Honeywell Home RC840/U Electromechanical Relay without Transformer

Optimize line-voltage control for HVAC and building automation with the Honeywell Home RC840/U electromechanical relay. As an Aube-series relay designed for direct replacement of brand-name units, it simplifies retrofits and reduces downtime while delivering instant activation for precise temperature regulation. The epoxy-coated, sound-dampened design minimizes relay noise—beneficial in commercial offices, security closets and surveillance environments where quiet operation matters.

Built for dependable performance, the RC840/U operates at a minimum of 120V AC and draws low current so a single low-voltage thermostat can manage multiple relays, reducing controller count and wiring complexity. The terminal board connection speeds professional installation and service, saving labor on installs and maintenance. CSA and UL approvals help you meet code and compliance requirements for fire, security and building monitoring systems.

Ideal for HVAC contractors, integrators and facility managers, the Honeywell Home RC840/U provides reliable line-voltage switching for heating loads, access control and security/surveillance integrations. Order now or contact sales for volume pricing and installation support.

• Easy retrofit: direct replacement for brand-name relays to minimize downtime and reduce installation complexity
• Quiet, reliable switching: epoxy soundproofed construction for near-silent operation in occupied spaces
• Labor-saving terminal board: fast, professional installations that cut service time and wiring errors
• Low power draw: allows multiple relays to be controlled by a single thermostat to lower controller costs
• Code-ready confidence: CSA and UL approvals for fire, security and building monitoring applications