Trane RLY3346 Power Relay
The Trane RLY3346 is a heavy-duty 24V 50A DPST-N/O Power Relay designed for high-amperage switching in residential and light commercial HVAC systems. This OEM Trane replacement relay is the direct service match for legacy part numbers CTR0503 and CTR00503, ensuring precise mechanical fit and electrical compatibility without the need for field modifications. Engineered as a double pole single throw component, it simultaneously manages both legs of a 208-230V circuit, making it a critical HVAC contactor relay for controlling high-inductive loads such as compressors, condenser fan motors, and electric heating elements.
With a 50-amp switching capacity at 277 VAC, the RLY3346 power relay provides superior arc suppression compared to universal alternatives, significantly reducing contact pitting and extending the service life of the equipment. The 24VAC control coil is optimized for standard HVAC control circuits, delivering reliable engagement in demanding environments. This genuine Trane part maintains factory-spec safety standards, providing the robust performance required for high-tonnage heat pumps and air handlers.
Key Benefits- OEM Compatibility: Professional-grade direct replacement for CTR0503 and CTR00503, preserving system integrity.
- High-Amperage Rating: Rated for 50A to handle heavy start-up loads of compressors and large motors.
- DPST Configuration: Features two normally open contacts to switch both power legs in 230V applications.
- Verified Performance: Built to withstand industrial-level cycling in Trane and American Standard units.
Can the RLY3346 replace a lower-rated 30A or 40A relay?
Yes, the 50A rating of the RLY3346 offers increased overhead and durability for systems originally equipped with lower-amperage components, provided the physical footprint and 24V coil voltage match.
What are the symptoms of a failing RLY3346 power relay?
Common indicators include a compressor that fails to start despite receiving a 24V signal, audible "chattering" from pitted contacts, or a burnt electrical odor near the control board.
Is this a direct fit for older American Standard units?
As a Service First OEM component, this relay is the standard replacement for various Trane and American Standard models. Always verify your specific model number against the original schematic.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $198.95
-65%$198.95
$69.63Trane RLY3346 Power Relay
The Trane RLY3346 is a heavy-duty 24V 50A DPST-N/O Power Relay designed for high-amperage switching in residential and light commercial HVAC systems. This OEM Trane replacement relay is the direct service match for legacy part numbers CTR0503 and CTR00503, ensuring precise mechanical fit and electrical compatibility without the need for field modifications. Engineered as a double pole single throw component, it simultaneously manages both legs of a 208-230V circuit, making it a critical HVAC contactor relay for controlling high-inductive loads such as compressors, condenser fan motors, and electric heating elements.
With a 50-amp switching capacity at 277 VAC, the RLY3346 power relay provides superior arc suppression compared to universal alternatives, significantly reducing contact pitting and extending the service life of the equipment. The 24VAC control coil is optimized for standard HVAC control circuits, delivering reliable engagement in demanding environments. This genuine Trane part maintains factory-spec safety standards, providing the robust performance required for high-tonnage heat pumps and air handlers.
Key Benefits- OEM Compatibility: Professional-grade direct replacement for CTR0503 and CTR00503, preserving system integrity.
- High-Amperage Rating: Rated for 50A to handle heavy start-up loads of compressors and large motors.
- DPST Configuration: Features two normally open contacts to switch both power legs in 230V applications.
- Verified Performance: Built to withstand industrial-level cycling in Trane and American Standard units.
Can the RLY3346 replace a lower-rated 30A or 40A relay?
Yes, the 50A rating of the RLY3346 offers increased overhead and durability for systems originally equipped with lower-amperage components, provided the physical footprint and 24V coil voltage match.
What are the symptoms of a failing RLY3346 power relay?
Common indicators include a compressor that fails to start despite receiving a 24V signal, audible "chattering" from pitted contacts, or a burnt electrical odor near the control board.
Is this a direct fit for older American Standard units?
As a Service First OEM component, this relay is the standard replacement for various Trane and American Standard models. Always verify your specific model number against the original schematic.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Trane RLY3346 is a heavy-duty 24V 50A DPST-N/O Power Relay designed for high-amperage switching in residential and light commercial HVAC systems. This OEM Trane replacement relay is the direct service match for legacy part numbers CTR0503 and CTR00503, ensuring precise mechanical fit and electrical compatibility without the need for field modifications. Engineered as a double pole single throw component, it simultaneously manages both legs of a 208-230V circuit, making it a critical HVAC contactor relay for controlling high-inductive loads such as compressors, condenser fan motors, and electric heating elements.
With a 50-amp switching capacity at 277 VAC, the RLY3346 power relay provides superior arc suppression compared to universal alternatives, significantly reducing contact pitting and extending the service life of the equipment. The 24VAC control coil is optimized for standard HVAC control circuits, delivering reliable engagement in demanding environments. This genuine Trane part maintains factory-spec safety standards, providing the robust performance required for high-tonnage heat pumps and air handlers.
Key Benefits- OEM Compatibility: Professional-grade direct replacement for CTR0503 and CTR00503, preserving system integrity.
- High-Amperage Rating: Rated for 50A to handle heavy start-up loads of compressors and large motors.
- DPST Configuration: Features two normally open contacts to switch both power legs in 230V applications.
- Verified Performance: Built to withstand industrial-level cycling in Trane and American Standard units.
Can the RLY3346 replace a lower-rated 30A or 40A relay?
Yes, the 50A rating of the RLY3346 offers increased overhead and durability for systems originally equipped with lower-amperage components, provided the physical footprint and 24V coil voltage match.
What are the symptoms of a failing RLY3346 power relay?
Common indicators include a compressor that fails to start despite receiving a 24V signal, audible "chattering" from pitted contacts, or a burnt electrical odor near the control board.
Is this a direct fit for older American Standard units?
As a Service First OEM component, this relay is the standard replacement for various Trane and American Standard models. Always verify your specific model number against the original schematic.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
