Square D KA36200 | 200A 3-Pole 600V I-Line Molded Case Circuit Breaker

The Square D KA36200 is a heavy-duty, 3-pole thermal magnetic molded case circuit breaker engineered for reliable overcurrent protection in demanding industrial and commercial power distribution systems. Rated at 200 Amps and 600 VAC, it features an I-Line style plug-in connection for tool-free, fast installation directly onto Square D I-Line panelboards and busway systems — no mounting hardware required.

With LI (Long-Time and Instantaneous) trip protection, the KA36200 delivers precise fault detection that guards three-phase circuits against both sustained overloads and dangerous short-circuit events. Its K-frame construction and thermal magnetic trip unit make it a trusted choice for electricians, facilities managers, and MRO procurement teams across manufacturing, utilities, and commercial construction.

Key Specifications

What Is an I-Line Style Plug-In Circuit Breaker?

An I-Line style plug-in circuit breaker is a molded case breaker designed to connect directly to Square D I-Line panelboards and busway systems without the need for separate mounting hardware. The breaker "plugs in" to the bus, making installation faster and field replacement significantly easier compared to traditional bolt-in styles. This design is exclusively compatible with Square D I-Line panelboards.

What Is a Thermal Magnetic Circuit Breaker?

A thermal magnetic circuit breaker uses two mechanisms for protection:

• Thermal element — responds to sustained overloads using a bimetal strip that bends with heat, tripping the breaker after a time delay proportional to the overload magnitude.
• Magnetic element — responds instantaneously to high-magnitude short-circuit currents, providing near-instant disconnection to protect equipment and personnel.

Together, these mechanisms deliver the dual-mode protection defined by the LI (Long-Time and Instantaneous) trip function in the KA36200.

Applications & Compatibility

The Square D KA36200 is widely used across:

• Industrial motor control centers (MCCs)
• Commercial electrical distribution panels
• Square D I-Line busway and panelboard systems
• Manufacturing facilities and utilities infrastructure
• HVAC equipment and large commercial loads

Compatible panelboard families: Square D I-Line Series (NF, PF, and HF frames accepting K-frame plug-in breakers). Verify your panelboard's busbar rating and frame compatibility before installation.

Why Choose Alpha Brokers & Controls?

• ✅ Genuine, inspected electrical components
• ✅ Fast, reliable shipping on in-stock items
• ✅ Expert support for specification and compatibility questions
• ✅ Trusted by electricians, contractors, and facilities teams

Frequently Asked Questions

Q: Is the KA36200 compatible with all Square D panelboards?
A: No. The KA36200 uses an I-Line plug-in connection and is only compatible with Square D I-Line style panelboards that accept K-frame breakers. It is not compatible with QO or Homeline panels.

Q: What is the interrupting rating of the KA36200?
A: The KA36200 is rated at 42 kA at 240 VAC, 25 kA at 480 VAC, and 22 kA at 600 VAC under UL/CSA/NOM standards.

Q: What does LI trip function mean?
A: LI stands for Long-Time and Instantaneous. It means the breaker provides time-delayed protection against sustained overloads and immediate tripping for short-circuit faults.

Q: Does the KA36200 require a lug kit?
A: The I-Line plug-in connection attaches directly to the busbar without hardware. However, if cable lugs are required for field wiring, compatible lug kits include AL250KA for aluminum conductors and CU250KA for copper.

Q: What frame size is the KA36200?
A: The KA36200 belongs to the K-Frame (KA type), which covers the 70–250 amp range in the Square D I-Line family.