ABB XT4NU3250AFF000XXX Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
ABB
XT4NU3250AFF000XXX
Molded Case Circuit Breaker
Brand
ABB
SKU
XT4NU3250AFF000XXX
Quantity
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ABB XT4NU3250AFF000XXX - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial environments, the XT4NU3250AFF000XXX provides 250A, 3-pole molded case circuit protection within the ABB SACE Tmax XT4 frame series. It utilizes a fixed thermal and fixed magnetic trip unit to deliver consistent, tamper-proof overcurrent protection. Designed to integrate seamlessly with ABB ReliaGear neXT panelboards and ReliaGear SB switchboards, it offers a 65kAIC interrupt rating at 240VAC. This model replaces the legacy T4N250TW circuit breaker.Specifications
| Brand | ABB |
|---|---|
| Series | XT4 |
| Amperage | 250A |
| 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 |
| Frame Type | XT4N |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB ReliaGear neXT Panelboards, ReliaGear SB Switchboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Motor Operator |
|---|---|
| Accessories | None (Standard) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CCC, CSA, cULus, IEC, KEMA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed, Double Insulation |
Product FAQs
8 answersWhich panelboards are compatible with the XT4NU3250AFF000XXX circuit breaker?
This unit-mount breaker is designed to integrate seamlessly with ABB ReliaGear neXT panelboards and ReliaGear SB switchboards.
What legacy ABB or GE circuit breaker does the XT4NU3250AFF000XXX replace?
The XT4NU3250AFF000XXX serves as a direct replacement for the legacy General Electric and ABB Tmax T4N250TW molded case circuit breakers.
What does the N in the XT4NU3250AFF000XXX part number indicate?
The N designates a Normal interrupting capacity tier for the XT4 frame, providing a maximum interrupting rating of 65kA at 240VAC, 25kA at 480VAC, and 18kA at 600VAC.
Can the trip unit on the XT4NU3250AFF000XXX be adjusted for different amperage thresholds?
No, this breaker is equipped with a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous protection thresholds are factory-set and cannot be adjusted in the field.
Is the XT4NU3250AFF000XXX suitable for reverse feeding?
Yes, this breaker supports reverse feed applications. Power can be safely supplied to either the top or bottom terminals up to a maximum of 600VAC.
Can this 3-pole XT4 breaker be used in single-phase applications?
Yes, ABB XT4 three-pole circuit breakers equipped with thermal-magnetic trip units are UL-listed for single-phase applications up to 600VAC.
Is the XT4NU3250AFF000XXX 100 percent rated for continuous operation?
Yes, this fixed XT4 breaker is suitable for continuous operation at 100 percent of its 250A rating when installed with 90 degrees Celsius insulation wire that is sized based on 75 degrees Celsius ampacity guidelines.
What is the maximum amperage capacity of the ABB Tmax XT4 frame?
The SACE Tmax XT4 frame supports a maximum capacity of 250 amps. This specific XT4NU3250AFF000XXX model is configured for the full 250A rating.
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