Littelfuse 235P-ENCL - The 235P-ENCL is an enclosed single-phase pump monitor with an input voltage value of 230 V ac, an input load range of 5–15 hp (external current transformer required), and the following dimensions: 8.3” H x 5.36” W x 3.68” D.
Littelfuse

235P-ENCL

Alternate Item Number: 235P-ENCL

UPC: 079458990386


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Overview

The Littelfuse 235P-ENCL is a single-phase pump monitor designed for critical motor and pump protection in industrial, agricultural, and municipal applications. This enclosed unit (SKU: 235P-ENCL) safeguards 230VAC systems operating pumps from 5 to 15 horsepower, requiring an external current transformer (CT) for accurate current sensing. Housed in a NEMA 3R enclosure, it provides reliable protection against dry-well conditions, dead-head operation, jammed impellers, overvoltage, undervoltage, and overcurrent faults. Key features include adjustable underload (dry-well) protection settable between 70% and 90% of calibrated run power, overcurrent protection at 125% of calibration, and monitoring for overvoltage (265VAC) and undervoltage (190VAC). The unit allows up to 4 restarts within a 60-second period to prevent rapid cycling. Trip delays are configurable: 5 seconds for overcurrent, 4 seconds for dry-well, and 2 seconds for over/undervoltage faults. All other faults require a manual restart with a delay adjustable from 2 to 225 minutes. The 235P-ENCL operates within a temperature range of -40°C to 60°C (-40°F to 140°F) and is cUL Listed to UL508 and C22.2 No. 14 standards. Its compact dimensions (73.66mm H x 133.35mm W x 73.99mm D) and 14 oz weight make it suitable for space-constrained installations. The output contact rating is SPST A300, 720A @ 240VAC (10 amps max.). For enhanced diagnostics, the optional Informer handheld tool (IR Kit-12) provides infrared access to fault history, run time, calibration points, and trip settings. Compatible external CTs include CT-0050-D10 (50:5 ratio for 7.5HP), CT-0075-D10 (75:5 ratio for 10HP), and CT-0100-D10 (100:5 ratio for 15HP). Ideal for submersible pumps, irrigation systems, water transfer pumps, and other single-phase motor applications, the 235P-ENCL ensures optimal pump performance and prevents costly downtime.
  • Protects 5-15HP single-phase pumps from dry-well, dead-head, and jammed impeller conditions
  • Adjustable underload protection (70-90% of calibrated run power) and overcurrent trip at 125%
  • Monitors overvoltage (265VAC) and undervoltage (190VAC) with 2-second restart delay
  • NEMA 3R enclosure for environmental protection; operates from -40°C to 60°C
  • Optional Informer diagnostic tool for fault history and troubleshooting via infrared
  • External CT required (CT-0050-D10, CT-0075-D10, or CT-0100-D10 sold separately)

Specifications

Brand Name
Littelfuse
Frequency
50/60 Hz
Mounting
#8 screws
NEMA Rating
NEMA 3R
Number Of Poles
#8 screws
Operating Temperature
-40 to 131
Operating Temperature, Maximum
131
Operating Temperature, Minimum
-40
Pickup Voltage
230 V
Series
235P
Size
2.9" H x 5.25" W x 2.913" D
Special Features
5YR WARR
Standard
UL
Sub Brand
Symcom
Voltage Rating
230 V AC
Package Dimensions (L x W x H)
3.68 IN x 5.36 IN x 8.3 IN
Package Dimensions (L x W x H)
93.5 mm x 136.1 mm x 210.8 mm
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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.