The Grässlin DTAV40 Series Auto Voltage Defrost Timer is applicable to air defrost (compressor shutdown) and electric or hot gas defrost systems where the defrost is terminated by the timer. If the coil is frost free, the timers can also be terminated by temperature or pressure switches before the programmed defrost termination time has been reached. The time termination functions as a fail-safe and terminates the defrost cycle if the temperature or pressure switch fails to do so.

  • Series Overview
  • Model Lineup
  • Specifications
  • Resources

• DTAV40 replaces over 40 competitive models

• Auto-Voltage automatically adjusts for 120-240 VAC

• Mounts in existing enclosures, no tools required

• Box lug terminals

• Defrost times programmable in 15-minute intervals with captive trippers

• UL Type 3R outdoor enclosure (DTAV40IM - UL Type 1 Metallic)

• 40 Amp, 2 HP Rating

• Moisture resistant conformal coated board

• LED indicators for defrost and refrigeration cycles

• Defrost cycles are programmed independently

• "Real-time" clock face for quick, easy and accurate setting

• Min ON/OFF time: 15 minutes

• Max ON/OFF time: 23 hours, 45 minutes

Product Ratings
DTAV40Type 3R Rainproof Plastic No
DDT40Type 3R rainproof indoor/outdoor plastic 
DTAV40IMType 1 MetallicNo
DTAV40VMUL Type 3R outdoor enclosureNo
DTAV40MNone, Mechanism OnlyNo
DTAV40QType 3R Rainproof PlasticYes (7 days)

Enclosures: Type 1 Steel, Type 3R Steel, Type 3R Plastic, Plastic Type 3R with See Through Cover

Switch type: SPST/DPST

Switch rating: 40 Amp resistive, 120-480 VAC

                    40 Amp Tungsten, Inductive or 1000 VA Pilot Duty, 120-277 VAC

                    2 HP (24 FLA) 120 VAC

                    5 HP (28 FLA) 240 VAC single-phase

Power Input: 3 W Maximum

Shipping Weight: Type 1 = 3 lbs. (1.4 kg), Type 3R = 4 lbs. (1.8 kg)



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