General Purpose Relay with SPNO Switch

90290 MARS FAN RELAY 24V SPNO 90-290Q 113561

The MARS 90290 Fan Relay is a professional-grade single-pole relay designed for precise control in HVAC and general electrical systems. As part of the MARS Series 903 line, this relay provides dependable switching performance for fan motors and other inductive loads activated by a low-voltage control circuit. Its robust coil design and mechanical stability make it ideal for integration into air conditioning and forced-air systems, offering direct compatibility with the WR/Essex/RBM Type 84 series relays.

Technical Specifications

• Manufacturer: MARS (Motors & Armatures, Inc.)
• Series: 903
• Model Number: 90290
• Part Number: 113561
• Type: Power Fan Relay
• Coil Voltage: 24 VAC, 60 Hz
• Contact Configuration: SPNO (Single Pole Normally Open)
• Contact Rating: 18 A resistive load
• Poles: 1
• Terminals: Quick-connect type for efficient field installation
• Mounting Style: Panel or chassis mounting, suitable for HVAC control assemblies
• Width: 2.056 inches
• Height: 2.5 inches
• Frequency: 60 Hz operation
• Electrical Insulation: Designed for control voltage isolation in standard HVAC applications
• Replacement Compatibility: Direct replacement for WR/Essex/RBM Type 84 (Models 90-290 through 90-295)
• Applications: HVAC fan control, blower motors, standby power control, and low-voltage automation circuits

Professional Summary

The MARS 90290 Fan Relay is engineered for technicians and contractors who require dependable relay performance in air conditioning and electrical control systems. Its SPNO configuration supports reliable on-demand circuit activation through a 24 VAC control signal. The unit’s quick-connect terminals and standardized footprint simplify retrofits and service replacements in field applications. With its durable coil construction, precise mechanical alignment, and compatibility with Type 84 configurations, the 90290 relay offers consistent performance and electrical reliability for HVAC and general-purpose control environments.