1SDA074643R1 ABB XT1N 125 TMF 70A 3P UL/CSA MCCB

Why Choose the ABB XT1N 125 TMF 1SDA074643R1 Circuit Breaker?

The ABB XT1N 125 TMF 1SDA074643R1 is a compact three-pole moulded case circuit breaker (MCCB) designed for dependable low-voltage power distribution protection in UL/CSA applications. Part of the ABB SACE Tmax XT1 range, it combines a 125 A frame with a 70 A TMF thermomagnetic trip unit for overload and short-circuit protection.

This XT1N circuit breaker is supplied in a fixed configuration with front terminals. Its TMF thermomagnetic release has a rated current of 70 A and an instantaneous short-circuit current setting of 800 A, providing straightforward protection for feeders, distribution circuits, machinery and other electrical loads without requiring an electronic trip unit.

Designed to UL 489 requirements, the 1SDA074643R1 provides an interrupting rating of 50 kA at 240 V AC, 25 kA at 480 V AC and 18 kA at 600Y/347 V AC. Its compact construction, front bolt terminals and established Tmax XT platform make it suitable for industrial, commercial and OEM electrical distribution systems.

Key Advantages

• Compact ABB SACE Tmax XT1N moulded case circuit breaker.
• 70 A TMF thermomagnetic trip unit for overload and short-circuit protection.
• 25 kA interrupting rating at 480 V AC according to UL 489.
• Three-pole configuration for three-phase electrical distribution circuits.
• Instantaneous magnetic short-circuit setting of 800 A.
• Fixed mounting with front bolt terminals for straightforward panel and switchboard integration.

Key Features

• ABB SACE Tmax XT1N 125 moulded case circuit breaker.
• 70 A rated current (In).
• 125 A rated uninterrupted current (Iu) for the XT1 frame.
• Three-pole configuration.
• TMF thermomagnetic release.
• Thermal overload and instantaneous magnetic short-circuit protection.
• 800 A rated instantaneous short-circuit current setting.
• N short-circuit performance level.
• 50 kA interrupting rating at 240 V AC.
• 25 kA interrupting rating at 480 V AC.
• 18 kA interrupting rating at 600Y/347 V AC.
• Rated operational voltage of 600Y/347 V AC.
• Suitable for specified AC and DC applications.
• Fixed construction with front bolt terminals.
• UL 489 certified configuration.

UL/CSA Thermomagnetic Circuit Protection

The TMF trip unit combines thermal overload protection with instantaneous magnetic short-circuit protection in a compact mechanical release. The thermal element responds to sustained overcurrent conditions, while the magnetic element provides rapid tripping during severe short-circuit faults. On the 1SDA074643R1, the instantaneous short-circuit current setting is 800 A.

For North American power distribution applications, the XT1N provides documented UL 489 interrupting ratings across several system voltages, including 50 kA at 240 V AC, 25 kA at 480 V AC and 18 kA at 600Y/347 V AC. This performance, combined with its compact three-pole fixed construction, makes the breaker suitable for switchboards, machinery, distribution panels and OEM equipment.

Typical Applications

• Industrial low-voltage power distribution systems.
• Commercial electrical distribution panels.
• Three-phase feeder and branch circuit protection.
• Industrial machinery and equipment supplies.
• UL/CSA switchboards and control panels.
• OEM electrical equipment and panel-building applications.