Square D KA36250 Molded Case Circuit Breaker | 250A 3-Pole 600V I-Line Plug-In
Square D KA36250 Molded Case Circuit Breaker | 250A 3-Pole 600V I-Line Plug-In
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Square D KA36250 – 250 Amp Molded Case Circuit Breaker, I-Line Style Plug-In
The Square D KA36250 is a heavy-duty, 3-pole thermal magnetic molded case circuit breaker engineered for reliable overcurrent protection in commercial and industrial power distribution systems. Part of Square D's trusted I-Line family (Type KA, K Frame), this breaker delivers 250 amps of continuous protection at up to 600V AC — making it a go-to solution for high-demand electrical panels and switchboards.
Whether you're upgrading an existing I-Line panel, replacing a discontinued unit, or specifying equipment for a new installation, the KA36250 offers the performance, compatibility, and safety ratings your application demands.
Product Specifications
| Part Number | KA36250 |
| Manufacturer | Square D (Schneider Electric) |
| Series / Family | I-Line (Type KA) |
| Frame | K Frame |
| Amperage | 250A at 40°C |
| Voltage Rating | 600V AC |
| Number of Poles | 3 Pole / 3 Phase |
| Connection Type | I-Line Style Plug-In |
| Trip Type | Thermal Magnetic (Non-Interchangeable) |
| Trip Functions | LI – Long-Time and Instantaneous |
| Interrupting Rating @ 240V AC | 42 kA |
| Interrupting Rating @ 480V AC | 25 kA |
| Interrupting Rating @ 600V AC | 22 kA |
| Interrupting Rating @ 250V DC | 10 kA |
| Wire Range (Lug Kit) | #4 AWG – 350 kcmil (AL) / #4 – 250 MCM (CU) |
| Mounting | I-Line Panel Plug-In (no additional hardware required) |
| Weight | 8.67 lbs |
| Standards | UL / CSA / NOM Listed |
Why Choose the Square D KA36250?
- Proven I-Line Compatibility: Designed to plug directly into Square D I-Line panelboards — no tools or additional hardware required for mounting.
- Thermal Magnetic Protection: Provides dual-mode protection — thermal response for sustained overloads and instantaneous magnetic trip for short circuits.
- High Interrupting Capacity: Rated up to 42 kA at 240V AC, ensuring safe fault clearing in high-energy environments.
- 3-Phase Industrial Grade: Built for 3-phase power systems commonly found in manufacturing facilities, commercial buildings, and data centers.
- Drop-In Replacement: A direct replacement for existing KA-frame I-Line breakers, minimizing downtime during maintenance or upgrades.
Common Applications
- Industrial motor protection and control panels
- Commercial building power distribution boards
- HVAC and mechanical equipment circuits
- Manufacturing and process control systems
- Data centers and critical infrastructure
Frequently Asked Questions
What panels is the KA36250 compatible with?
The KA36250 is designed for Square D I-Line style panelboards and switchboards that accept plug-in style breakers. It does not require additional mounting hardware — it plugs directly into the bus.
What is the interrupting rating of the KA36250?
The KA36250 has an interrupting rating of 42 kA at 240V AC, 25 kA at 480V AC, 22 kA at 600V AC, and 10 kA at 250V DC.
Is the KA36250 a thermal magnetic or electronic trip breaker?
It is a thermal magnetic breaker with non-interchangeable trip, offering LI (Long-Time and Instantaneous) protection functions.
Can I add a shunt trip or auxiliary contact to the KA36250?
Yes — the KA36250 supports accessories including shunt trips, auxiliary contacts, and under-voltage releases (UVR). Contact us for accessory compatibility and availability.
Is this a new or reconditioned unit?
This listing is for a New unit (SKU: KA36250-N). New-in-box condition, ready for immediate installation.