234-P Series - Single-Phase Pump Protection

234-P Series - Littelfuse 234-P PumpSaver® Provides Exceptional System Protection

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 PumpSaver® Plus Model 234-P protects single-phase pumps from dry-well, dead-head, rapid-cycle, jammed impellers, and over/undervoltage conditions. Typical applications include residential waterwells, commercial waterwells, irrigation wells, golf courses, and other sprinkler systems. The Model 234-P is designed to be mounted inside a Grundfos™ control box* to protect ⅓–3 hp, 2- or 3-wire, 230 V pumps. An infrared LED communicates directly with a hand-held diagnostic tool called the Informer (sold separately).

A calibration adjustment allows the 234-P 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, overcurrent, and undercurrent. When an abnormality such as loss of suction is detected, the 234-P deactivates its output relay and directly disconnects the pump motor. The 234-P then begins its user-selectable restart delay (dry-well recovery) timer. When the timer counts to zero or power is removed and reapplied, the 234-P reactivates its output relay and turns the pump back on. By leaving the restart delay knob in the reset position, the 234-P will operate in manual reset mode.

The Informer displays parameters including calibration points, trip points, run time and last faults. An IR Kit-12 (12” fiber optic kit) allows the Informer to access these parameters even when the 234-P is enclosed in a control box. This is valuable for troubleshooting the pump while it is running.

NOTE: The PumpSaver® models have 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.
*The Model 234-P is not recommended for use with the Grundfos Deluxe Control Box.

Features

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

Access specifications, certifications, check availability and order parts below

Catalog #	Input Voltage (V)	Input Load Range (hp)	Output Form	Mounting Method	Weight (lbs/g)	Overcurrent Trip Class	Input AC Line Frequency (Hz)	Output Load Rating (VA)	Overvoltage Trip Voltage (%)	Power Consumption	Rapid Cycle Timer (s)	Restart Delay Range	Trip Delay Range	Underload (%)	Undervoltage Reset Voltage (%)	Stock	Samples

234-P	230 Vac	1/3 - 3	SPST	Inside a Grundfos® control box	0 Kg	125% of calibration point	50 / 60 (50 will increase all delay timers by 20%)	3 hp @ 240 Vac (17 A max.)	265 Vac	≤5 W	4 restarts allowed in 60 s period	Over/Under Voltage: 2 s; All other faults: Manual; 2 - 225 m	Overcurrent: 5 s; Dry-well: 4 s	Adjustable (70 to 90% of calibrated run power)	190 Vac	Check	Order