© 2018 Littelfuse Fresh Water Pumping
2
Submersible Pumps – Optimized Protection
Franklin
™
, CentriPro
™
, Pentek
®
, Grundfos
®
or Flint and Walling
™
Control Box
111-INSIDER-P / 231-INSIDER-P
Single-Phase Pump Monitor
Littelfuse.com/Pump-Protection
Description
The Littelfuse 111-Insider-P single-phase products fit inside
¹⁄³
and
½ hp, 115V control boxes and the 231-Insider-P fits inside
¹⁄³,
½,
¾, and 1 hp, 230V control boxes. Both models are designed to
protect single-phase pumps from dry-well, dead-head, jammed
impeller, rapid-cycle, overvoltage, and undervoltage conditions.
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
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 product deactivates its output
relay and directly disconnects the pump motor. The unit then
begins its user-selectable restart delay (dry-well recovery)
timer. When the timer counts to zero or power is removed and
reapplied, the unit reactivates its output relay and turns the
pump back on. By leaving the restart delay knob in the reset
position, the unit will operate in manual reset mode.
The Insider 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 IR Kit-12 (12” fiber optic kit) is included with each
Insider, allowing the Informer to access these parameters even
when the Insider is enclosed in a control box. This is valuable for
troubleshooting the pump while it is running.
NOTE: The 111/231-Insider-P 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.
Accessories
Informer
A hand-held diagnostic tool that uses an infrared
receiver to access information which can be
helpful for troubleshooting the system.
Informer IR Kit-12
Attaches to the face of the unit to provide
remote diagnostics without opening the panel.
(12” fiber optic cable)
MODEL
VOLTAGE
DESCRIPTION
111-Insider-P
115VAC
¹⁄³ - ½ hp, includes IR Kit-12
231-Insider-P
230VAC
¹⁄³ - 1 hp, includes IR Kit-12
Ordering Information
