Littelfuse ARP42S - The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. LED’s indicate the status of the output relay. This versatile series may be front panel mounted (BZ1 accessory required) or 35 mm DIN rail mounted with an accessory socket. Operation: Alternating: When the rotary switch is in the “alternate” position, alternating operation of Load A and Load B occurs upon the opening of the control switch S1. To terminate alternating operation and cause only the selected load to operate, rotate the switch to position “A” to lock Load A or position “B” to lock Load B. The LEDs indicate the status of the internal relay and which load is selected to operate. Note: Input voltage must be applied at all times for proper alternation. The use of a solid-state control switch for S1 may not initiate alternation correctly. S1 voltage must be from the same supply as the unit’s input voltage (see connection diagrams on datasheet). Loss of input voltage resets the unit; Load A becomes the lead load for the next operation. Duplexing (Cross Wired): Duplexing models operate the same as alternating relays and when both the Control (S1) and Lag Load (S2) Switches are closed, Load A and Load B energize simultaneously. The DPDT 8-pin, cross-wired option, allows extra system load capacity through simultaneous operation of both motors when needed. Relay contacts are not isolated.
Littelfuse

ARP42S

Alternate Item Number: ARP42S

UPC: 079458991451

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Contact for Pricing

Overview

The Littelfuse ARP42S is a DPDT 11-pin alternating relay designed for systems requiring equal run time between two motors. Operating at 120VAC and 50/60 Hz, this relay ensures balanced motor usage by facilitating alternating operation of Load A and Load B. Its versatile functionality includes a low-profile selector switch that allows for seamless selection between alternating mode or locking the relay to a specific load (Load A or Load B) for continuous operation, preventing accidental actuation. Visual confirmation of the active load is provided by integrated LED status indicators, offering immediate operational feedback. The ARP42S offers flexible mounting options, supporting both 35 mm DIN rail mounting with an accessory socket and front panel mounting when the BZ1 accessory is utilized. For duplexing applications, where simultaneous operation of both loads is required, a cross-wired option is available, providing extra system load capacity. It is crucial to note that input voltage must be continuously applied for proper alternation, and any loss of input voltage will reset the unit, defaulting to Load A as the lead load for the subsequent operation cycle. The control switch (S1) voltage must originate from the same supply as the unit's input voltage. This relay is ideal for critical industrial applications such as pump controls, liquid level controls, and HVAC systems where reliable motor load management and extended equipment life are paramount. The industry-standard 11-pin base connection ensures straightforward integration into various existing systems. Key features include alternating or electrically locked operation, a low-profile selector switch to prevent accidental actuation, and LED status indication for visual feedback on which load is engaged. The ARP42S is a reliable solution for managing dual motor loads effectively.
  • Ensures equal run time for two motors
  • 120VAC, 50/60 Hz operation
  • DPDT 11-pin configuration
  • Selector switch for alternation or locking to Load A/B
  • LEDs indicate output relay status
  • Supports DIN rail or front panel mounting
  • Resets to Load A upon power loss

Specifications

Brand Name
Littelfuse
Mounting
Plug-in socket Mount
Mounting Type
DIN rail or front panel
Number Of Poles
Plug-in socket
Operating Temperature
-20 to 60 F
Operating Temperature, Maximum
60 F
Operating Temperature, Minimum
-20 F
Poles
DPDT
Series
ARP
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Package Dimensions (L x W x H)
1.78 IN x 2.39 IN x 3.2 IN
Package Dimensions (L x W x H)
45.2 mm x 60.7 mm x 81.3 mm
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Frequently Asked Questions

What technical support resources does Littelfuse offer?

Littelfuse provides a Techline with experts who can answer product questions, offer technical information, provide engineering drawings, and give application assistance. They can be contacted at 1-800-TEC-FUSE or [email protected].

What types of technical products does Littelfuse manufacture?

Littelfuse produces a wide range of industrial electrical protection products including UL Class fuses, high-speed fuses, medium voltage fuses, solar fuses, protection relays, motor protection devices, ground-fault protection relays, and arc-flash protection relays.

How can I access Littelfuse product and sales information?

Littelfuse offers multiple resources including RepFiles mobile app, Littelfuse University online training, Digital Marketing Assets portal, and the Littelfuse Business Center website for accessing product information, technical resources, and sales tools.

What marketing support does Littelfuse provide to distributors?

Littelfuse offers a Marketing to Marketing program that includes co-branded email campaigns, content sharing, marketing best practices, product launch support, and website linking. The program is free and aims to help distributors grow sales.

How can distributors save on inventory and maintenance costs?

Littelfuse offers the MROplus™ program, which helps manufacturing facilities reduce inventory, decrease downtime, improve safety, and lower costs through strategic inventory management.

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.