Protecta Power electrical distribution assemblies.
• ABB manufacturer order code: 1SDX255155R1.

Advanced Electronic LS/I Protection for Electrical Distribution

The ABB EPX-XT4S-E1-0634 uses an electronic trip unit to monitor electrical current and initiate protective tripping when an overload or short-circuit condition exceeds the configured thresholds. Electronic protection offers flexibility in circuit breaker settings and is particularly valuable where electrical distribution systems require careful coordination between upstream and downstream protective devices.

The long-time (L) protection function responds to sustained overload conditions that may cause excessive heating in electrical cables and connected equipment. By monitoring current over time, the electronic trip unit can disconnect a circuit when its configured overload protection characteristic is exceeded. The long-time settings should be selected according to cable capacity, connected load and installation conditions.

The short-time delayed (S) protection function provides short-circuit protection with an intentional delay. When correctly coordinated with downstream protective devices, this delay can help improve selectivity by allowing the protective device nearest a fault to operate before an upstream breaker disconnects a larger section of the electrical installation.

The alternative instantaneous (I) protection function provides rapid tripping when a sufficiently high short-circuit current is detected. This helps limit the duration of severe faults and reduce the potential impact on electrical distribution equipment. With an LS/I electronic release, the short-time delayed and instantaneous protection characteristics are selectable alternatives, rather than three simultaneously available L, S and I functions.

The four-pole configuration enables simultaneous switching of three phase conductors and the neutral conductor. This makes the EPX-XT4S-E1-0634 suitable for appropriately designed three-phase distribution systems where four-pole switching or isolation is required. The specific neutral protection arrangement and applicable settings should be verified against the manufacturer's documentation and installation requirements.

The ABB SACE Tmax XT4S160 platform combines compact construction with electronic protection functionality. With a 63 A rated current and 50 kA short-circuit breaking capacity, the EPX-XT4S-E1-0634 is suitable for distribution circuits requiring moderate continuous current capacity and substantial fault-interruption capability. Correct selection must account for operating voltage, prospective short-circuit current, cable ratings and coordination with other protective devices.

Typical Applications

• ABB Protecta Power distribution board installations.
• Commercial building electrical distribution systems.
• Three-phase and neutral outgoing circuit protection.
• Industrial low-voltage distribution panels.
• Low-voltage switchgear and power distribution assemblies.
• Commercial offices, retail premises and warehouse installations.
• Building services and mechanical equipment distribution circuits.
• Manufacturing facilities and industrial electrical infrastructure.
• Electrical sub-distribution circuits requiring electronic overload protection.
• Installations requiring selectable delayed or instantaneous short-circuit protection.
• Electrical systems where protective device discrimination is an important design consideration.
• Distribution circuits with high prospective fault levels relative to their normal operating current.
• Electrical distribution board upgrades where compatibility has been verified.