111P Series - Single-Phase Pump Monitor

Series: 111P
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Disclaimer Notice

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 Littelfuse Models 111P (115 volt, 1/3 to 1hp); 233P-1.5 (230 volt, 1/3 to 1.5hp); and 233P (230 volt, 1/3 to 3hp) protect pumps from dry-well, dead-head, jammed impeller, overvoltage/ undervoltage conditions and now rapid-cycle protection whether the pressure switch is mounted before or after our unit.

A calibration adjustment allows the Insider to be calibrated to your specific pumping applications, thereby reducing the possibility of false or nuisance tripping. A unique microcontroller based voltage and current-sensing circuit constantly monitors the incoming power for fluctuations, overcurrent, and undercurrent. When an abnormality, such as loss of suction is detected, the product deactivates its output relay and directly disconnects the pump motor. The relay then begins its user selectable restart delay (dry-well recovery) timer. When the timer counts to zero or power is removed and reapplied, the relay reactivates its output relay and turns the pump back on.

The relay communicates with a hand-held diagnostics tool called the Informer (sold separately). The Informer displays parameters including calibration points, trip points, run time and last faults.

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Input Load Range (hp)Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)Overcurrent Trip ClassInput AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Overvoltage Trip Voltage (%)Rapid Cycle Timer (s)Restart Delay RangeTrip Delay RangeStockSamplesCompare
111P115 Vac1/3 - 1SPSTTorque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG#8 screws2.93 H x 5.25 W x 2.91 D in. (73.7 x 133.4 x 74 mm)0 Kg125% of calibration point50 / 60 (50 will increase all delay timers by 20%)51 hp @ 120 Vac (16 A max.)132.5 Vac4 restarts allowed in 60 s periodOver/Under Voltage: 2 s; All other faults: Manual; 2 - 225 mOvercurrent: 5 s; Dry-well: 4 sCheckOrder
111P-ENCL115 Vac1/3 - 1SPSTTorque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG#8 screws8.3 H x 5.36 W x 3.68 D in. (210.8 x 136.1 x 93.5 mm)0 Kg125% of calibration point50 / 60 (50 will increase all delay timers by 20%)51 hp @ 120 Vac (16 A max.)132.5 Vac4 restarts allowed in 60 s periodOver/Under Voltage: 2 s; All other faults: Manual; 2 - 225 mOvercurrent: 5 s; Dry-well: 4 sCheckOrder
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