Square D Q432350 Molded Case Circuit Breaker

It uses Square D I-Line plug-on jaw connections that clamp directly onto the bus stack. These feature a blow-on design where increased magnetic flux during a short circuit causes the jaws to grip the bus bars tighter.

The 3-pole Q432350 requires 4.5 inches of mounting space on the I-Line bus stack.

LI stands for Long-Time and Instantaneous trip functions. The Long-Time function provides delayed tripping for sustained overloads, while the Instantaneous function provides immediate tripping for severe short circuits.

While the thermal overload protection is fixed, the adjustable magnetic trip allows you to set the instantaneous short-circuit response threshold. This helps coordinate the breaker's trip curve with other protective devices in your system.

Both are 350A, 3-pole I-Line breakers that share the same physical dimensions and 4.5-inch bus space requirement. However, the Q432350 is rated for a maximum of 240VAC, whereas the LA36350 is rated for up to 600VAC.

No, the Q432350 is strictly an I-Line plug-in breaker designed for I-Line panelboards. If you need a unit-mount breaker with similar specifications, you must use a lug-to-lug frame like the Q4L3350 or LAL36350.

Yes, if your system requires a higher fault current rating than 25kA at 240V, you can upgrade to the LH36350. The LH frame provides up to 65kAIC at 240V while maintaining the same physical footprint and I-Line mounting.