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ABB XT4NU3125AYJ000XXX Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
ABB
XT4NU3125AYJ000XXX
Molded Case Circuit Breaker
Brand
ABB
SKU
XT4NU3125AYJ000XXX
Quantity
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ABB XT4NU3125AYJ000XXX - 125A 3 Pole Molded Case Circuit Breaker
New
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Description
Built for commercial power systems, the ABB XT4NU3125AYJ000XXX is a 3-pole, 125A molded case circuit breaker. It utilizes fixed thermal and magnetic trip elements to deliver precise long-time and instantaneous (LI) protection. This unit mount MCCB is designed for ABB ReliaGear neXT panelboards and SB switchboards. It replaces legacy Tmax T4N125TW breakers when paired with a retrofit kit. The HACR-rated breaker features reverse feed capabilities and a 25kAIC rating at 480VAC.Specifications
| Brand | ABB |
|---|---|
| Series | XT4 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 35kA @ 250VDC, 35kA @ 600VDC |
| Frame Type | XT4N |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB ReliaGear neXT Panelboards, ABB ReliaGear SB Switchboards |
| Wire Gauge | 4 AWG - 300 kcmil (Cu/Al) |
| Max Wire | 300 kcmil |
| Min Wire | 4 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 |
|---|---|
| Accessories | Lugs 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 answersWhich panelboards and switchboards are compatible with the XT4NU3125AYJ000XXX breaker?
This unit mount breaker is designed for use with ABB ReliaGear neXT panelboards and ReliaGear SB switchboards.
Can I use this XT4N breaker to replace an older Tmax T4N model?
Yes, this XT4 breaker can replace legacy Tmax T4N125TW circuit breakers when paired with the appropriate retrofit kit.
What wire sizes do the factory lugs on this 125A breaker accept?
The standard lugs accommodate copper or aluminum conductors ranging from 4 AWG to 300 kcmil.
What is the ambient operating temperature range for this Tmax XT breaker?
It is rated for operation in ambient air temperatures between -25 degrees Celsius and +70 degrees Celsius, with the trip unit reference temperature set at +40 degrees Celsius.
Is the 3-pole XT4NU3125AYJ000XXX suitable for single-phase applications?
Yes, XT4 three-pole circuit breakers equipped with thermal magnetic trip units are UL listed for single-phase applications up to 600VAC.
Does this ABB circuit breaker support reverse feeding?
Yes, it features reverse feed capabilities, meaning line power can be supplied to either the top or bottom terminals.
How does the TMF trip unit on this breaker function?
The TMF trip unit provides fixed thermal and fixed magnetic elements to deliver reliable long time and instantaneous (LI) overcurrent protection.
Does the XT4 series feature double insulation?
Yes, the breaker features double insulation between the live power parts and the front of the apparatus, preventing any risk of operator contact with internal live components.
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