Name: LLC4 Series – Liquid Level Controller Series - Littelfuse LLC4 Liquid Level Controller Provides Superior Protection
Brand: Littelfuse Inc.

LLC4 Series – Liquid Level Controller Series - Littelfuse LLC4 Liquid Level Controller Provides Superior Protection

Series: LLC4 Series – Liquid Level Controller

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The LLC4 series combines resistance-sensing circuitry with solid-state timing to provide single-probe level maintenance. On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and floating debris. Isolated 12 V ac is provided at the probe to prevent electrolysis. A trickle current of less than 1 mA determines the presence or absence of conductive liquid between the probe and common. The LLC4 series can be used with many types of low voltage (resistance changing) transducers to perform other control functions like temperature limit control, photo limit control, condensation sensing, and ice sensing. This unit features an industry standard, eight-pin octal plug connection.

Operation

Drain (pump-down mode): When the liquid level rises and touches the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energizes and remains energized until the liquid level falls below the probe level. The output relay de-energizes and remains de-energized until the liquid rises and touches the probe.

Fill (pump-up mode): When the liquid level falls below the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energizes and remains energized until the liquid level rises and touches the probe. The output relay then de-energizes and remains de-energized until the liquid level again falls below the probe level.

Features

Isolated 12 V ac voltage on probes
Industry standard 8-pin octal plug connection
Sensitivity adjustment

Access specifications, certifications, check availability and order parts below

Catalog #	Input Voltage (V)	Output Form	Time Delay Range	Termination Type	Mounting Method	Dimensions	Weight (lbs/g)	Control Type	Input AC Line Frequency (Hz)	Input Tolerance (%)	Output Load Rating (VA)	Output Type	Sense Resistance Tolerance	Sense Resistance (Ohms)	Sense Voltage	Stock	Samples

LLC42A10A	24 Vac	Isolated SPDT	10 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.35	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC42A1A	24 Vac	Isolated SPDT	1 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.35	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC42B15A	24 Vac	Isolated SPDT	15 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.35	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A10A	120 Vac	Isolated SPDT	10 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A15A	120VAC	Isolated SPDT	15s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 x 2.39 x 1.78 in. (73.9 x 60.7 x 45.2mm)	≅6.0oz (170g)	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling		-0.3	4A resistive @ 240VAC and 28VDC; 1/10hp @ 240VAC	Electromechanical relay	1K ±500 Ω at low end; 250K ±25% at high end	Adjustable to 250kΩ	12VAC at probe terminals
LLC44A1A	120 Vac	Isolated SPDT	1 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A2A	120 Vac	Isolated SPDT	2 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A4A	120 Vac	Isolated SPDT	4 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A5A	120 Vac	Isolated SPDT	5 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44A60A	120 Vac	Isolated SPDT	60 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B1A	120 Vac	Isolated SPDT	1 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B20A	120 Vac	Isolated SPDT	20 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B2A	120 Vac	Isolated SPDT	2 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B30A	120 Vac	Isolated SPDT	30 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B4A	120 Vac	Isolated SPDT	4 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B5A	120 Vac	Isolated SPDT	5 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	1 kΩ ±500; at low end; 250 kΩ ±25% at high end	Adjustable to 250	12 Vac at probe terminals	Check	Order
LLC44B5F100	120 Vac	Isolated SPDT	5 s fixed	Octal 8-pin plug-in	Plug-in socket	2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)	0 Kg	ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling	50 / 60	-0.3	4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 Vac	Electromechanical relay	±10% or 500 Ω whichever is greater	100 fixed	12 Vac at probe terminals	Check	Order

To request product environmental information, please complete the Product Environmental Information Request Form.

	LLC4 Datasheet
	Protection Relays and Controls Catalog
	Protection Relays and Controls Catalog - Spanish
	Protection Relays and Controls Catalog - Mandarin
	LLC4 CAD DWG
	LLC4 3D Model STP
	LLC4 2D Print PDF

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LLC4 Series – Liquid Level Controller Series - Littelfuse LLC4 Liquid Level Controller Provides Superior Protection

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