Time Delay Relays
Dedicated - HVAC
TA SERIES
Lockout
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.
N
Wiring Diagram
L1
Features & Benefits
FEATURES
V = Voltage
S1 = Initiate Switch,
Contact, or
Thermostat
CR = Compressor Relay
(Load)
CA = Optional Cooling
Anticipator
BENEFITS
Prevents rapid cycling of compressor and eliminates
nuisance service calls due to blown fuse or tripped
breaker by locked rotor during short cycling
Extends life of equipment
Timer will not allow the compressor to start during
low line voltage conditions
Protects against shock, vibration, and humidity
No moving parts to arc and wear out. Provides up to
100 million operations under typical conditions
Lockout delay
Anti-reversing protection
for scroll compressors
Brownout protection
Encapsulated
1A solid state output
Accessories
P1023-6 Mounting bracket
The 90° orientation of mounting slots makes
installation/removal of modules quick and easy.
Ordering Information
MODEL
INPUT VOLTAGE
TIME DELAY
TA12D1
TA12D2
TA24A0.5
TA24A3
TA24A5
12VDC
12VDC
24VAC
24VAC
24VAC
1m
2m
30s
3m
5m
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.
Rev: 1-A-062316
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/ta
Time Delay Relays
Dedicated - HVAC
TA SERIES
Specifications
Input
Voltage
AC Line Frequency
Impedance
Output
Minimum Load Current
Maximum Load Current
Voltage Drop
Time Delay
Initiate Time
Lockout Time
Tolerance
Protection
Circuitry
Low Voltage Protection
Dielectric Breakdown
Insulation Resistance
12 or 24VDC; 24VAC
50/60 Hz
450 Ω (anticipator by-pass)
75mA
1A at 60°C
≤ 1.25V
≅
16ms
Fixed 0.5, 1, 2, 3, or 5m
-15% - 35%
Encapsulated
≅
20V: 24VAC/DC;
≅
9V: 12VDC
≥ 2000V RMS terminals to mounting surface
≥ 100 MΩ
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Humidity
Weight
Thermostat
Cooling Anticipator Resistor
Surface mount with one #10 (M5 x 0.8) screw
H
50.8 mm (2”);
W
50.8 mm (2”);
D
30.7 mm (1.21”)
0.25 in. (6.35 mm) male quick connect terminals
-40° to 70°C / -40° to 85°C
95% relative, non-condensing
≅
2.4 oz (68 g)
≥ 1800 Ω
Function Diagram
LOCKOUT
E
L
V = Voltage
S1 = Initiate Switch
L = Load (CR)
E = Ready
TD = Time Delay
R = Reset
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/ta
Rev: 1-A-062316
