Protection Relays
Pump Controls and Liquid Level Controls
LLC6 SERIES
Low Level Cutoff Liquid Level Controls
Description
The LLC6 Series is a plug-in, 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 in
input voltages of 24, 120, or 230VAC. LED indicator illuminates
whenever the LLC6’s 10A, SPDT output relay is energized.
Available with automatic/manual reset or a special manual reset
with power outage feature, which auto resets the unit when
power is restored and the water level is acceptable. 24VAC and
120VAC units are recognized as limit switches under UL353
(230VAC units are UL508) and CSA certified under Standard 14.
11-PIN
Operation
Automatic Reset (Reset terminals not connected):
When
liquid rises to the low level cutoff probe, the output relay and
the LED indicator energize. When the liquid falls below low level
cutoff probe, the output relay and the LED indicator de-energize
after a fixed time delay.
Manual Reset (Reset switch connected):
When the liquid
level falls below the low level probe, the output relay and LED
de-energize after a fixed time delay. When the liquid level rises
to the low level probe, the output relay and LED indicator remain
de-energized until the 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 level is
above 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
Normally Closed (NC) reset switch is opened.
Wiring Diagram
PC = Probe
Common
P = Probe
V = Voltage
R = Optional NC
Reset Switch
Connect common
to conductive tank.
Additional probe is
necessary for
non-conductive or
insulated tanks.
N/L2
L1
Metal Tank or use
additional Probe
Features & Benefits
FEATURES
Isolated 12VAC on probe
Industry standard 11-pin
octal plug connection
LED indication
Power outage protection
(see ordering table
for models)
BENEFITS
Prevents electrolysis
Eliminates need for special connectors
Visual indication output relay is energized
Automatically resets the unit when power is
restored and the water level is acceptable
Ordering Information
MODEL
INPUT VOLTAGE
TIME DELAY
(FIXED)
SENSE
RESISTANCE
RESET
LLC6210F10M
LLC6410F10M
LLC643F26M
LLC6610F5P
24VAC
120VAC
120VAC
230VAC
10s
10s
3s
10s
10kΩ
10kΩ
26kΩ
5kΩ
Manual/Automatic
Manual/Automatic
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/llc6
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Pump Controls and Liquid Level Controls
LLC6 SERIES
Accessories
BZ1 Front Panel Mount Kit
Provides an easy method of through-the-panel
mounting of 8- or 11-pin plug-in timers, flashers,
and other controls.
NDS-11 11-pin Socket
11-pin 35mm DIN rail or surface mount. Surface
mounted with two #6 (M 3.5 x 0.6) screws or
snaps onto a 35 mm DIN rail. Uses PSC11 hold-
down clips.
PSC11 Hold-down Clips
Securely mounts plug-in controls in any position.
Provides protection against vibration. Use with
NDS-11 Socket. Sold in pairs.
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
Control
Type
Sense Voltage
Sense Resistance
Sense Resistance Tolerance
Time Delay
Range
Tolerance
Repeat Accuracy
Time Delay vs Temp.
& Voltage
Power Outage Reset Delay
Input
Voltage
Tolerance
24VAC
120 or 230VAC
AC Line Frequency
Output
Type
Form
Rating
Protection
Surge
Isolation Voltage
Mechanical
Mounting
Termination
Dimensions
Environmental
Operating/Storage
Temperature
Humidity
Weight
ON/OFF (single level) resistance sensor with
built-in time delay to prevent rapid cycling
12VAC nominal at probe terminals
Fixed 5K - 250KΩ
Fixed ±10%
1 - 60s in 1s increments
±20%
±10%
±10%
≤ 1s
24, 120, or 230VAC
+20% to -15%
+10% to -20%
50/60 Hz
Electromechanical relay
Non-isolated, SPDT
10A resistive @ 240VAC; 1/4 hp @ 125VAC;
1/2 hp @ 250VAC
IEEE C62.41-1991 Level A
≥ 2500V RMS between input &
output terminals
Plug-in socket
11-pin relay type
H
73.9 mm (2.91”);
W
60.7 mm (2.39”);
D
45.2 mm (1.78”)
-40° to 60°C / -40° to 80°C
95% relative, non-condensing
≅
7.3 oz (207 g)
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/llc6
www.littelfuse.com/
Rev: 1-A-062716
Analogue and Mixed Signal
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