Time Delay Relays

Dedicated - HVAC

www.littelfuse.com/ta

Rev: 1-A-062316

TA SERIES

Lockout

Wiring Diagram

Description

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.

Features & Beneﬁts

FEATURES BENEFITS

Lockout delay

Prevents rapid cycling of compressor and eliminates

nuisance service calls due to blown fuse or tripped

breaker by locked rotor during short cycling

Anti-reversing protection

for scroll compressors

Extends life of equipment

Brownout protection

Timer will not allow the compressor to start during

low line voltage conditions

Encapsulated Protects against shock, vibration, and humidity

1A solid state output

No moving parts to arc and wear out. Provides up to

100 million operations under typical conditions

Accessories

P1023-6 Mounting bracket

The 90° orientation of mounting slots makes

installation/removal of modules quick and easy.

P1015-64 (AWG 14/16)

Female Quick Connect

These 0.25 in. (6.35 mm) female terminals are

constructed with an insulator barrel to provide

strain relief.

P1015-18 Quick Connect to Screw Adapter

Screw adapter terminal designed for use with

all modules with 0.25 in. (6.35 mm) male quick

connect terminals.

C103PM (AL) DIN Rail

35 mm aluminum DIN rail available in a 36 in.

(91.4 cm) length.

P1023-20 DIN Rail Adapter

Allows module to be mounted on a 35 mm DIN

type rail with two #10 screws.

Ordering Information

MODEL INPUT VOLTAGE TIME DELAY

TA12D1

12VDC

TA12D2

12VDC

TA24A0.5

24VAC

30s

TA24A3

24VAC

TA24A5

24VAC

If you don’t ﬁnd the part you need, call us for a custom product 800-843-8848

L1 N

V = Voltage

S1 = Initiate Switch,

Contact, or

Thermostat

CR = Compressor Relay

(Load)

CA = Optional Cooling

Anticipator

Time Delay Relays

Dedicated - HVAC

www.littelfuse.com/ta

Rev: 1-A-062316

TA SERIES

Speciﬁcations

Input

Voltage 12 or 24VDC; 24VAC

AC Line Frequency 50/60 Hz

Impedance 450 Ω (anticipator by-pass)

Output

Minimum Load Current 75mA

Maximum Load Current 1A at 60°C

Voltage Drop ≤ 1.25V

Time Delay

Initiate Time ≅ 16ms

Lockout Time Fixed 0.5, 1, 2, 3, or 5m

Tolerance -15% - 35%

Protection

Circuitry Encapsulated

Low Voltage Protection ≅ 20V: 24VAC/DC; ≅ 9V: 12VDC

Dielectric Breakdown ≥ 2000V RMS terminals to mounting surface

Insulation Resistance ≥ 100 MΩ

Mechanical

Mounting Surface mount with one #10 (M5 x 0.8) screw

Dimensions H 50.8 mm (2”); W 50.8 mm (2”);

D 30.7 mm (1.21”)

Termination 0.25 in. (6.35 mm) male quick connect terminals

Environmental

Operating/Storage

Temperature -40° to 70°C / -40° to 85°C

Humidity 95% relative, non-condensing

Weight ≅ 2.4 oz (68 g)

Thermostat

Cooling Anticipator Resistor ≥ 1800 Ω

Function Diagram

LOCKOUT

V = Voltage

S1 = Initiate Switch

L = Load (CR)

E = Ready

TD = Time Delay

R = Reset