This S87R11a2b1d1 relay was manufactured by Potter & Brumfield and is compatible with both GE and Trane furnaces. It is a reliable and high-quality component for your heating system. The brand Potter & Brumfield is well-known for producing durable and efficient parts, making this relay a smart choice for any HVAC professional or homeowner. Its compatibility with multiple furnace models also adds to its versatility and usefulness. Don't miss out on the opportunity to upgrade your furnace with this superior Potter & Brumfield relay.