ABB A2N125TW-2 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Unit Mount
Quantity
ABB A2N125TW-2 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for demanding environments, the A2N125TW-2 is a 2-pole, 125A MCCB from ABB's Formula A2 family. It features a fixed thermal-magnetic trip mechanism, ensuring precise long-time and instantaneous (LI) protection for single-phase circuits. This unit-mount MCCB integrates into ABB ReliaGear RQ and Formula panelboards. It acts as a cross-reference for obsolete GE THQD22125 breakers, with retrofits potentially needed for older enclosures. This RoHS-compliant breaker is rated 25kAIC at 240VAC.Specifications
| Brand | ABB |
|---|---|
| Series | Formula |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 25kA @ 240VAC, 25kA @ 250VDC |
| Frame Type | A2A |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB ReliaGear RQ Panelboards, ABB Formula Panelboards, DIN Rail Enclosures |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Padlock Attachment, Rotary Handle, Lug Kits |
|---|---|
| Accessories | None included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL, cULus |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed, RoHS Compliant, 50C Ambient Calibration |
Product FAQs
9 answersWhich panelboards are compatible with the ABB A2N125TW-2 circuit breaker?
This 2-pole breaker is designed for use in ABB ReliaGear RQ lighting panelboards, ABB Formula panelboards, and standard DIN rail enclosures.
Can the A2N125TW-2 replace older General Electric circuit breakers?
Yes, this ABB Formula A2A frame breaker serves as a cross-reference replacement for obsolete GE THQD22125 breakers. Retrofit kits or mounting modifications may be required when installing it in older GE enclosures.
Can the trip thresholds on the A2N125TW-2 be adjusted in the field?
No, this breaker is equipped with a TMF (fixed thermal-magnetic) trip unit. The long-time overload and instantaneous short-circuit protection thresholds are factory-calibrated for 125 amps and cannot be adjusted.
Does the A2N125TW-2 plug onto the busbar or bolt on?
This is a unit-mount (bolt-on) circuit breaker. It does not plug in; it must be bolted directly to the panelboard chassis, mounting plate, or DIN rail enclosure using the appropriate mounting hardware.
Is the A2N125TW-2 rated for direct current (DC) applications?
Yes, in addition to standard 240V AC systems, this thermal-magnetic breaker is fully rated for 250V DC applications with a 25kA interrupting capacity, making it suitable for specific industrial control or solar applications.
Are the terminal lugs included with the A2N125TW-2?
The breaker is configured for front terminal lug connections, but specific mechanical CuAl lug kits must often be specified and ordered separately based on your conductor size and panel configuration.
Can this breaker be used as a main breaker or a sub-feed?
Yes, within ABB ReliaGear RQ and Formula panelboards, the A2A frame can be utilized as either a main breaker or a sub-feed breaker depending on the panel configuration.
What hardware is needed to install this 2-pole breaker as a sub-feed in ReliaGear panels?
Installing a 2-pole A2A frame breaker as a sub-feed in 400A or 600A ABB ReliaGear panelboards requires the MBA12 breaker installation kit, which includes the necessary mounting bracket, Z-strap, and shield inserts.
What safety standards does the A2N125TW-2 meet for commercial installations?
This Formula series breaker is UL 489 listed and CSA certified for use in low-voltage power distribution systems, ensuring compliance with strict commercial and industrial safety requirements.
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