Square D KA36225 Molded Case Circuit Breaker | 225A 3-Pole 600V I-Line Plug-In

Square D KA36225 — 225 Amp Molded Case Circuit Breaker

The Square D KA36225 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 series, the KA36225 delivers consistent, code-compliant performance in demanding environments.

Available in New and Used/Reconditioned conditions — both backed by our quality assurance commitment.

Key Specifications

• Part Number: KA36225
• Manufacturer: Square D / Schneider Electric
• Series: I-Line (Type KA)
• Amperage: 225A
• Poles: 3-Pole, 3-Phase
• Voltage Rating: 600V AC / 250V DC
• Interrupting Rating: 25kA @ 480V AIC
• Trip Type: Thermal Magnetic — LI (Long-Time & Instantaneous)
• Mounting Style: I-Line Style Plug-In
• Frame: KA Frame (250A Frame)
• Dimensions: 4.75" x 4.5" x 8"
• Weight: 7.9 lbs
• Operating Temperature: 40°C

What Is the Square D KA36225?

The KA36225 is a molded case circuit breaker (MCCB) designed to protect electrical circuits from damage caused by overloads and short circuits. It uses thermal magnetic trip technology — the thermal element responds to sustained overloads over time, while the magnetic element reacts instantly to short-circuit fault currents. Together, these provide a dual-layer defense that keeps industrial panels and distribution boards operating safely.

Its I-Line plug-in design allows fast, tool-reduced installation directly onto compatible Square D I-Line panelboards and switchboards — making it ideal for both new construction and retrofit projects where minimizing downtime is critical.

Common Applications

• Industrial power distribution panels
• Commercial electrical switchboards
• Motor feeder circuit protection
• Manufacturing facility branch circuit protection
• Retrofit and replacement of discontinued I-Line breakers

Why Choose Alpha Brokers & Controls?

• ✅ New and quality-tested used units available
• ✅ Fast shipping on in-stock inventory
• ✅ Knowledgeable team specializing in industrial electrical components
• ✅ Competitive pricing on hard-to-find and discontinued breakers

Frequently Asked Questions

Is the Square D KA36225 discontinued?

Yes, the KA36225 has been discontinued by Schneider Electric / Square D. However, it remains widely available through authorized surplus and secondary market suppliers like Alpha Brokers & Controls. Used and reconditioned units are a cost-effective alternative for replacement and maintenance needs.

What panelboards is the KA36225 compatible with?

The KA36225 is compatible with Square D I-Line style panelboards and switchboards that accept I-Line plug-in breakers in the 250A frame class.

What is the interrupting rating of the KA36225?

The KA36225 has a standard interrupting capacity of 25kA at 480V AC, making it suitable for most commercial and light industrial fault current environments.

What does "thermal magnetic" mean in a circuit breaker?

Thermal magnetic circuit breakers use two protection mechanisms: a bimetallic strip that heats and trips under prolonged overload (long-time protection), and an electromagnetic coil that trips instantaneously under high short-circuit currents. The KA36225 includes both LI — Long-Time and Instantaneous trip functions.

What is the difference between new and used condition?

New units are unused, in original or equivalent condition. Used/reconditioned units have been inspected and tested to confirm proper operation. Both options are clearly labeled and priced accordingly.