Littelfuse 350-200-2 - 3PH VOLT mntr/190-240V/adj.restart Dly. The 350 is a heavy-duty voltage monitor. This product should be used when high current relays or dual contacts are required, or 480V controls are used. Since the 350 uses heavy-duty relays, it comes in fixed voltage range models rather than a dual autoranging version like the Model 250. The 350-200 has a 15A general purpose contact. The 350-400 provides a SPDT (Form C) relay rated to switch up to 600V, allowing the use of 480V controls, eliminating the need for a control power transformer to step the voltage down to 120-240V. Several DPDT (two Form C contacts) relay models are also available. The 350 microcontroller-based family of products are low cost yet highly advanced solutions to heavy-duty problems. The 350 includes advanced single LED diagnostics. Five different light patterns distinguish faults and normal operating conditions. Other options such as high voltage trip and adjustable restart delay are available.
Littelfuse

350-200-2

UPC: 079458989885

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Overview

The Littelfuse 350-200-2 is a heavy-duty, microcontroller-based 3-phase voltage monitor engineered for critical industrial control applications requiring robust voltage monitoring and controlled motor restarts. This model operates within a fixed voltage range of 190-240VAC and features an adjustable restart delay (2-300 seconds), making it ideal for systems where staggered motor startups are necessary to prevent low voltage conditions after a fault. The 350-200-2 is equipped with a 15A general-purpose SPDT (Form C) output contact, providing reliable switching for high-current relays or dual contacts in harsh industrial environments. Unlike auto-ranging models, the 350 Series employs heavy-duty relays for enhanced reliability, particularly in applications demanding direct control of 480V systems. Alternative models in the 350 Series offer SPDT relays rated up to 600V, eliminating the need for a control power transformer to step voltage down to 120-240V. The 350-200-2 is UL, CSA, and CE certified, with an operating ambient temperature range of -40°C to 70°C (-40°F to 158°F). Key features include proprietary microcontroller-based circuitry for continuous 3-phase voltage monitoring to protect against harmful line conditions, even before motor startup. Advanced single-LED diagnostics provide five distinct light patterns to distinguish faults and normal operating conditions, enabling quick troubleshooting. The device offers a low voltage trip at 90% of setpoint (reset at 93%) with a 4-second delay, and voltage unbalance trip at 6% (reset at 4.5%) with a 2-second delay. Specifications include a pilot duty rating of 480VA @ 240VAC and general-purpose contact rating of 15A. The compact design measures H 74.42 mm x W 133.86 mm x D 74.93 mm (2.93" x 5.27" x 2.95"), with a weight of 1.05 lbs (476.27 g).
  • Fixed voltage range: 190-240VAC for consistent monitoring
  • 15A general-purpose SPDT (Form C) output contact for high-current applications
  • Adjustable restart delay (2-300 seconds) for staggered motor startups
  • Advanced LED diagnostics with five distinct fault/normal operation patterns
  • UL, CSA, and CE certified with operating temperature range of -40°C to 70°C
  • Low voltage trip at 90% of setpoint (reset at 93%), unbalance trip at 6% (reset at 4.5%)
  • Compact design: 74.42 x 133.86 x 74.93 mm (2.93" x 5.27" x 2.95")
  • Pilot duty rating: 480VA @ 240VAC; general-purpose contact: 15A

Specifications

Brand Name
Littelfuse
Current Rating
15 A
Operating Temperature
-40 to 158
Operating Temperature, Maximum
158
Operating Temperature, Minimum
-40
Poles
3P
Poles
SPDT (Form C)
Series
350
Series
350 Series
Special Features
5YR WARR
Standard
UL/CSA/CE
Sub Brand
Symcom
Voltage Rating
190-240 V
3PH Volt.Mon./380-480V/adj.RD/2x15A Rlys. The 350 is a heavy-duty voltage monitor. This product should be used when high current relays or dual contacts are required, or 480V controls are used. Since the 350 uses heavy-duty relays, it comes in fixed voltage range models rather than a dual autoranging version like the Model 250. The 350-200 has a 15A general purpose contact. The 350-400 provides a SPDT (Form C) relay rated to switch up to 600V, allowing the use of 480V controls, eliminating the need for a control power transformer to step the voltage down to 120-240V. Several DPDT (two Form C contacts) relay models are also available. The 350 microcontroller-based family of products are low cost yet highly advanced solutions to heavy-duty problems. The 350 includes advanced single LED diagnostics. Five different light patterns distinguish faults and normal operating conditions. Other options such as high voltage trip and adjustable restart delay are available.

350-400-2-8

3PH Volt.Mon./380-480V/adj.RD/2x15A Rlys. The 350 is a heavy-duty voltage monitor. This product should be used when high current relays or dual contacts are required, or 480V controls are used. Since the 350 uses heavy-duty relays, it comes in fixed voltage range models rather than a dual autoranging version like the Model 250. The 350-200 has a 15A general purpose contact. The 350-400 provides a SPDT (Form C) relay rated to switch up to 600V, allowing the use of 480V controls, eliminating the need for a control power transformer to step the voltage down to 120-240V. Several DPDT (two Form C contacts) relay models are also available. The 350 microcontroller-based family of products are low cost yet highly advanced solutions to heavy-duty problems. The 350 includes advanced single LED diagnostics. Five different light patterns distinguish faults and normal operating conditions. Other options such as high voltage trip and adjustable restart delay are available.
CM-PVS.81S THREE-PHASE MON.

1SVR730794R2300

CM-PVS.81S THREE-PHASE MON.
Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage

PMDU

Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage
Relay 460V 3 Phase Monitor

18883000015

Relay 460V 3 Phase Monitor

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.