RJSPHH Smart AC Module (SACM) for Generac ATS — A0004499959 Direct Replacement 100/200A, 1-Year Warranty

RJSPHH A0004499959 Smart AC Module (SACM) is a direct replacement load-shed/control module designed to restore automatic transfer switch operation in Generac 100 and 200 amp ATS units.

If your Generac automatic transfer switch (ATS) fails to change positions during a utility outage, the fault often traces to the load-shed or SACM control module. This RJSPHH replacement part—compatible with part numbers A0004499959 and 10000004183—measures 6.1 in x 3.1 in and is built to snap into existing ATS control locations. It provides a like-for-like replacement to get your transfer switch back to reliably sensing and shedding loads when necessary. The module ships with a one-year warranty and technical support within 24 hours for installation or compatibility questions.

How will this module fix an ATS that won't transfer?

When an ATS fails to transfer, it may be because the load-shed module no longer communicates with the transfer switch logic or has developed internal faulting. Replacing the module restores the control circuitry that senses utility status and commands the ATS contactor to switch to generator power. Install is generally straightforward for qualified technicians and returns the ATS to normal automatic operation.

• Direct replacement for Generac part numbers A0004499959 and 10000004183
• Restores transfer switch control and load-shedding signals
• Fits 100-amp and 200-amp Generac ATS configurations
• Saves time over diagnosing multiple ATS subcomponents

What are the physical and electrical specifics I need to know?

The RJSPHH SACM comes in a compact module sized 6.1 in x 3.1 in that aligns with the mounting and connector locations of compatible Generac transfer switches. While installation requires basic electrical safety practices and familiarity with ATS internals, the replacement does not require modifying the transfer switch housing or major rewiring when matching part numbers.

• Dimensions: 6.1 in x 3.1 in for straightforward mounting
• Engineered to meet form-fit requirements for Generac 100/200A ATS
• Connector locations match OEM module footprints for plug-and-play swaps
• Designed for indoor enclosure installation inside the ATS cabinet

How easy is installation and what safety steps should I follow?

Installation should be performed by a licensed electrician or trained technician familiar with transfer switch operation. Before replacing the module, isolate all power sources—utility and generator—and verify de-energized circuits to prevent shock. Test the ATS after installation to confirm proper transfer and load-shed behavior under simulated outage conditions.

• Turn off and lock out both utility and generator power before opening the ATS
• Document and label wiring connections before unplugging the old module
• Use anti-static handling and avoid bending connector pins during swap
• Perform a controlled functional test once re-energized to verify correct operation

What support and warranty come with this replacement module?

RJSPHH backs this SACM with a one-year limited warranty covering manufacturing defects. If you encounter compatibility or performance issues, contact RJSPHH support for troubleshooting and warranty service; responses are provided within 24 hours to get installations moving again.

• One-year limited warranty included with the module
• Customer support available for compatibility and installation questions
• Prompt 24-hour response window for reported issues
• Documentation tips available for technicians upon request

Who this is for: This RJSPHH A0004499959 Smart AC Load Shed Module is intended for electricians, facility maintenance teams, and homeowners working with Generac 100A or 200A automatic transfer switches that require a compatible control-module replacement. It’s suited to technicians seeking a compact, OEM-equivalent module to restore automatic transfer and load-shedding functions without extensive retrofitting.