Trane RLY-0989 Add-A-Relay 120V Coil SPDT Auxiliary Relay

Description:

The Trane RLY0989 add-a-relay is an OEM auxiliary relay used in Trane commercial HVAC systems to provide additional switching capacity for control circuits, allowing low-power control signals to operate higher-current electrical loads. Featuring a 120 VAC coil and SPDT (Single Pole Double Throw) contact configuration, this relay is commonly installed in Trane rooftop units, air handlers, chillers, and control panels for compressor control, fan sequencing, alarm functions, and auxiliary equipment switching. HVAC service technicians and maintenance personnel use the RLY0989 relay for replacement, repair, control circuit expansion, and preventive maintenance.

Applications:

The Trane RLY0989 add-a-relay is designed to isolate control circuits while providing an additional SPDT switching contact for HVAC control logic, equipment interlocks, status indication, and auxiliary device control. It is commonly used in commercial office buildings, hospitals, schools, manufacturing facilities, central chiller plants, and rooftop HVAC systems where reliable relay operation and expanded control functionality are required.

Technical Specifications:

• Manufacturer Part Number (MPN): RLY0989
• Alternate Part Number: RLY-0989
• Manufacturer: Trane
• Product Type: Add-A-Relay
• Relay Type: Electromechanical Auxiliary Relay
• Coil Voltage: 120 VAC
• Frequency: 60 Hz
• Contact Configuration: SPDT (Single Pole Double Throw)
• Function: Auxiliary Switching and Control Circuit Expansion
• Compatible Equipment: Trane Rooftop Units, Air Handlers, Chillers, and Commercial HVAC Equipment (model dependent)
• Controlled Devices: Compressors, Fan Motors, Contactors, Alarm Circuits, Valves, and Auxiliary Controls
• Mounting Type: Panel Mount
• Installation: OEM Replacement Relay
• Application Environment: Commercial HVAC, Industrial Control Panels, Building Automation Systems, and Refrigeration Equipment

Common Replacements:

• Trane RLY0989 OEM Add-A-Relay
• Trane auxiliary relay with matching 120 VAC coil and SPDT contact configuration
• Functional equivalent SPDT relay with identical electrical ratings and mounting configuration