© 2016 Littelfuse Protection Relays & Controls
Time Delay Relays
Dedicated - Single Shot
Rev: 1-A-062216
www.littelfuse.com/thc-ths
THC / THS SERIES
Wiring Diagram
Description
The THC/THS Series is a solid-state relay and timer combined
into one compact, easy-to-use control. When mounted to a
metal surface, the THC/THS Series may be used to directly
control lamp or heater loads of up to 20A steady, 200A inrush.
Its single shot function can perform dispensing and pulse
shaping operations. The initiate switch can be a momentary or
maintained type of switch. Time delays can be selected from 0.1
- 600 seconds in 4 ranges. The THC/THS Series is used for coin
vending applications where fast initiate response is required.
Operation (Single Shot)
Input voltage must be applied before and during timing. Upon
momentary or maintained closure of the initiate switch (leading
edge triggered), the output energizes for a measured interval of
time. At the end of the delay, the output de-energizes. Opening
or reclosing the initiate switch during timing has no affect on
the time delay. The output will energize if the initiate switch is
closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and the
initiate switch opens. Loss of input voltage resets the time delay
and output.
Features & Benefits
FEATURES BENEFITS
Analog circuitry
Repeat accuracy + / - 2%,
Factory calibration + / - 5%
Compact, low
cost design
Allows flexiblility for OEM applications and reduces
labor and component costs
High load currents up to
20A, 200A inrush
Allows direct operation of motors, lamps, and
heaters directly without a contactor
Totally solid state
and encapsulated
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Metalized
mounting surface
Facilitates heat transfer in high current applications
Accessories
P1004-95, P1004-95-X Versa-Pot
Panel mountable, industrial potentiometer
recommended for remote time delay adjustment.
P0700-7 Versa-Knob
Designed for 0.25 in (6.35 mm) shaft of
Versa-Pot. Semi-gloss industrial black finish.
P1015-13 (AWG 10/12), 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.
L1 N/L2
V = Voltage
S1 = Initiate Switch
L = Timed Load
UTL = Optional Untimed
Load
R
T
is used when external
adjustment is ordered.
Ordering Information
MODEL
INPUT
VOLTAGE
ADJUSTMENT TIME DELAY
OUTPUT
RATING
THC421C
120VAC
External 0.1 - 3s 20A
THS422B 120VAC External 0.5 - 60s 10A
THS422C 120VAC External 0.5 - 60s 20A
If you don’t find the part you need, call us for a custom product 800-843-8848
