© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Motor and Pump Protection
www.littelfuse.com/
Rev: 1-A-062116
www.littelfuse.com/www.littelfuse.com/111p-233p
111P / 233P SERIES
Single-Phase PumpSaver
®
Description
The 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) single-phase PumpSaver
®
relays
protect pumps from dry-well, dead-head, jammed impeller,
rapid-cycling, and overvoltage/undervoltage, whether the
pressure switch is mounted before or after our unit.
A calibration process allows the relay to be calibrated to your
specific pumping application, 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 relay deactivates its output relay and directly
disconnects the pump motor and begins its user-selectable
“Restart Delay” (dry-well recovery) timer. When the timer
expires or power is removed and reapplied, the unit 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). The
Informer displays parameters including calibration points, trip
points, run time and last faults.
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.
*All local, state and national electric codes should be followed when applying this solution.
NOTE: The 111P / 233P Series relays 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.
Features & Benefits
FEATURES BENEFITS
Proprietary
microcontroller based
circuitry
Constant monitoring of voltage, power factor, current
for reliable pump protection
Onboard calibration
process
Calibrates unit to your specific individual pumping
application and reduces nuisance tripping
Onboard sensitivity
adjustment
User adjustable sensitivity knob makes the unit more
adaptable to varying pumping applications
Accessories
Informer
A hand-held diagnostic tool that uses an infrared
receiver to access information which can be
helpful for troubleshooting the system.
Wiring Diagram
Ordering Information
MODEL LINE VOLTAGE DESCRIPTION
111P 115VAC Load Range: ¹⁄
³
- 1hp
111P-ENCL 115VAC 111P with NEMA3R enclosure
233P 230VAC Load Range: ¹⁄
³
- 3 hp
233P-ENCL 230VAC 233P with NEMA3R enclosure
233P-1.5 230VAC Load Range: ¹⁄
³
- 1.5hp
233P-1.5-ENCL 230VAC 233P-1.5 with NEMA3R enclosure
