GE 437D491 Rev. F Motherboard for Total Lighting Control Panels – Central Logic PCB for GE TLC Systems

Condition: Used – Professionally pulled from a working environment. Tested and verified functional. No damaged traces or burned components.

UPC/GTIN: 641752894785

The GE 437D491 Revision F Motherboard is a critical central logic and control board engineered for General Electric’s Total Lighting Control (TLC) systems. Installed inside GE lighting automation panels, this motherboard is responsible for managing communication between zone controllers, relays, override switches, and external interfaces.

The Rev. F version represents an updated production run, offering enhanced reliability, firmware compatibility, and in some cases updated circuitry over earlier revisions. This makes it essential for repairs, system upgrades, or modular expansion in existing TLC installations found in commercial, institutional, and industrial environments.

This board is designed to interface with low-voltage control components and likely operates over RS-485-based serial communication, with specific GE protocol support for integrated lighting logic.

Features:

• Model / Part Number: 437D491

• Revision: F

• Product Type: Lighting control panel motherboard

• Mounting: Chassis or DIN rail-mounted inside TLC panel enclosure

• Connector Interfaces:

  • Edge connectors for GE relay control modules

  • Terminal blocks for wall switches / zone overrides

  • Ribbon connectors for submodules

  • RJ or modular jacks for network/communication bus

• Status LEDs: For communication, power state, and zone diagnostics

• Control Protocol: GE-specific, likely RS-485 or similar

• Power Input: Typically supplied via 24 VAC transformer, converts internally to 12–24V DC logic

• Construction: Multi-layer PCB with conformal coating (model-dependent)

• Manufacturer: General Electric

• Country of Manufacture: United States

• Dimensions: 12″ W × 6″ H × 17″ D

• Weight: Approx. 2.00 lbs

Applications:

• GE Total Lighting Control (TLC) systems

• Centralized lighting systems in:

  • Retail buildings

  • Hospitals and healthcare facilities

  • School districts and universities

  • Corporate offices

  • Industrial automation lighting systems

• Suitable for both repair/replacement and expansion modules

Cross-Referenced or Related Models:

• GE 437D491 Rev E – earlier revision, potentially lower compatibility

• GE 437D491 Rev G – possible newer iteration with minor firmware changes

• GE TLC Panels – main lighting control cabinets housing this board

• GE Relay Driver Cards – interface via this motherboard

• GE Zone Switch Modules / Wall Overrides

Comparable Products:

• Lutron GP Panels Central Processor Boards

• Leviton Z-Max Relay Panel Controllers

• Wattstopper Lighting Control Boards

• Crestron DIN-AP3 lighting control CPUs (for modular commercial use)

• Douglas Lighting Systems T485-xxx series

Features:

Part Number: 437D491
Revision: F
Function: Lighting control panel motherboard (central logic and communication board)
Mounting Type: Chassis/rail-mounted within GE TLC panel
Connector Types:
Edge connectors for relay driver cards
Terminal blocks for zone switches and overrides
Ribbon and modular jacks for communication links
Compatibility: Designed for GE Total Lighting Control panels
Power Supply Handling: Receives power from panel PSU and distributes to logic modules
Communications: Likely RS-485 or similar (GE protocol-based)
Voltage Handling: Low-voltage logic control (typically 12–24V DC internal operation)
Status LEDs: Diagnostic indicators for communication, power, or zone faults

Applications:

GE Total Lighting Control (TLC) systems in:
Commercial buildings and office spaces
K-12 schools and university campuses
Hospitals and medical facilities
Retail outlets and shopping centers
Industrial buildings requiring automated or scheduled lighting
Central logic board in relay control cabinets
Part of retrofit and expansion upgrades for existing GE TLC panels

Cross-Referenced / Compatible Models:

GE TLC Panels: All models that use 437D491 mainboard, including:
TLC Lite, TLC Modular Panels
GE Relay Cabinet Systems with programmable logic
Alternate PNs or compatible versions:
437D491 Rev. C/D/E (older revisions of same board)
GE 437D493 – Auxiliary motherboard (used in tandem)
TLC Smart System Subpanels and Switch Interface Modules (SIMs)

Comparable Products:

Lutron Quantum QS processors – Similar role in advanced lighting systems
Leviton GreenMAX Relay Panels – Alternative commercial-grade lighting controls
Wattstopper LCAP panel controllers – Comparable lighting control logic boards
Crestron CLS-EXP family – Distributed lighting automation systems
Note: While these are functionally similar, they are not drop-in replacements, and the 437D491 is specific to GE panels.

Part of Larger Systems:

The 437D491 motherboard is the core of GE lighting control enclosures, providing:
Power and signal routing between the power supply, relays, and control inputs
Integration with lighting schedules, occupancy sensors, or manual override switches
Connectivity to central control software or BACnet/MSTP networks (depending on configuration)
May be used alongside:
GE Relay Driver Boards
Power supplies (e.g., GE 437D492)
Override/Zone Control Switch Inputs
Time clocks or building management integration modules

⚠️ Trademark Disclaimer:
All product names, logos, brands, and other trademarks mentioned are the property of their respective owners. These names are used solely for identification purposes and do not imply endorsement or affiliation with General Electric.

Related:
GE lighting controller motherboard
437D491 Rev F main PCB
lighting automation system central board
GE TLC lighting panel logic board
control panel replacement PCB
commercial lighting control interface board

Common Requests:
“Replacement motherboard for GE lighting control panel”
“What is GE 437D491 Rev. F used for?”
“Used vs new lighting control panel motherboards”
“GE TLC relay panel control board replacement”
“Open box 437D491 compatible systems”

All product names, trademarks, and registered trademarks are the property of their respective owners. Use of these names does not imply any affiliation or endorsement.

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