© 2016 Littelfuse Protection Relays & Controls

www.littelfuse.com/

Rev: 1-A-062716

Protection Relays

Pump Controls and Liquid Level Controls

www.littelfuse.com/llc8

LLC8 SERIES

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.

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.

Features & Benefits

FEATURES

BENEFITS

Isolated 12VAC probes

Prevents scale buildup on probe

Open PCB design

Cost effective design for OEM low liquid level

cutoff protection

Conformally coated PCB

Protects against moisture and corrosion

LED indication

Visual indication output relay is energized

Power outage protection

(see ordering table

for models)

Automatically resets the unit when power is

restored and the water level is acceptable

24VAC & 120VAC models

meet UL353

Required for use as a low level limit switch

Wiring Diagram

Low Level Cutoff Liquid Level Controls

Ordering Information

MODEL

INPUT

VOLTAGE

TIME

DELAY

(FIXED)

SENSE

RESISTANCE RESET

LLC825F5M

24VAC

5s

5kΩ

Manual/automatic

LLC842F103M 120VAC

2s

10kΩ

Manual/automatic

LLC843F10M

120VAC

3s

10kΩ

Manual/automatic

LLC843F10P

120VAC

3s

10kΩ

Power outage

manual reset

LLC843F26M

120VAC

3s

26kΩ

Manual/automatic

LLC843F26P

120VAC

3s

26kΩ

Power outage

manual reset

LLC845F25P

120VAC

5s

25kΩ

Power outage

manual reset

LLC8430F250P 120VAC

30s

250kΩ

Power outage

manual reset

LLC8430F26P

120VAC

30s

26kΩ

Power outage

manual reset

LLC8610F12M 230VAC

10s

12kΩ

Manual/automatic

LLC863F26P

230VAC

3s

26kΩ

Power outage

manual reset

If you don’t find the part you need, call us for a custom product 800-843-8848

Metal Tank or use

additional Probe

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

Relay contacts are isolated. Connect common to conductive tank. Additional probe is

necessary for non-conductive or insulated tanks.