Name: 233P Series - Single-Phase Pump Monitor
Brand: Littelfuse Inc.

233P Series - Single-Phase Pump Monitor

Series: 233P

Questions? Contact Littelfuse Support

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 233P is a single-phase pump monitor designed to protect single-phase pumps from dry-well, dead-head, jammed impeller, rapid cycle, overvoltage and undervoltage conditions. The 233P protects 230 volt, 2 or 3 wire, 1/3 to 3hp pumps.

A calibration adjustment allows the 233P to be calibrated to your specific pumping applications, thereby reducing the possibility of false or nuisance tripping. A proprietary microcontroller based voltage, power factor and current-sensing circuit constantly monitors for power fluctuations, overcurrent and underload conditions. When an abnormality, such as loss of suction, is detected, the 233P 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 expires or power is removed and reapplied, the relay reactivates its output relay and allows the pump to turn back on.

An infrared LED communicates directly with a hand-held diagnostic tool called the Informer (sold separately).

NOTE: The 233P 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, you increase the sensitivity closer to the 90% mark, or if you have a very heavy producing well, you would decrease the sensitivity around the 70% mark.

Access specifications, certifications, check availability and order parts below

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

233P	230 Vac	1/3 - 3	SPST	Torque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG	#8 screws	2.93 H x 5.25 W x 2.91 D in. (73.7 x 133.4 x 74 mm)	0 Kg	125% of calibration point	50 / 60 (50 will increase all delay timers by 20%)	5	3 hp @ 240 Vac (17 A max.)	265 Vac	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	Check	Order
233P-1.5	230 Vac	1/3 - 1.5	SPST	Torque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG	#8 screws	2.93 H x 5.25 W x 2.91 D in. (73.7 x 133.4 x 74 mm)	0 Kg	125% of calibration point	50 / 60 (50 will increase all delay timers by 20%)	5	1.5 hp @ 240 Vac (10 A max.)	265 Vac	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	Check	Order
233P-1.5-ENCL	230 Vac	1/3 - 1.5	SPST	Torque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG	#8 screws	8.3 H x 5.36 W x 3.68 D in. (210.8 x 136.1 x 93.5 mm)	0 Kg	125% of calibration point	50 / 60 (50 will increase all delay timers by 20%)	5	1.5 hp @ 240 Vac (10 A max.)	265 Vac	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	Check	Order
233P-ENCL	230 Vac	1/3 - 3	SPST	Torque: 13 in-lbs; Wire: Solid or stranded 10 - 22 AWG	#8 screws	8.3 H x 5.36 W x 3.68 D in. (210.8 x 136.1 x 93.5 mm)	0 Kg	125% of calibration point	50 / 60 (50 will increase all delay timers by 20%)	5	3 hp @ 240 Vac (17 A max.)	265 Vac	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	Check	Order