ABB / Thomas & Betts KS360250A Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Quantity
ABB / Thomas & Betts KS360250A - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for heavy-duty industrial applications, the ABB KS360250A is a 3-pole, 250A bolt-on circuit breaker delivering dependable LI protection. This K-frame MCCB mounts into Westinghouse and Eaton panelboards, switchboards, and motor control centers. It serves as an exact substitute for the KD3250, making it ideal for maintaining older infrastructure. Operating at up to 600VAC or 250VDC, it features a 30kAIC rating at 480V, an adjustable magnetic trip, and accepts #3 AWG to 350 kcmil wire.Specifications
| Brand | ABB / Thomas & Betts |
|---|---|
| Part Number | KS360250A |
| Series | KS |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse / Eaton Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | #3 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | #3 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, Padlock Attachment |
|---|---|
| Accessories | Lugs Not Included |
| Standards | UL 489, NEMA AB-1, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
5 answersWhich panelboards and switchboards accept the KS360250A circuit breaker?
This K-frame breaker is designed to bolt directly into legacy Westinghouse, Cutler-Hammer, and Eaton panelboards, switchboards, and motor control centers.
Can I use the Thomas & Betts KS360250A to replace a Cutler-Hammer breaker with the same part number?
Yes. Thomas & Betts previously rebranded Cutler-Hammer circuit breakers. This unit is physically and electrically identical to the Cutler-Hammer or Eaton KS360250A and serves as a direct drop-in replacement.
Are the lugs included with the KS360250A suitable for both aluminum and copper wiring?
Yes, the standard factory lugs are dual-rated for both aluminum and copper conductors ranging from #3 AWG up to 350 kcmil. Ensure proper torque specifications are followed during installation to prevent thermal issues.
How does the adjustable magnetic trip function work on the KS360250A?
While the thermal overload protection is fixed at 250 amps, the magnetic trip is adjustable. This allows electricians to fine-tune the short-circuit response threshold to coordinate with downstream breakers and prevent nuisance tripping.
What type of protection does the LI trip function provide?
The LI designation indicates Long-Time and Instantaneous protection. The thermal component provides Long-Time protection against sustained overloads, while the magnetic component delivers Instantaneous protection against severe short circuits.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.