Square D KIL36250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Quantity
Square D KIL36250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy K-frame family, this 250A current-limiting breaker restricts let-through energy to safeguard downstream equipment. It serves commercial and industrial applications requiring robust interruption capabilities. The unit mount design features line and load lugs for installation into Square D enclosures and motor control centers. While this legacy KIL series is discontinued, it can be replaced by the modern PowerPacT JRL36250. It delivers a massive 200kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | KIL36250-R |
| Series | KIL |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480Y/277VAC, 200kA @ 480VAC, 100kA @ 600Y/347VAC, 100kA @ 600VAC |
| Frame Type | KIL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Enclosures, Switchboards, Motor Control Centers |
| 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 Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated |
| Special Features | Current Limiting |
Product FAQs
6 answersIs the Square D KIL36250 still in active production?
The KIL36250 is part of the legacy K-frame family and is no longer in active production. The modern replacement for this 250A current-limiting breaker is the PowerPacT J-frame, specifically the JRL36250, which offers the same 200kAIC rating at 480V.
What does the "LI" trip function mean on the KIL36250?
The "LI" designation indicates that this thermal-magnetic breaker includes Long-Time (L) and Instantaneous (I) trip functions. The thermal element provides fixed overload protection, while the magnetic element is adjustable to allow customization of the short-circuit trip threshold.
Can the KIL36250 be reverse fed?
Yes, standard thermal-magnetic K-frame breakers like the KIL36250 do not have line and load restrictions and can be reverse fed. However, always verify that no specific line or load markings are present on your exact unit before reverse feeding.
Is this breaker compatible with I-Line panelboards?
No, the KIL36250 is a unit-mount, feed-thru circuit breaker designed with line and load lugs. It is not compatible with I-Line panelboards, which require plug-on style connections. It is intended for use in standard Square D enclosures, switchboards, and motor control centers.
What is the purpose of a current-limiting circuit breaker like the KIL36250?
A current-limiting breaker is designed to clear a fault in less than half a cycle. By interrupting the current so quickly, it significantly reduces the peak let-through energy, which helps protect downstream equipment and wiring from severe thermal and mechanical stress during a short circuit.
Are legacy K-frame breakers physically interchangeable with modern PowerPacT replacements?
No, legacy K-frame breakers like the KIL36250 have different physical dimensions and mounting footprints compared to modern PowerPacT J-frame breakers. When upgrading to a newer model, modifications to the enclosure, busbar connections, or mounting hardware may be required.
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