Cut Sheet

© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/
Rev: 1-A-062216
Time Delay Relays
Dedicated - Delay-on-Make
www.littelfuse.com/ksps
Operation (Alternating)
Input voltage must be applied at all times for proper operation.
The operation begins with the output relay de-energized. Closing
S1 enables the next alternating operation. When S1 opens
(trailing edge triggered), the time delay begins. At the end of the
time delay, the output energizes and remains energized until S1
is (re-closed and) re-opened. Then the output relay de-energizes
and remains until S1 opens again. Each time S1 opens the time
delay occurs and the output transfers.
Reset: Removing input voltage resets the output and the time delay.
Operation (Single Shot)
Input voltage must be applied before and during timing. Upon
momentary or maintained closure of the initiate switch, the
output (relay or solid state) energizes and the time delay begins.
At the end of the delay, the output de-energizes. Opening or
re-closing the initiate switch during timing has no effect on the
time delay. Note (for most single shot timers): If the initiate
switch is closed when input voltage is applied, the output
energizes and the time delay begins.
Reset: Reset occurs when the time delay is complete and the
initiate switch is opened. Removing input voltage resets the
time delay and output.
Operation (Trailing Edge Single Shot, Impulse-OFF)
Input voltage must be applied before and during timing. When the
initiate switch S1 opens, the output relay energizes. At the end of
the time delay, the output de-energizes. Re-closing and opening
S1 during timing has no affect on the time delay. The output will
not energize if S1 is open when input voltage is applied.
Reset: Reset occurs when the time delay is complete and S1 is
closed. Removing input voltage resets the time delay and output.
Operation (Inverted Single Shot)
Input voltage must be applied before and during timing. Upon
momentary or maintained closure of the initiate switch S1, the
output relay de-energizes. At the end of the time delay, the
output energizes. Opening or re-closing S1 during timing has no
affect on the time delay. The output will remain de-energized if
S1 is closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and S1 is
open. Removing input voltage resets the time delay and output.
Operation (Interval)
Upon application of input voltage, the time delay begins. The
output (relay or solid state) energizes during the time delay. At
the end of time delay the output de-energizes and remains
de-energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and output.
KSPS SERIES
LEGEND
V = Voltage
R = Reset
T1 = ON Time
T2 = OFF Time
S1 =Initiate Switch
NO = Normally Open Contact
NC = Normally Closed Contact
t = Incomplete Time Delay
TD, TD1, TD2 = Time Delay
C = Count
P = Pulse Duration
= Undefined Time
ALTERNATING RELAY
(TRAILING EDGE FLIP- FLOP)
SINGLE SHOT
(PULSE FORMER)
V = Voltage
S1 = Initiate Switch
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
R = Reset
TRAILING EDGE SINGLE SHOT
(IMPULSE-OFF)
INTERVAL (IMPULSE-ON)
V = Voltage
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
R = Reset
= Undefined
Time
INVERTED SINGLE SHOT