Overview
The ABB T1N040TLA is a 40-ampere, three-pole molded case circuit breaker from the Tmax T1 family, engineered for North American industrial applications. Operating at 480VAC, this UL489/CSA C22.2 listed breaker delivers dependable thermal-magnetic protection in a compact frame. The T1 series is specifically designed for feeders, branch circuits, and motor starter applications requiring robust overcurrent detection and fast fault clearing.
Key Features
- Rated for 40A continuous current at 480VAC, three-pole configuration
- Electromagnetic relay technology with non-interchangeable trip units ensures precise overcurrent detection
- Dual protection: heat-sensitive bimetal for thermal overload, precision magnetic coil for short-circuit protection
- State-of-the-art arcing chamber design limits fault currents and extends contact life
- Suitable for reverse-feed applications and standard DIN rail mounting
- UL File #E93565, CSA C22.2 certified for global acceptance
Technical Specifications
Electrical Ratings:
- Rated Voltage: 480 VAC
- Rated Current: 40 A
- Poles: 3 (three-pole)
- Trip Unit Type: Thermal-Magnetic
- Frame Size: T1
Performance:
- Thermal Element: Heat-sensitive bimetal strip
- Magnetic Element: Precision electromagnetic coil
- Interrupting Capacity: Varies by version designation (Standard to Extra-High available)
- Operating Temperature Range: -20°C to +60°C
Certifications & Standards:
- UL 489 listed
- CSA C22.2 No. 5 certified
- IEC 60947-2 rated (UL/CSA version)
Typical Applications
The T1N040TLA is commonly deployed in:
- Industrial motor circuits and variable frequency drive (VFD) feeders
- Process control panel distribution and branch circuit protection
- Manufacturing facility main feeder protection (480V three-phase)
- Heavy-equipment and machinery control circuits
- Reverse-feed applications in distributed power systems
Compatibility & Replacements
This breaker is part of ABB’s Tmax T1 family and is fixed-frame design (non-interchangeable trip units). It is compatible with standard industrial control enclosures and DIN rail mounting systems. Common replacements within the Tmax line for different amperage ratings (15A–100A) use the same physical footprint and mounting interfaces. When specifying accessories such as shunt releases or undervoltage releases, confirm compatibility with the T1 frame and verify 480V coil ratings.
