Eaton / Cutler-Hammer KS220400A Molded Case Circuit Breaker
- 400A
- 2 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer KS220400A - 400A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Providing dependable overcurrent protection for commercial facilities, the KS220400A is a 2-pole, 400A MCCB from Eaton. It features a fixed thermal and adjustable magnetic trip unit, delivering precise long-time and instantaneous defense. This unit-mount breaker integrates into Eaton Series C panelboards and switchboards. It serves as a replacement for older systems and is substituted by the KD2400. Rated for 42 kAIC at 240V, this HACR-rated breaker includes standard line and load lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | KS220400A |
| Series | KS |
| Amperage | 400A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 3/0 AWG - 250 kcmil (Al/Cu) or (1) 500-750 kcmil (Al/Cu) |
| Max Wire | 750 kcmil |
| Min Wire | 3/0 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 Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat enclosures and systems are compatible with the KS220400A?
This K-Frame breaker is designed for installation in Eaton and Cutler-Hammer Series C panelboards, switchboards, and motor control centers.
What wire sizes are accepted by the standard lugs on this breaker?
The standard lugs accept either two 3/0 AWG to 250 kcmil conductors or one 500 to 750 kcmil conductor. The terminals are rated for both aluminum and copper wire.
How does the adjustable magnetic trip function work on the KS220400A?
The thermal-magnetic trip unit features a fixed thermal element for overload protection and an adjustable magnetic element. The magnetic dial allows electricians to fine-tune the instantaneous short-circuit response to coordinate with downstream devices and inrush currents.
What does the LI trip function code mean for this K-Frame breaker?
The LI designation indicates Long-Time and Instantaneous protection. Long-Time handles sustained overloads based on the 400A fixed thermal rating, while Instantaneous clears high-level short circuits based on the adjustable magnetic setting.
Can the KS220400A be applied in direct current (DC) systems?
Yes, this thermal-magnetic breaker is rated for 250VDC applications with a 10kA interrupting capacity, allowing it to be used in battery systems, DC drives, and other industrial DC circuits.
Is this breaker a unit-mount or plug-in style?
The KS220400A is a unit-mount breaker. It must be bolted directly to the bus or mounting pan within the enclosure, rather than plugging onto a busbar.
Can this breaker replace older Westinghouse K-Frame models?
Yes, Eaton Series C K-Frame breakers like the KS220400A are backward compatible and can directly replace legacy Westinghouse and Cutler-Hammer K-Frame breakers with matching pole and amperage configurations.
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.