111P - 111P Series

Series: 111P Questions? Contact Littelfuse Support
littelfuse Motor and Pump Protection Relays
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 microcontrollerbased 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 userselectable 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.

Property (Mouseover for details) Value
Input Voltage (V) 115VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz (50Hz will increase all delay timers by 20%.)
Input Load Range (hp) 1/3 - 1 hp
Output Form SPST
Output Load Rating (VA) 1 hp @ 120VAC (16 amps max.)
Rapid Cycle Timer (s) 4 restarts allowed in 60s period
Restart Delay Range Over/Undervoltage: 2s; All other faults: Manual 2 - 225m
Trip Delay Range Overcurrent: 5s; Dry-well: 4s
Overvoltage Trip Voltage (%) 132.5VAC
Undervoltage Reset Voltage (%) 95VAC
Overcurrent Trip Class 125% of calibration point
Underload (%) Adjustable (70 to 90% of calibrated run power)
Termination Type Torque: 13 in-lbs; Wire: Stranded or solid 10-22AWG
Mounting Method #8 screws
Operating Temperature -40° to 55°C (-40° to 131°F)
Dimensions 2.93î H x 5.25î W x 2.91î D (73.7 x 133.4 x 74.0 mm)
Weight (lbs/g) 0.88 lbs (14 oz. 396.9g)