Lennox 45H03 Relay
The Lennox 45H03 is a heavy-duty DPDT (Double Pole Double Throw) relay manufactured by Deltrol Controls, specifically designed for high-amperage HVACR switching applications. This 275TM series relay operates on a 24VAC coil and is engineered to manage inductive loads in commercial air handlers, condensers, and refrigeration systems. Its robust contact design ensures reliable circuit isolation and motor starting capabilities, making it a direct OEM replacement for aging or pitted contactors in Lennox equipment. The 275 series is known for its high dielectric strength and mechanical life, providing stable switching for fan motors, compressors, and heating elements. When troubleshooting interlocking circuits or multi-stage systems, the 45H03 relay offers the versatility required for complex control logic. Proper installation requires verifying 24V signal integrity to prevent coil chatter and ensuring terminal connections are torqued correctly to mitigate resistive heating during peak draw.
Technical Benefits
- DPDT configuration allows for simultaneous control of two independent circuits.
- High-capacity 275TM frame handles higher inrush currents without contact welding.
- Standard 24V AC coil compatible with most low-voltage HVAC control boards and transformers.
- Compact footprint facilitates easy integration into crowded electrical control boxes.
- Durable Deltrol construction provides superior resistance to vibration and mechanical wear.
Common Technical Inquiries
Can I use the Lennox 45H03 to replace a SPDT relay?
Yes, the DPDT configuration can function as a Single Pole Double Throw (SPDT) or Single Pole Single Throw (SPST) by utilizing only the necessary poles, provided the electrical ratings match your load requirements.
What are the contact ratings for the Deltrol 275TM series?
These relays are typically rated for 30A to 40A depending on the voltage and whether the load is resistive or inductive. Always consult the specific wiring schematic for your blower or compressor circuit.
What causes this relay to hum or chatter during operation?
Chattering is usually indicative of low voltage at the coil (less than 20.4VAC) or a failing transformer. Check for loose 24V common connections or high resistance in the thermostat wire.
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: $61.22
-65%$61.22
$21.43Lennox 45H03 Relay
The Lennox 45H03 is a heavy-duty DPDT (Double Pole Double Throw) relay manufactured by Deltrol Controls, specifically designed for high-amperage HVACR switching applications. This 275TM series relay operates on a 24VAC coil and is engineered to manage inductive loads in commercial air handlers, condensers, and refrigeration systems. Its robust contact design ensures reliable circuit isolation and motor starting capabilities, making it a direct OEM replacement for aging or pitted contactors in Lennox equipment. The 275 series is known for its high dielectric strength and mechanical life, providing stable switching for fan motors, compressors, and heating elements. When troubleshooting interlocking circuits or multi-stage systems, the 45H03 relay offers the versatility required for complex control logic. Proper installation requires verifying 24V signal integrity to prevent coil chatter and ensuring terminal connections are torqued correctly to mitigate resistive heating during peak draw.
Technical Benefits
- DPDT configuration allows for simultaneous control of two independent circuits.
- High-capacity 275TM frame handles higher inrush currents without contact welding.
- Standard 24V AC coil compatible with most low-voltage HVAC control boards and transformers.
- Compact footprint facilitates easy integration into crowded electrical control boxes.
- Durable Deltrol construction provides superior resistance to vibration and mechanical wear.
Common Technical Inquiries
Can I use the Lennox 45H03 to replace a SPDT relay?
Yes, the DPDT configuration can function as a Single Pole Double Throw (SPDT) or Single Pole Single Throw (SPST) by utilizing only the necessary poles, provided the electrical ratings match your load requirements.
What are the contact ratings for the Deltrol 275TM series?
These relays are typically rated for 30A to 40A depending on the voltage and whether the load is resistive or inductive. Always consult the specific wiring schematic for your blower or compressor circuit.
What causes this relay to hum or chatter during operation?
Chattering is usually indicative of low voltage at the coil (less than 20.4VAC) or a failing transformer. Check for loose 24V common connections or high resistance in the thermostat wire.
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
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Shipping & Returns
Description
The Lennox 45H03 is a heavy-duty DPDT (Double Pole Double Throw) relay manufactured by Deltrol Controls, specifically designed for high-amperage HVACR switching applications. This 275TM series relay operates on a 24VAC coil and is engineered to manage inductive loads in commercial air handlers, condensers, and refrigeration systems. Its robust contact design ensures reliable circuit isolation and motor starting capabilities, making it a direct OEM replacement for aging or pitted contactors in Lennox equipment. The 275 series is known for its high dielectric strength and mechanical life, providing stable switching for fan motors, compressors, and heating elements. When troubleshooting interlocking circuits or multi-stage systems, the 45H03 relay offers the versatility required for complex control logic. Proper installation requires verifying 24V signal integrity to prevent coil chatter and ensuring terminal connections are torqued correctly to mitigate resistive heating during peak draw.
Technical Benefits
- DPDT configuration allows for simultaneous control of two independent circuits.
- High-capacity 275TM frame handles higher inrush currents without contact welding.
- Standard 24V AC coil compatible with most low-voltage HVAC control boards and transformers.
- Compact footprint facilitates easy integration into crowded electrical control boxes.
- Durable Deltrol construction provides superior resistance to vibration and mechanical wear.
Common Technical Inquiries
Can I use the Lennox 45H03 to replace a SPDT relay?
Yes, the DPDT configuration can function as a Single Pole Double Throw (SPDT) or Single Pole Single Throw (SPST) by utilizing only the necessary poles, provided the electrical ratings match your load requirements.
What are the contact ratings for the Deltrol 275TM series?
These relays are typically rated for 30A to 40A depending on the voltage and whether the load is resistive or inductive. Always consult the specific wiring schematic for your blower or compressor circuit.
What causes this relay to hum or chatter during operation?
Chattering is usually indicative of low voltage at the coil (less than 20.4VAC) or a failing transformer. Check for loose 24V common connections or high resistance in the thermostat wire.
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.
