Trane 6400-1126-03 Quad Relay Output Interface Module

The Trane 6400-1126-03 UCP3 Quad Relay Output Board provides four isolated Form C (SPDT) relay outputs for controlling compressors, fans, valves, alarms, and auxiliary equipment within Trane commercial HVAC control systems. Designed for use with the Trane UCP3 control platform, this quad relay output PCB assembly (Rev. C) is commonly installed in commercial chillers, central plant equipment, and building automation installations requiring relay output control and equipment integration. Key specifications include four relay outputs with Form C contacts rated at 120 VAC, 2.8 A inductive and 7.2 A resistive (1/3 HP) and 240 VAC, 0.5 A resistive; compatibility with Trane UCP3; internal panel mounting; and OEM replacement installation. The product is identified by MPN 6400-1126-03 and is part of the Trane UCP3 Quad Relay Output Board family; common replacements include BRD04879, X13650806-03, and 6400-2678-01.