1 of 4
Littelfuse.com/111-INSIDER-P
©2022 Littelfuse, Inc.
Specications are subject to change without notice.
Revised: 10/31/2022
Motor and Pump Protection Relays
111-INSIDER-P
Description
The single-phase 111-Insider-P monitor fits inside
1
⁄3 and
1
⁄2 hp, 115 V control boxes. It is designed to protect single-phase,
submersible pumps from dry-well, dead-head, jammed impellers, rapid-cycle, overvoltage, and undervoltage conditions.
A calibration adjustment allows the Insider 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 product 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 counts to zero or power is removed and reapplied, the relay
reactivates its output relay and turns the pump back on. By leaving the restart delay knob in the reset position, the relay
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-Insider-P 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 & Benets
FEATURES BENEFITS
Proprietary microcontroller-based circuitry
Constant monitoring of voltage and current protects pumps from
fault conditions
Onboard sensitivity adjustment
Allows user to adjust the current sensitivity for the dry-well/dead-
head trip point from 70 %–90 % of the full load
Adjustable restart delay
Allows user to select well recovery time delay after a dry-well
condition occurs, or to select manual reset
Built-in IR communications link
Used with the Informer, allows user to see stored faults, run time,
and also troubleshoot the pump while it’s running
LED indication Provides status and diagnostics for troubleshooting
Applications
• Made for submersible pump systems
Single-Phase Pump Monitor
2 of 4
Littelfuse.com/111-INSIDER-P
©2022 Littelfuse, Inc.
Specications are subject to change without notice.
Revised: 10/31/2022
Motor and Pump Protection Relays
111-INSIDER-P
Specications
Functional Specications
Adjustments/Settings
Overcurrent 125 % of calibration point
Underload (dry-well) Adjustable (70 to 90 % of calibrated run power)
Overvoltage 132.5 V ac
Undervoltage 95 V ac
Number of restarts allowed in
a 60-sec. period (rapid-cycling) 4
Trip Delay Times
Overcurrent 5 seconds
Dry-well 4 seconds
Restart Delay Times
Over/Undervoltage 2 seconds
All other faults Manual, 2–25 minutes
Input Characteristics
Supply Voltage 115 V ac
Load Range
1
⁄3 –
1
⁄2 hp
Frequency 50/60 Hz (Note: 50 Hz will increase all delay timers by 20 %)
Output Characteristics
Output Contact Rating-SPST
1
⁄2 hp @ 120 V ac (17 A max.)
General Characteristics
Operating Temperature -40 °C to 55 °C (-40 °F to 131 °F)
Maximum Input Power 5 W
Weight 10 oz.
Mounting Methods Inside a Pentek*, Franklin*, CentriPro*, Grundfos* (mfg after mid-2014), Flowise Pro,* and
Flint and Walling* control box
Certication & Compliance
cURus
**
UL 508, C22.2 No. 14
Accessories
Informer
A hand-held diagnostic tool that uses an infrared receiver to access information which can be helpful for troubleshooting the
system. Includes the Informer IR Kit-12
Informer IR Kit-12
12” infrared adapter cable attaches to the face of the unit to provide remote diagnostics without opening the panel. Included
with the Informer
Ordering Information
MODEL VOLTAGE DESCRIPTION
111-Insider-P 115 V ac
1
⁄3 –
1
⁄2 hp, includes IR Kit-12 230 V ac
1
⁄3 –1 hp, includes IR Kit-12
*Pentek, Franklin, Grundfos, Flowise Pro, and Flint and Walling are trademarks of their respective owners.
**The 111-Insider-P is an agency approved type 3R control box when installed as described in the installation instructions. The 111-Insider-P is not intended to provide overload
protection, and should be used with thermally or impedance protected motors only.