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The B1497204 is a genuine OEM thermal fusible link rated to open at 144°C (291°F), designed for the Goodman GUP100-4A furnace. This one-shot safety device is wired in the control circuit and permanently opens if the furnace cabinet reaches an unsafe temperature — for example due to a blocked flue, failed blower, or overheating condition. If your furnace is completely dead with no control voltage, a blown fusible link is a common and inexpensive fix.
Because this is a safety cutout, the trip temperature must be exact. The OEM B1497204 is rated precisely to 144°C with the correct lead length and terminals. A generic link with a different rating can trip prematurely or, dangerously, fail to trip. Important: a fusible link that has blown indicates an underlying overheat problem — always diagnose and correct the root cause before replacing.
Easy — Disconnect power, unplug or splice the two leads, mount the new link in place, and reassemble. About 10 minutes, but pair the repair with a full airflow and safety check.