Square D KH36250 Molded Case Circuit Breaker

No. The KH36250 features an I-Line style plug-in mounting configuration. It is explicitly designed for use in Square D I-Line panelboards and switchboards. NQ and NF panels utilize entirely different breaker frame styles and bus configurations.

The breaker features a plug-on line side that snaps directly onto the panelboard bus assembly. A captive mounting screw on the breaker bracket secures it to the panel backpan. The load side provides standard mechanical lugs for field wire terminations.

The factory installed mechanical lugs accept copper or aluminum conductors ranging from 4 AWG to 350 kcmil. Always refer to NEC guidelines for proper conductor ampacity rating and torque the lug setscrews to the specifications printed directly on the breaker faceplate.

Square D transitioned from the legacy K-Frame to the PowerPact J-Frame series. For new installations or total system upgrades, models like the JJA36250 or JGA36250 are used. However, the KH36250 remains an exact-fit replacement component for servicing existing I-Line infrastructure without requiring panel modifications.

The H in the KH series denotes High Interrupting Capacity. While a KH and KA breaker share identical physical dimensions and I-Line mounting footprints, the KH36250 provides elevated short-circuit protection, delivering 35kAIC at 480VAC to safely handle higher fault currents.

The KH36250 utilizes a thermal magnetic trip unit with a fixed thermal element for long-time overload protection. The instantaneous magnetic trip is adjustable. Electricians can set the magnetic pickup threshold using the adjustment dial on the front faceplate to properly coordinate with downstream devices and available fault current.

Verify the panelboard is properly de-energized. Inspect the breaker plug-on jaws and the panel bus for debris, oxidation, or signs of pitting. Ensure the captive mounting bracket is free of damage so the retaining screw can provide the torque required for a secure, low-resistance electrical connection.