Protection Relays
Pump Controls and Liquid Level Controls
LLC8 SERIES
Low Level Cutoff Liquid Level Controls
Description
The LLC8 Series is a low cost, single-probe conductive liquid
level control designed for low liquid level cutoff protection. It
offers a factory fixed time delay of 1 - 60s and is available for
input voltages of 24, 120, or 230VAC. LED indicator illuminates
whenever the LLC8’s isolated, 10A, SPDT output relay is
energized. Sense resistance is fixed from 5K - 250KΩ. Available
with manual/automatic reset or a special manual reset with a
power outage feature that auto resets the unit when power is
restored and the water level is acceptable. 24 and 120VAC units
are UL recognized as limit switches under UL353 (230VAC units
are UL 508) and CSA certified under Standard 14.
Wiring Diagram
V = Voltage
LLCO = Low Level
Probe
G, CP = Ground or
Common
(Reference)
Probe
R = Optional NC
Reset Switch
(not included)
NO = Normally Open
NC = Normally Closed
C = Common or
Transfer Contact
Operation
Automatic Reset (Reset switch not connected):
When liquid
rises to low level cutoff probe, output relay and LED indicator
energize. When liquid falls below the low level cutoff probe,
the output relay and LED indicator de-energize after a fixed
time delay.
Manual Reset (Reset switch connected):
When the liquid
level falls below low level probe, the output relay and LED
de-energize after a fixed time delay. When the liquid level rises
to low level probe, the output relay and LED indicator remain
de-energized until the NC manual reset switch is opened; then
they energize immediately.
Power Outage Manual Reset (Reset switch connected):
A power outage causes the output relay and LED indicator to
de-energize. Upon restoration of power, if the liquid is touching
the low level probe, the output relay and LED indicator will
re-energize. If the liquid level is below the low level probe, the
output relay and LED indicator remain de-energized until the NC
reset switch is opened.
Metal Tank or use
additional Probe
Relay contacts are isolated. Connect common to conductive tank. Additional probe is
necessary for non-conductive or insulated tanks.
Ordering Information
MODEL
INPUT
VOLTAGE
TIME
DELAY
(FIXED)
SENSE
RESISTANCE
RESET
Features & Benefits
FEATURES
Isolated 12VAC probes
Open PCB design
Conformally coated PCB
LED indication
Power outage protection
(see ordering table
for models)
24VAC & 120VAC models
meet UL353
BENEFITS
Prevents scale buildup on probe
Cost effective design for OEM low liquid level
cutoff protection
Protects against moisture and corrosion
Visual indication output relay is energized
Automatically resets the unit when power is
restored and the water level is acceptable
Required for use as a low level limit switch
LLC825F5M
24VAC
LLC842F103M 120VAC
LLC843F10M 120VAC
LLC843F10P
LLC843F26M
LLC843F26P
LLC845F25P
120VAC
120VAC
120VAC
120VAC
5s
2s
3s
3s
3s
3s
5s
30s
30s
10s
3s
5kΩ
10kΩ
10kΩ
10kΩ
26kΩ
26kΩ
25kΩ
250kΩ
26kΩ
12kΩ
26kΩ
LLC8430F250P 120VAC
LLC8430F26P
120VAC
LLC8610F12M 230VAC
LLC863F26P
230VAC
Manual/automatic
Manual/automatic
Manual/automatic
Power outage
manual reset
Manual/automatic
Power outage
manual reset
Power outage
manual reset
Power outage
manual reset
Power outage
manual reset
Manual/automatic
Power outage
manual reset
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/llc8
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Pump Controls and Liquid Level Controls
LLC8 SERIES
Accessories
P1015-13
(AWG 10/12),
P1015-64
(AWG 14/16),
P1015-14
(AWG 18/22)
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.
PHST-38QTN Electrode
Designed for a maximum steam pressure of
240 PSI; 400° F UL353 Recognized.
.
LLP-24 Threaded Probe (24”)
Threaded stainless steel probe measuring 24”
(61 cm) long. For use with PHST-38QTN liquid
level control electrodes.
Specifications
Resistance sensing for conductive liquids with
time delay
Sense Voltage
12VAC nominal at probe terminals
Sense Resistance
Fixed 5K - 250KΩ
Sense Resistance Tolerance
±10%
Time Delay
Tolerance
±20%
Repeat Accuracy
±10%
Time Delay vs Temp.
& Voltage
±10%
Power Outage Reset Delay
≤1s
Input
Voltage
24, 120, or 230VAC
Tolerance
24VAC
-15% - 20%
120 or 230VAC
-20% - 10%
AC Line Frequency
50/60 Hz
Output
Type
Electromechanical relay
Form
Isolated SPDT
Rating
10A resistive @ 120/240VAC;
1/4 hp @ 125VAC; 1/2 hp @ 250VAC
Protection
Surge
IEEE C62.41-1991 Level A
Isolation Voltage
≥ 2500V RMS input to output terminals
Mechanical
Mounting
0.5 in. (12.7 mm) x .187 (4.76 mm) dia. nylon
standoffs (3)
Termination
Dimensions
H
63.5 mm (2.5”);
W
55.6 mm (2.19”);
D
47.8 mm (1.88”)
Electrical
0.25 in. (6.35 mm) male quick connect terminals
Reset Switch & Probe(s)
0.187 x 0.03 in. (4.75 x 0.76 mm) male quick
connect terminals
Environmental
Operating/Storage
Temperature
-40° to 60°C / -40° to 80°C
Coating
Printed circuit board is conformal coated to
resist moisture & corrosion
Humidity
95% relative, non-condensing
Weight
≅
5 oz (141.7 g)
Control
Type
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/llc8
www.littelfuse.com/
Rev: 1-A-062716
MCU
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