Mars mars-33244 Thermal Time Delay Relay Sequencer

Product Description

The MARS mars-33244 is a thermal time delay relay sequencer designed for use in HVAC systems where staged sequencing of heating or cooling components is required. It provides a 1 to 24 second ON delay and a 45 to 75 second OFF delay, with a DPST normally open contact configuration. This type of sequencer controls the order in which electric heating elements, blower motors, or other load circuits energize and de-energize, protecting system components from simultaneous inrush loads. Licensed HVAC technicians install this relay as part of electric furnace, heat pump, or air handler control circuits.

The mars-33244 is suited for residential and light commercial HVAC applications where electric resistance heat or multi-stage system sequencing is required. It is a common replacement component in electric furnaces and air handlers, managing timed activation and shutdown of heat strips or blower circuits to reduce electrical stress on contactors and wiring. The adjustable ON and OFF delay ranges allow the technician to tune sequencing intervals to the specific system requirements.

Key Features

• ON delay range of 1 to 24 seconds for staged startup sequencing
• OFF delay range of 45 to 75 seconds for controlled shutdown sequencing
• DPST normally open contact configuration
• Thermal actuation mechanism for reliable time delay operation
• Compact relay form factor suitable for electric furnace and air handler control panels

Compatibility

Designed as an OEM-style replacement thermal time delay relay sequencer for residential and light commercial electric furnaces and air handlers requiring DPST normally open contact sequencing.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all electrical power to the unit before removing or installing the sequencer. Verify that system voltage and load ratings are within the relay specifications before completing the circuit. Follow all applicable NEC requirements for low-voltage and line-voltage control wiring in heating equipment.

Technical Specifications

• ON Delay Setting: 1 to 24 seconds
• OFF Delay Setting: 45 to 75 seconds
• Contact Configuration: DPST Normally Open (N.O.)
• Relay Type: Thermal Time Delay
• UNSPSC Code: 39121604
• UPC: 685744332442

Standard Information

• Brand: MARS
• Manufacturer Part Number: mars-33244