235P Series - Littelfuse 235P Pump Monitors Provide Exceptional System Protection

Series: 235P
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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 235P is designed to protect 5-15 hp, 230 V, single-phase pumps from dry-well, dead-head, jammed impellers, rapid-cycle, and overvoltage and undervoltage conditions. A calibration adjustment allows the 235P to be calibrated to your specific pumping applications, reducing the possibility of false or nuisance tripping. A unique microcontroller-based voltage and current-sensing circuit constantly monitors the incoming power for fluctuations causing overcurrent and undercurrent. When an abnormality such as loss of suction is detected, the 235P deactivates its output relay and directly disconnects the pump motor. The 235P 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. An external current transformer is required for operation (sold separately).

Special considerations for pump cables larger than #10 AWG: In some cases where larger motors are installed with deep-set pumps, pump cables are used that exceed the relay’s terminal size. In these conditions, a short splice of #10 AWG or #12 AWG may be a solution at the control box. Note: All local, state, and national electric codes should be followed when applying this solution.

NOTE: The 235P model has a sensitivity adjustment for the dry-well trip point. After calibration is done, you can adjust the sensitivity for the dry-well/dead-head trip point from 70-90 % of the full load. This makes the unit even more adaptable to varying pumping applications. If you have a very low producing well, increase the sensitivity closer to the 90 % mark, or if you have a very heavy producing well, decrease the sensitivity around the 70 % mark.

Features

  • Proprietary microcontroller-based circuitry
  • Onboard sensitivity adjustment
  • Adjustable restart delay
  • Built-in IR communications link
  • LED indication

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
235P230 Vac5 - 15 (external current transformer required)SPSTTorque: 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%)5A300; 720 VA @ 240 Vac (10 A max.)265 Vac4 restarts allowed in 60 s periodOver/Under Voltage: 2 s; All other faults: Manual; 2 - 225 mOvercurrent: 5 s; Dry-well: 4 sCheckOrder
235P-ENCL230 Vac5 - 15 (external current transformer required)SPSTTorque: 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%)5A300; 720 VA @ 240 Vac (10 A max.)265 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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