ABB / Trumbull AT37125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Quantity
ABB / Trumbull AT37125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Essential for three-phase commercial applications, this 125-amp molded case breaker offers reliable thermal-magnetic protection for legacy electrical systems. It ensures continuous operation for facilities utilizing older distribution equipment. Designed to mount into Trumbull and GE A-Series panelboards, it provides a precise fit. Facility engineers can use this unit to replace obsolete TFK236125 or TQD32125 breakers without modifying the enclosure.Specifications
| Brand | ABB / Trumbull |
|---|---|
| Part Number | AT37125-R |
| Series | Type AT |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 14kA @ 480VAC, 10kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Trumbull / GE Legacy Panelboards, GE A-Series Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| 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 |
| Accessories | Lugs Not Included |
|---|---|
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
Product FAQs
5 answersWhich panelboards accept the Trumbull AT37125 circuit breaker?
This AT frame breaker is compatible with Trumbull and GE legacy panelboards, as well as GE A-Series panelboards. It requires a bolt-on connection directly to the panel bus.
What are the conductor requirements for the AT37125 lugs?
The factory-installed lugs accommodate 4 AWG to 300 kcmil conductors and are rated for both aluminum and copper wire. Ensure proper torque is applied during termination to prevent thermal issues.
Is the trip unit on the AT37125 field adjustable?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous (LI) trip functions are factory set and cannot be adjusted in the field.
Is this breaker suitable for direct current (DC) systems?
Yes, the AT37125 is rated for use in DC systems up to 250VDC, making it suitable for specific industrial control or battery applications requiring a 3-pole configuration.
What safety considerations apply when installing this bolt-on breaker?
Always ensure the panelboard is fully de-energized before bolting the breaker to the bus. Additionally, verify that the available fault current at the installation point does not exceed the breaker's maximum interrupting capacity of 25kA at 240VAC or 14kA at 480VAC.
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