TA24A3 - TA Series

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Littelfuse HVAC Relays
The TA Series prevents rapid recycling of a compressor. A lockout delay is started when the thermostat opens, or input voltage is lost. Eliminates tripped circuit breakers or blown fuses caused by a locked rotor during short cycling. The TA will not allow the compressor to start when the line voltage is low. Chatter of the compressor relay is eliminated. Because of the fast initiate time, bounce of the thermostat will not be transmitted to the compressor relay coil. A 30 second delay provides anti-reversing protection for scroll compressors.


Operation (Lockout)
On initial closure of the S1, the compressor relay energizes immediately. When S1 opens or input voltage is interrupted, a lockout time delay is initiated. During this lockout time delay, the compressor relay cannot be energized. The low voltage (brownout) protection prevents energization of the compressor when the line voltage is low.
Reset: The lockout time delay cannot be reset. After the time delay is completed, the unit automatically resets.

Property (Mouseover for details) Value
Input Voltage (V) 24VAC
Input AC Line Frequency (Hz) 50/60Hz
Input Impedance (Ohms) 450 Ω (anticipator by-pass)
Output Load Rating (VA) 1A at 60°C
Minimum Output Load Current (A) 75mA
Output Voltage Drop (V) ≤1.25V
Time Delay Tolerance (%) -15% - 35%
Lockout and Random Start Delays 3m fixed
Initiate Time (ms) ≌16ms
Thermostat Anticipator Resistor (Ohms) Cooling anticipator resistor: ≥1800Ω
Undervoltage Trip Voltage ≅20V
Insulation Resistance ≥100 MΩ
Dielectric Breakdown ≥2000V RMS terminals to mounting surface
Circuitry Encapsulated
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with one #10 (M5 x 0.8) screw
Operating Temperature -40° to 70°C (-40°F to 158°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Dimensions 2.00 x 2.00 x 1.21 in. (50.8 x 50.8 x 30.7mm)
Weight (lbs/g) ≅2.4oz (68g)
Sample capable No