Littelfuse SCR430T - The SCR series are Tower and Obstruction Lighting Controls used in a variety of applications. The SCR430T and SCR630T are universal lamp alarm relays designed to sense the failure of flashing or steady incandescent beacon lamps or steady side lights. The SCR9L is a universal lamp alarm relay designed to sense the failure of flashing or steady LED beacon lamps or obstruction lamps. The SCR490D Series is used to provide remote monitoring of steady burning incandescent marker and obstruction lighting. Four onboard switches allow operator programming for lighting systems with two through nine lamps on a single AC circuit. See the Technical Resource Section below for individual datasheets containing specifications and operation details.
Littelfuse

SCR430T

Alternate Item Number: SCR430T

UPC: 079458998511

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Overview

The Littelfuse SCR430T (SKU: SCR430T) is a universal lamp alarm relay engineered for critical tower and obstruction lighting applications. This control unit is specifically designed to monitor the operational status of incandescent beacon lamps and steady side lights, ensuring continuous visibility by detecting lamp failures. The SCR430T utilizes a toroidal current sensor, providing isolation from the lighting circuit and enabling simultaneous monitoring of up to four side lights or up to four beacon lamps. Upon detecting a lamp failure, indicated by a decrease in current flow, the SCR430T initiates a fixed 6-second trip delay. Following this delay, an onboard LED illuminates, and two alarm outputs energize: an isolated 10A, SPDT relay contact and a 1A solid-state line voltage alarm output, suitable for remote monitoring or activating auxiliary alarms. The system automatically resets when failed lamps are replaced and current returns to nominal, or when input voltage is removed. The SCR430T features switch-selectable options for lamp wattage (116W or 620W), lamp voltage (120V), and the number of lamps operating simultaneously (1-4), allowing a single unit to adapt to various lighting configurations. Its compact dimensions (88.9 mm H x 63.5 mm W x 44.5 mm D) and screw termination for up to 14 AWG wire facilitate straightforward installation. Operating within a temperature range of -55°C to 65°C, the SCR430T ensures reliability in demanding environments. It is part of the Littelfuse SCR series, which also includes models like the SCR630T (230VAC) and SCR9L (for LED lamps).
  • Monitors 1-4 incandescent beacon or side lights
  • Universal 120VAC input voltage
  • Switch-selectable lamp wattage (116W/620W) and number of lamps
  • Fixed 6-second trip delay to prevent nuisance alarms
  • Dual alarm outputs: 10A SPDT relay and 1A solid-state line voltage

Specifications

Brand Name
Littelfuse
Connection
Two #6 (M3.5 x 0.6) screws
Connection Type
Screw Terminal (up to 14 AWG)
Current Rating
10 A
Mounting
Two #6 (M3.5 x 0.6) screws Mount
Operating Temperature
-40 to 65 F
Operating Temperature, Maximum
65 F
Operating Temperature, Minimum
-40 F
Poles
1 SPDT + 1 Solid-State
Series
SCR Series
Size
88.9 mm H x 63.5 mm W x 44.5 mm D
Special Features
10Y WARR
Standard
CE/CSA
Sub Brand
SSAC
Voltage Rating
120 VAC
The SCR series are Tower and Obstruction Lighting Controls used in a variety of applications. The SCR430T and SCR630T are universal lamp alarm relays designed to sense the failure of flashing or steady incandescent beacon lamps or steady side lights. The SCR9L is a universal lamp alarm relay designed to sense the failure of flashing or steady LED beacon lamps or obstruction lamps. The SCR490D Series is used to provide remote monitoring of steady burning incandescent marker and obstruction lighting. Four onboard switches allow operator programming for lighting systems with two through nine lamps on a single AC circuit. See the Technical Resource Section below for individual datasheets containing specifications and operation details.

SCR630T

The SCR series are Tower and Obstruction Lighting Controls used in a variety of applications. The SCR430T and SCR630T are universal lamp alarm relays designed to sense the failure of flashing or steady incandescent beacon lamps or steady side lights. The SCR9L is a universal lamp alarm relay designed to sense the failure of flashing or steady LED beacon lamps or obstruction lamps. The SCR490D Series is used to provide remote monitoring of steady burning incandescent marker and obstruction lighting. Four onboard switches allow operator programming for lighting systems with two through nine lamps on a single AC circuit. See the Technical Resource Section below for individual datasheets containing specifications and operation details.

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.