Littelfuse LLC643F26M, LLC6 Series, Liquid Level Controller Low Level SPDT, 120VAC, Plug-in Socket, 3s Fixed
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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.
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.
Pre-order 6-8 Weeks
| Control | |
| Type | ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling |
| Sense Voltage | 12VAC nominal at probe terminals |
| Sense Resistance | Fixed 5K - 250KΩ |
| Sense Resistance Tolerance | Fixed ±10% |
| Time Delay | |
| Range | 1 - 60s in 1s increments |
| Tolerance | ±20% |
| Repeat Accuracy | ±10% |
| Time Delay vs Temp. & Voltage | ±10% |
| Power Outage Reset Delay | ≤ 1s |
| Input | |
| Voltage | 120VAC |
| Tolerance | +10% to -20% |
| AC Line Frequency | 50/60 Hz |
| Output | |
| Type | Electromechanical relay |
| Form | Non-isolated, SPDT |
| Rating |
10A resistive @ 240VAC; 1/4 hp @ 125VAC; 1/2 hp @ 250VAC |
| Protection | |
| Surge | IEEE C62.41-1991 Level A |
| Isolation Voltage | ≥ 2500V RMS between input & output terminals |
| Mechanical | |
| Mounting | Plug-in socket |
| Termination | 11-pin relay type |
| Dimensions (Open Board) |
H 73.9 mm (2.91”) W 60.7 mm (2.39”) D 45.2 mm (1.78”) |
| Environmental | |
| Operating/Storage Temperature | -40° to 60°C / -40° to 80°C |
| Humidity | 95% relative, non-condensing |
| Weight | ≅ 7.3 oz (207 g) |