Littelfuse 231-INSIDER-P - The 231-Insider-P provides single-phase protection for submersible pumps with an input voltage of 230 V ac and input load range from ⅓–1 hp. Its output load rating is 1 hp @ 240 V ac (17 A maximum).
Littelfuse

231-INSIDER-P

Alternate Item Number: 231-INSIDER-P

UPC: 079458990300


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Overview

The Littelfuse 231-INSIDER-P (SKU: 231-INSIDER-P) is a single-phase pump protector engineered for 230V AC submersible pump systems rated 1/3 to 1 hp. Designed to fit directly inside 1/3, 1/2, 3/4, and 1 hp control boxes, this device provides comprehensive protection against critical failure modes including dry-well, dead-head, jammed impeller, rapid cycling, overvoltage, and undervoltage conditions. Its proprietary microcontroller-based voltage and current-sensing circuitry continuously monitors power for abnormalities, ensuring real-time fault detection and response. When a fault such as loss of suction is detected, the unit deactivates its output relay, disconnecting the pump motor to prevent damage. A user-selectable restart delay timer enables automatic recovery after dry-well conditions or manual reset mode for controlled restart. The 231-INSIDER-P supports an input load range of 1/3 to 1 hp and delivers an output load rating of 1 hp @ 240V AC with a maximum current of 17A. Onboard sensitivity adjustment allows fine-tuning of the dry-well/dead-head trip point between 70–90% of full load, adapting to low-producing or high-producing wells. Integrated IR communication via the included IR Kit-12 enables diagnostics with the optional Littelfuse Informer tool, displaying calibration points, trip points, run time, and last faults—even when the unit is enclosed in a control box. LED indicators provide immediate status and diagnostic feedback. This protector enhances pump longevity, minimizes downtime, and reduces costly motor damage in residential water wells, commercial wells, irrigation systems, and golf course applications.
  • Protects 230V AC submersible pumps rated 1/3–1 hp from dry-well, dead-head, jammed impeller, rapid cycling, overvoltage, and undervoltage faults
  • Microcontroller-based voltage and current sensing for real-time fault detection and automatic pump disconnection
  • Onboard sensitivity adjustment (70–90% of full load) for dry-well/dead-head trip point calibration
  • User-selectable restart delay timer for automatic recovery or manual reset mode
  • Integrated IR communication with Littelfuse Informer tool for diagnostics (sold separately) and LED status indicators
  • Includes IR Kit-12 for communication with optional Informer diagnostic tool

Specifications

Brand Name
Littelfuse
Connection Type
Screw Terminal
Current Rating
17 A
Frequency
60 Hz
Mounting
Surface mountable on backplane using 4 crews
Number Of Poles
Surface mountable on backplane using 4 crews
Operating Temperature
-40 to 158
Operating Temperature, Maximum
158
Operating Temperature, Minimum
-40
Pickup Voltage
12-24 V
Poles
1P
Series
231
Special Features
5YR WARR
Standard
UL/CSA/CE
Sub Brand
Symcom
Voltage Rating
230 V AC
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Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.