Littelfuse SIR2B20B4 - The SIR2B20B4 relay provides solid-state switching protection with input voltage from 90 to 150 V ac/dc and output voltage at 120 V ac.
Littelfuse

SIR2B20B4

Alternate Item Number: SIR2B20B4

UPC: 079458998719

Documents & Media
BrochureSpecification Sheet

Contact for Pricing

Overview

The Littelfuse SIR2B20B4 is a robust solid-state relay engineered for demanding industrial applications requiring reliable and durable switching solutions. This specific model, part of the SIR Series, offers zero voltage switching capabilities, which is crucial for extending the lifespan of incandescent lamps and minimizing electrical noise when switching resistive loads. Its optically isolated design ensures that the control input is electrically separated from the high-power output, enhancing system safety and allowing for seamless integration between different voltage levels. Designed for rugged operation, the SIR2B20B4 features a totally solid-state and encapsulated construction. This means there are no moving parts to arc, wear out, or fail over time. The encapsulation protects the internal components from environmental factors such as shock, vibration, and humidity, making it an ideal choice for harsh industrial settings. The compact design, measuring just 2 inches (50.8mm) square, makes it perfectly suited for OEM applications where space is at a premium. Key features and benefits of the Littelfuse SIR2B20B4 include: * **High Current Switching:** Capable of handling up to 20A steady-state current and an impressive 200A inrush current, allowing for direct control of heavy inductive, incandescent, or resistive loads. * **Zero Voltage Switching (SIR2 Models):** Minimizes electrical transients and extends the life of connected loads, particularly incandescent lamps, by switching power on and off at the zero-crossing point of the AC waveform. * **Optically Isolated Output:** Provides a safe interface between control circuits and load circuits, protecting sensitive control electronics. * **Wide Control Voltage Range:** Accepts input control voltages from 90 to 150 VAC or VDC, offering flexibility in system design. * **Standard Output Voltage:** Designed to switch loads at 120 VAC. * **Normally Closed Output Form:** The output is closed (conducting) when no control voltage is applied and opens (stops conducting) when control voltage is present. * **Durable Construction:** Totally solid-state and encapsulated for protection against environmental stresses. * **Compact Footprint:** 2-inch square design ideal for space-constrained applications. * **Metalized Mounting Surface:** Facilitates efficient heat transfer, essential for high-current applications and ensuring longevity. The SIR2B20B4 is an excellent choice for a wide array of industrial automation systems, HVAC controls, industrial machinery, lighting control, and power distribution applications where reliable, long-lasting, and safe switching is paramount. Its ability to handle significant inrush currents and its zero-voltage switching capability make it particularly well-suited for applications involving incandescent lighting or other resistive loads that benefit from reduced electrical stress. Trust Littelfuse, a recognized leader in circuit protection and switching solutions, for dependable performance that enhances operational efficiency and system reliability in your most critical applications.
  • Littelfuse SIR2B20B4 Solid-State Relay
  • Input Voltage: 90-150V AC/DC
  • Output Voltage: 120V AC
  • Current Rating: 20A Steady State, 200A Inrush
  • Zero Voltage Switching for reduced electrical noise and extended lamp life
  • Optically isolated control input from power output
  • Totally solid-state and encapsulated for durability
  • Compact 2-inch square design for space-constrained applications
  • Normally Closed output configuration

Specifications

Brand Name
Littelfuse
Connection
Surface mount with one #10 (M5 x 0.8) screw
Current Rating
20 A steady state, 200 A inrush
Material
Solid-state encapsulated
Mounting
Surface mount with one #10 (M5 x 0.8) screw Mount
Mounting Type
Metalized Mounting Surface
Operating Temperature
-20 to 60 F
Operating Temperature, Maximum
60 F
Operating Temperature, Minimum
-20 F
Series
SIR2B
Series
SIR Series
Size
2 inches (50.8mm) square
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Voltage Rating
90-150 V ac/dc (input), 120 V ac (output)
Package Dimensions (L x W x H)
1.51 IN x 2 IN x 2 IN
Package Dimensions (L x W x H)
38.4 mm x 50.8 mm x 50.8 mm
The PHS230A20 relay provides phase control protection with input voltage at 230 V ac and output load rating at steady state (100% on) of 20 A; inrush of 200 A.

PHS230A20

The PHS230A20 relay provides phase control protection with input voltage at 230 V ac and output load rating at steady state (100% on) of 20 A; inrush of 200 A.
3P -SSC I IN - 1FC 600V 3x20A 1200VP

RGC3P60AA20C1

3P -SSC I IN - 1FC 600V 3x20A 1200VP
Power Relays, Solid State Relay, 1 Form A (SPST-NO), Panel, Terminals, Screw Terminals, Potter & Brumfield SSR

1393030-7

Power Relays, Solid State Relay, 1 Form A (SPST-NO), Panel, Terminals, Screw Terminals, Potter & Brumfield SSR
PROGRAMMABLE RELAY CLW-02/20HR-12D 3RD

CLW-02/20HR-12D

PROGRAMMABLE RELAY CLW-02/20HR-12D 3RD

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.