ABB XT4NU3175AY8000XXX Molded Case Circuit Breaker
- 175A
- 3 Pole
- Unit Mount
ABB
XT4NU3175AY8000XXX
Molded Case Circuit Breaker
Brand
ABB
SKU
XT4NU3175AY8000XXX
Quantity
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ABB XT4NU3175AY8000XXX - 175A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial environments, this 175-amp molded case circuit breaker features oversized lugs to accept up to 350 kcmil conductors. The unit integrates smoothly with ABB ReliaGear neXT panelboards and can replace older Tmax T4N200TW models when paired with the appropriate retrofit kit. Delivering a normal 25kA interrupting capacity at 480V, it utilizes fixed thermal-magnetic technology to provide dependable long-time and instantaneous fault defense.Specifications
| Brand | ABB |
|---|---|
| Series | XT4 |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600Y/347VAC, 250VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600Y/347VAC, 35kA @ 250VDC, 35kA @ 600VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | ABB ReliaGear neXT Panelboards, ABB ReliaGear SB Switchboards |
| Wire Gauge | 3/0 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Shunt Trip, Undervoltage Release, Padlock Attachment, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CCC, CSA, cULus, IEC, KEMA, RINA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
8 answersWhich panelboards are compatible with the XT4NU3175AY8000XXX circuit breaker?
This 3-pole breaker is designed for installation in ABB ReliaGear neXT Panelboards and ABB ReliaGear SB Switchboards. It utilizes the SACE Tmax XT frame design for seamless integration into these distribution systems.
What wire sizes and materials are supported by the factory lugs on this XT4 breaker?
The factory-installed lugs accept 3/0 AWG to 350 kcmil conductors. They are rated for both copper (Cu) and aluminum (Al) wiring. Ensure proper torque specifications are followed during installation as outlined in the Tmax XT documentation.
What does the LI trip function indicate on this Tmax XT4 breaker?
The LI designation means this thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. Both the thermal overload and magnetic short-circuit trip thresholds are fixed on this specific 175A model.
How does the interrupting capacity scale across different voltages for this N-tier breaker?
This XT4N breaker provides a maximum interrupting rating of 65kA at 240V AC. The rating steps down to 25kA at 480V AC and 18kA at 600V AC or 347V AC. It also carries a 35kA DC interrupting rating at both 250V DC and 600V DC.
Can this breaker be DIN rail mounted?
No, this specific configuration is a unit mount breaker designed for bolt-on installation in compatible ReliaGear enclosures or standard backpans. It is not configured for direct DIN rail mounting without specialized adapters.
What is the primary application for the fixed thermal-magnetic trip unit?
Fixed thermal-magnetic trip units are typically used for general-purpose power distribution where adjustable trip curves are not required. They provide reliable, tamper-proof protection for standard commercial and industrial feeder circuits.
What does the N in the catalog number XT4NU3175AY8000XXX signify?
The N designates the breaker interrupting capacity tier within the ABB SACE Tmax XT family. For the XT4 frame, the N-tier provides a normal interrupting rating of 25kA at 480V AC and 65kA at 240V AC.
Is this 175A breaker rated for direct current (DC) applications?
Yes, in addition to its AC ratings, this breaker is rated for DC applications. It provides a 35kA interrupting capacity at both 250V DC and 600V DC.
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