Supco td73 Time Delay on Break Timer 19-250V 1A

Product Description

The SUPCO td73 is a time delay on break (DOB) timer designed for HVAC control circuits that require a timed delay after power is removed from the load circuit. The td73 operates across a wide input voltage range of 19 to 250 volts AC or DC, making it suitable for both low-voltage and line-voltage control applications. It supports a maximum continuous load of 1 amp with an inrush tolerance of 10 amps, and requires a minimum load current of 40 milliamps at 24 VAC. Licensed HVAC technicians and controls specialists typically install this timer as part of equipment sequencing or compressor protection logic.

The td73 fits residential and light commercial HVAC applications where a controlled off-delay is needed to protect compressors, motors, or other equipment from rapid restart cycles. Its wide voltage compatibility makes it useful across a range of system configurations, including those operating at standard 24-volt control voltage as well as higher-voltage circuits. It is well suited for integration into control panels, air handlers, and packaged HVAC units requiring DOB timing sequences.

Key Features

• Wide input voltage range: 19 to 250 volts AC or DC
• Maximum load current: 1 amp continuous with 10-amp inrush tolerance
• Minimum load current: 40 milliamps at 24 VAC
• Operating temperature range: 0 to 160 degrees F (-18 to 71 degrees C)
• Non-positional, single-hole mounting for flexible panel installation
• 1/4-inch quick connect terminals for fast field wiring

Compatibility

Designed as an OEM-style replacement or upgrade timer for residential and light commercial HVAC control circuits requiring time delay on break functionality across 19 to 250 volt AC/DC systems.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed controls technician. Disconnect and lock out all power to the control circuit before removing the existing timer or making any wiring connections. The single-hole non-positional mounting design allows the unit to be secured in any orientation, providing flexibility in panel layout. Verify that load current meets the 40-milliamp minimum requirement at 24 VAC before commissioning.

Technical Specifications

• Input Voltage: 19-250 VAC/VDC
• Maximum Load Current: 1 amp
• Maximum Inrush Current: 10 amps
• Minimum Load Current: 40 milliamps at 24 VAC
• Operating Temperature: 0 to 160 degrees F (-18 to 71 degrees C)
• Mounting Type: Non-positional, single hole
• Connection: 1/4-inch quick connect terminals

Standard Information

• Brand: SUPCO
• Manufacturer Part Number: td73