ABB / Thomas & Betts JS360125A Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
ABB / Thomas & Betts JS360125A - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating as a core component in power systems, the ABB JS360125A is a 125A, 3-pole molded case circuit breaker. It handles demanding electrical loads across 480VAC and 600VAC networks while maintaining strict safety standards. Designed with a standard unit mount configuration, this J-Frame breaker fits seamlessly into Thomas & Betts and Eaton Series C panelboards. The device utilizes a thermal-magnetic trip mechanism, delivering a 35 kAIC capacity at 480V and an HACR rating for motor loads.Specifications
| Brand | ABB / Thomas & Betts |
|---|---|
| Part Number | JS360125A |
| Series | JS |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 35kA @ 480VAC, 14kA @ 600VAC |
| Frame Type | J |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Thomas & Betts Panels |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Side Lugs Included |
| Standards | CSA C22.2 No. 5.1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards are compatible with the JS360125A circuit breaker?
This J-frame breaker is designed for use in Thomas & Betts panels and is also compatible with Eaton Series C panelboards.
Can this breaker replace an Eaton Series C J-frame breaker?
Yes, Thomas & Betts JS frame breakers are physically and electrically interchangeable with Eaton Series C J-frame breakers of the same specifications.
What type of conductors can be used with the JS360125A lugs?
The factory-installed lugs are rated for both aluminum and copper conductors, accepting wire sizes from 4 AWG up to 350 kcmil.
How is the JS360125A secured inside the panelboard?
It features a unit mount, feed-thru design. This means it bolts directly to the panel chassis or backpan rather than snapping onto busbars, making it suitable for main or sub-feed applications.
What does the adjustable magnetic trip function allow on this breaker?
The adjustable magnetic trip allows you to tune the instantaneous short-circuit response. This is useful for preventing nuisance tripping caused by high inrush currents from motors or transformers.
Is the thermal trip setting adjustable on the JS360125A?
No, the thermal protection for long-time overload conditions is fixed at 125 amps. Only the instantaneous magnetic trip is adjustable.
How does operating voltage affect the interrupting rating of this breaker?
While the breaker provides 35kAIC of protection at 480VAC, its interrupting capacity drops to 14kAIC when used on a 600VAC system. You must verify that your system's available fault current does not exceed the rating for your specific operating voltage.
What happens if the breaker is exposed to a fault current higher than 35kA at 480V?
The breaker has a maximum interrupting capacity of 35kAIC at 480VAC. Applying it in a system with a higher available fault current violates safety standards and can result in catastrophic equipment failure.
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