Generac Transfer Switch 0K8904 Contactor Mechanism RXG RTS 200A OEM New

Generac Transfer Switch 0K8904 Contactor Mechanism RXG RTS 200A OEM New.

Restore Positive Power Transfer & Safe Electrical Isolation: Genuine Generac 0K8904

Eliminate failed emergency power transfer, welded electrical contacts, mechanical linkage binding, humming solenoids, and grid backfeed hazards on your standby power system. This Genuine Generac Factory OEM Transfer Switch Assembly (Part Number 0K8904 / 0K89040SRV) is the authentic high-current contactor and switching mechanism engineered explicitly for Generac automatic transfer switches (including RXG, RTS, and Guardian series enclosures across designated 100A, 150A, and 200A configurations) . When utility power drops in severe weather, the transfer switch mechanism must shift high-amperage household loads to generator power without arcing or hesitation.

Manufactured to Generac's exacting utility and electrical safety standards (UL 1008 compliant design), this heavy-duty dual-throw switching unit features heavy silver-alloy contact pads engineered to resist extreme arc erosion and pitting during high inductive motor transfers. The robust bi-directional solenoid actuator delivers crisp, instantaneous throw action, while integrated mechanical and electrical interlocks physically prevent simultaneous connection of utility and generator power sources. Built with high-dielectric molded arc chutes to rapidly quench switching flashover, it arrives factory-calibrated for direct bolt-in replacement into original Generac ATS cabinet sub-panels.

This authentic factory replacement component is cataloged under Generac OEM Part Number 0K8904 (0K89040SRV / Switch, Transfer / ATS Contactor Assembly / 2-Pole Transfer Mechanism) .

Why This Genuine Generac 0K8904 OEM Transfer Mechanism is the Pro Standard:

100% Genuine Factory OEM Component: Manufactured directly by Generac to maintain factory UL 1008 safety ratings and system reliability.

Positive Mechanical Interlock Protection: Physically prevents the utility and generator contacts from closing simultaneously, eliminating catastrophic backfeed.

Arc-Resistant Silver Alloy Contacts: Engineered to handle high locked-rotor inductive start loads (central HVAC, heat pumps) without contact welding or pitting.

Rapid Solenoid Actuation: Delivers fast, positive-break switching action to minimize transfer interruption times across connected circuits.

Direct Drop-In Cabinet Fitment: Designed with factory mounting foot patterns and terminal lug geometry for clean, safe installation into existing Generac ATS enclosures.

Technical Specifications:

Brand: Genuine Generac Power Systems (OEM Factory Original)

Part Number: 0K8904 (0K89040SRV)

Component Type: Automatic Transfer Switch (ATS) Contactor / Switching Mechanism

Application Location: Mounts inside internal sub-panel of Generac ATS NEMA 1 / NEMA 3R enclosures

Poles: 2-Pole (Single Phase 120V / 240V AC)

Switching Action: Double-Throw, Mechanically Held & Electrically Operated

Safety Ratings: Engineered to meet UL 1008 Transfer Switch Safety Standards

Condition: Brand New in Official Factory Packaging

Guaranteed Equipment Model Compatibility Matrix:

Specifically engineered for direct fitment across Generac residential and commercial automatic transfer switch platforms:

Generac Automatic Transfer Switch Cabinets:

Fits designated Generac RXG Series Smart Transfer Switches (specifically designated 100A, 150A, and 200A configurations specifying part number 0K8904).

Fits designated Generac RTS Series automatic transfer switches.

Fits designated Generac Guardian Series home standby ATS enclosures calling for switch mechanism 0K8904 / 0K89040SRV.

Private-Label Generac-Built ATS Systems:

Compatible with designated ATS enclosures manufactured by Generac under the Honeywell, Siemens, and Eaton brands specifying internal part number 0K8904.

Direct Application: Direct factory replacement for any electrical schematic, cabinet door diagram, or service manual specifying transfer switch assembly 0K8904 or 0K89040SRV.

🛠️ Pro-Maintenance Tip: Watch the "High-Voltage De-Energization & Terminal Lug Torque Secret!" High-Voltage Safety Warning: Servicing an automatic transfer switch is dangerous and involves multiple live power feeds! Before opening the cabinet or touching the 0K8904 switch, you MUST disconnect and lock out both power sources: turn off the main upstream utility service breaker/meter disconnect, switch the generator control panel to OFF , turn off the generator's onboard line breaker, and pull the 7.5A control fuse and disconnect the generator starter battery. Always verify with a calibrated CAT III/IV digital multimeter that both the utility and generator terminal bus bars are 100% de-energized (0.00V) before proceeding. Terminal Lug Torque Secret: When reconnecting heavy gauge copper or aluminum service entrance feeder cables to the contactor terminals, always use an insulated torque wrench and tighten the terminal lugs to the exact torque stamped on the switch cabinet label (typically 250–275 in-lbs for large feeder conductors). Loose lug connections create high resistance points that generate extreme heat, melting the switch housing under heavy summer air conditioning loads.

Specifications

• Compatible Brand: For Generac
• Type: Transfer Switch
• Number in Pack: 1
• Model: Xfrsw 50A 2P 240V
• Country of Origin: United States

Condition: New