Eaton / Westinghouse JB3200 Molded Case Circuit Breaker

This bolt-on Series C J-frame breaker is designed for installation in classic Westinghouse panelboards, Eaton Pow-R-Line panelboards, switchboards, and motor control centers.

Yes, the Eaton JB3200 shares the exact same Series C J-frame footprint as JD3200 and JDB3200 breakers, allowing for physical interchangeability. However, because the JB3200 has different interrupting ratings, you must verify that its fault current capacity meets your system requirements before using it as a substitute.

The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The Long-Time function protects against sustained overloads, while the Instantaneous function provides immediate tripping during severe short circuits.

This breaker features a fixed thermal and adjustable magnetic trip unit. The adjustable magnetic dial allows electricians to set the short-circuit pickup current, which typically ranges from 1000A to 2000A for this 200A model, allowing for precise coordination with downstream devices.

The standard lugs accept aluminum or copper wire ranging from 4 AWG to 350 kcmil. When using the standard TA250KB lugs, the required tightening torque is 275 lb-in. Always verify the torque specifications printed directly on the lug before finalizing terminations.

Always verify that the panelboard or switchboard is completely de-energized before installation. Because the JB3200 is a bolt-on device, ensure the busbar connections are properly aligned and torqued to the manufacturer specifications to prevent arcing and overheating.