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ABB XT4HU3125AYJ000XXX Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
ABB
XT4HU3125AYJ000XXX
Molded Case Circuit Breaker
Brand
ABB
SKU
XT4HU3125AYJ000XXX
Quantity
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ABB XT4HU3125AYJ000XXX - 125A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding environments, this 125A MCCB delivers thermal-magnetic circuit protection with a fixed LI trip function. Designed for modern infrastructure, the three-pole breaker mounts into ABB ReliaGear neXT panelboards and switchboards. It is an ideal replacement for the discontinued T4H125TW model. With a 150kAIC interrupting capacity at 240V, this current-limiting device features reverse feed capabilities, double insulation, and positive operation for enhanced safety.Specifications
| Brand | ABB |
|---|---|
| Series | XT4 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 150kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC, 65kA @ 600VDC |
| Frame Type | XT4H |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB ReliaGear neXT Panelboards, Switchboards |
| Wire Gauge | 4 AWG - 300 kcmil |
| 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, Motor Operator, Padlock Attachment, Terminal Shields, Handle Lock |
|---|---|
| Accessories | Lugs Not Included |
| 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, Current Limiting, Reverse Feed, Double Insulation, Positive Operation |
Product FAQs
6 answersWhat equipment is the XT4HU3125AYJ000XXX breaker compatible with?
This XT4 breaker is commonly integrated into ABB ReliaGear neXT panelboards and switchboards. Because this specific catalog number is a unit mount configuration, inserting it into a ReliaGear panel requires the appropriate modular mounting bracket and hardware assembly.
Are the thermal and magnetic trip thresholds adjustable on this model?
No, this breaker features a basic thermal-magnetic trip unit with fixed long-time (thermal) and fixed instantaneous (magnetic) trip settings. If your application requires field-adjustable coordination, you will need an XT4 model equipped with a TMA or Ekip electronic trip unit.
How does the short-circuit interrupting rating change based on system voltage?
The nominal 65kA rating applies specifically to 480VAC and 600VDC systems. The interrupting capacity increases to 150kA for 240VAC applications and drops to 25kA for 600VAC distribution systems.
What are the wire size limits for the standard lugs on this breaker?
The factory-installed lugs accept conductor sizes ranging from 4 AWG to 300 kcmil. Installers must refer to the breaker faceplate for precise torque requirements based on the exact wire gauge and material being terminated.
Is this ABB XT4 circuit breaker rated for direct current (DC) applications?
Yes, it is UL rated for DC systems, providing a 50kA interrupting capacity at 250VDC and 65kA at 600VDC. When installing in DC applications, you must verify the proper pole series wiring configuration as dictated by ABB installation guidelines for your specific DC voltage.
Can this XT4H breaker be utilized in a series-rated system?
Yes, the Tmax XT family is fully tested for series-rated combinations. This allows you to achieve a higher overall short-circuit current rating (SCCR) when paired with specific downstream ABB breakers. You must consult ABB series rating tables to verify compliance for your exact protective device combination.
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