231-INSIDER-P - 231-Insider-P Series

littelfuse Motor and Pump Protection Relays
The Littelfuse 231-Insider-P fits inside 1/3, 1/2, 3/4, and 1 hp, 230V control boxes and 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 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.

Property (Mouseover for details) Value
Input Voltage (V) 230VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz (50Hz will increase all delay timers by 20%.)
Input Load Range (hp) 1/3 - 1 hp
Output Form SPST
Output Load Rating (VA) 1 hp @ 240VAC (17 amps max.)
Rapid Cycle Timer (s) 4 restarts allowed in 60s period
Restart Delay Range Over/Under Voltage: 2s; All other faults: Manual 2 - 225m
Trip Delay Range Overcurrent: 5s; Dry-well: 4s
Overvoltage Trip Voltage (%) 265VAC
Undervoltage Reset Voltage (%) 190VAC
Overcurrent Trip Class 125% of calibration point
Underload (%) Adjustable (70 to 90% of calibrated run power)
Mounting Method Inside a Franklin™ Pente® or CentriPro™ control box
Operating Temperature -40° to 55°C (-40° to 131°F)
Weight (lbs/g) 0.62 lbs. (10 oz. 283.5g)