Schneider Electric FHL36000M1586B Circuit Breaker

Schneider Electric's Square D FHL36000M1586B is a 3-pole molded-case switch/circuit breaker rated for 100 A with a 600 V maximum, designed for feed-through installations and featuring line- and load-side lug terminals with faston-tab lugs on select poles. The 1586B suffix marks a legacy OEM/bulk-pack variant, and Schneider Electric notes that this model is obsolete and has been replaced by the HGL36000S15 molded-case switch (S37423), with field installation of the S37423 onto the center and left poles as needed. In electrical terms, the device provides instantaneous, magnetic-only protection (I) with a 25 kA short-circuit rating at 480 V, in an F-frame, three‑phase configuration, and it weighs about 5 lb. It carries UL approval as part of the Square D family. Because it is an older part, compatibility with modern enclosures typically requires the HGL36000S15 replacement and adherence to Schneider Electric retrofit guidance.