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ABB XT4NU3250AYL000XXX Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
ABB
XT4NU3250AYL000XXX
Molded Case Circuit Breaker
Brand
ABB
SKU
XT4NU3250AYL000XXX
Quantity
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ABB XT4NU3250AYL000XXX - 250A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial power distribution, the ABB XT4NU3250AYL000XXX is a 3-pole, 250A molded case circuit breaker. It delivers a normal interrupting capacity of 65kA at 240V with fixed thermal-magnetic trip settings. This unit mount MCCB installs into ABB ReliaGear neXT panelboards and SB switchboards. It also replaces legacy T4N250TW breakers. Built within the robust XT4 frame, this device is HACR rated and supports reverse feed applications for versatile integration.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 |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Front Terminals Included, Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CCC, CE, CSA, cULus, IEC, KEMA, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
8 answersWhat panelboards are compatible with the XT4NU3250AYL000XXX?
This molded case circuit breaker is specifically designed for use in ABB ReliaGear neXT panelboards and ReliaGear SB switchboards.
What wire sizes are accepted by the terminal lugs on this XT4 breaker?
The factory-installed lugs on this unit accept 3/0 AWG to 350 kcmil copper or aluminum (Cu/Al) conductors.
What does the N in the XT4N frame designation mean?
The N indicates the Normal interrupting capacity tier within the ABB SACE Tmax XT family. For this model, it provides a maximum interrupting rating of 65kA at 240VAC and 25kA at 480VAC.
Can the XT4NU3250AYL000XXX be used in direct current (DC) systems?
Yes, this breaker is rated for DC applications. It provides a 35kA interrupting capacity at both 250VDC and 600VDC.
What type of trip unit does the XT4NU3250AYL000XXX utilize?
This breaker utilizes a thermal magnetic trip unit with fixed Long-Time (L) and fixed Instantaneous (I) protection settings.
How is this Tmax XT4 breaker mounted?
It features a unit mount configuration, meaning it is designed to be bolted securely into the enclosure or backpan rather than using a drawout or plug-in base.
Are internal accessories supported on this frame?
Yes, the ABB SACE Tmax XT4 frame supports a variety of field-installable electrical accessories, including auxiliary contacts, shunt trips, and undervoltage releases.
What safety precautions are required before installing this breaker?
Ensure all upstream power is completely disconnected and locked out. Verify the absence of voltage with a properly rated meter. Installation should only be performed by a qualified electrician following NFPA 70E guidelines.
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