TA Series - Lockout HVAC Timer

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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.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Sample capableCompare
TA12D112VDC-40° to 85°C (-40°F to 185°F)No
TA12D212VDC-40° to 85°C (-40°F to 185°F)No
TA24A0.524VAC-40° to 85°C (-40°F to 185°F)No
TA24A324VAC-40° to 85°C (-40°F to 185°F)No
TA24A524VAC-40° to 85°C (-40°F to 185°F)No