MARS 33242 Relay

The MARS 33242 Relay is a specialized 24V SPST-NO time delay relay engineered for precise control in HVACR systems. As a veteran-grade HVAC compressor time delay solution, this component utilizes a solid-state PTC (Positive Temperature Coefficient) device. When current flows through the control circuit, the PTC element heats an internal snap-acting disc, facilitating a reliable make-or-break contact transition. This thermal time delay relay is designed to mitigate short-cycling, protecting high-torque motors and compressors from premature wear during power fluctuations or rapid thermostat cycling.

Designed for universal mounting, this SPST normally open relay is shock and vibration resistant, making it a staple for field repairs in air conditioning units, heat pump systems, and commercial refrigeration. The MARS 33242 features an automatic reset mechanism and is voltage/ambient compensated to ensure consistent switching intervals across varying mechanical environments. With a 25A rating and multi-application versatility, it serves as a direct replacement for various OEM sequencers and delays in electric heat and gas furnace configurations.

• Anti-Short Cycle Protection: Prevents rapid compressor restarts, extending equipment life and reducing field callbacks.
• Proven Durability: Solid-state PTC design with snap-acting disc technology ensures positive make/break action under industrial conditions.
• Universal Application: Compatible with 24V control circuits found in furnaces, unit heaters, and 240V air conditioning systems.
• Field Reliability: Shock and vibration resistant housing allows for non-positional mounting in tight control cabinets.

What is the delay timing for the MARS 33242?
This relay typically provides a delay of 30 to 75 seconds on make and 1 to 40 seconds on break, though timing may vary slightly based on ambient temperature and voltage stability.

Can this relay replace a standard sequencer?
Yes, the MARS 33242 is often used as a time delay sequencer for electric heat and blower motor lead-lag control where a 24V SPST-NO configuration is required.

Is this unit orientation-sensitive?
No, the internal snap-action mechanism is non-positional, allowing the technician to mount the relay in any orientation required by the specific HVAC cabinet layout.

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.