Littelfuse ERDM422 - The ERDM Series is a combination of digital electronics and a reliable electromechanical relay. These devices offer a DPDT relay output for relay logic circuits, and isolation of input to output voltages. Cost effective for OEM applications, such as random starting, sequencing ON, switch de-bouncing, anti-short cycling, and other common delay-on-make applications. Operation (Delay-on-Make): Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
Littelfuse

ERDM422

Alternate Item Number: ERDM422

UPC: 079458992960

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse ERDM422 is a highly reliable Delay-on-Make (On-Delay) time delay relay, expertly engineered to integrate advanced digital electronics with robust electromechanical relay technology. This combination ensures precise timing control and dependable operation for a wide array of industrial automation and OEM applications. The ERDM422 features a versatile Double Pole Double Throw (DPDT) relay output, providing two independent sets of contacts for maximum circuit flexibility. A critical design element is the inherent input-to-output isolation, with an isolation voltage rating of ≥1500V RMS, safeguarding sensitive control circuitry from voltage transients and surges. This isolation is paramount in industrial environments where electrical noise and varying voltage levels are common. Designed for cost-effectiveness without compromising performance, the ERDM422 is an ideal choice for Original Equipment Manufacturers (OEMs) seeking robust timing solutions. Its primary function is the delay-on-make operation: upon application of input voltage, the time delay sequence begins. During this delay period, the output contacts remain de-energized. Only after the preset time delay has elapsed will the output contacts energize, remaining so until the input voltage is removed. This functionality is crucial for applications such as: * **Random Starting:** Ensuring equipment starts in a staggered fashion to prevent inrush current overload on power supplies. * **Sequencing ON:** Controlling the order in which multiple devices are powered up, preventing system instability. * **Switch De-bouncing:** Eliminating spurious signals from mechanical switches, ensuring a clean and stable input signal. * **Anti-Short Cycling:** Preventing compressors or other equipment from cycling on and off too rapidly, which can cause damage and reduce lifespan. * **General Delay-On-Make Applications:** Any scenario requiring a specific delay before a circuit is activated. The reset mechanism is straightforward and reliable: removing the input voltage immediately resets the time delay and de-energizes the output, preparing the unit for the next cycle. This ensures consistent and predictable performance in repetitive operations. **Key Specifications and Features:** * **Time Delay Type:** Digital integrated circuitry for high accuracy and stability. * **Time Delay Range:** Available in 11 adjustable ranges from 0.1s to 500m, or a fixed 0.1s to 1000m range, offering flexibility for diverse timing needs. * **Repeat Accuracy:** An impressive ±0.5% ensures consistent timing performance over multiple cycles. * **Input Voltage Options:** Supports a wide range of input voltages including 12, 24, or 120VDC, and 24, 120, or 230VAC, accommodating various power systems. * **Output Contacts:** DPDT configuration with a robust 10A resistive rating at 120/240VAC and 28VDC, and 1/3 hp at 120/240VAC. * **Mechanical Life:** Rated for 1 x 10^7 operations, ensuring long-term reliability. * **Full Load Life:** 1 x 10^6 operations at full load. * **Mounting:** Designed for convenient surface mounting using two #6 screws (M3.5 x 0.6). * **Termination:** Features 0.25 in. (6.35 mm) male quick connect terminals for easy and secure wiring. * **Operating Temperature Range:** Operates reliably in harsh environments from -40° to 65°C. With its combination of precise digital timing, robust electromechanical output, and essential isolation features, the Littelfuse ERDM422 is a cost-effective and dependable solution for critical timing functions in industrial machinery, control panels, and automated systems. Trust Littelfuse, a recognized leader in circuit protection and control, for your essential timing relay needs.
  • Digital Delay-on-Make (On-Delay) functionality
  • DPDT isolated relay output contacts
  • High input-to-output isolation (≥1500V RMS)
  • Cost-effective solution for OEM applications
  • Wide range of input voltages (12-240VDC/VAC) and timing options

Specifications

Brand Name
Littelfuse
Connection Type
0.25 in. (6.35 mm) male quick connect terminals
Current Rating
10A
Mounting
Surface mount with four #6 (M3.5 x 0.6) screws Mount
Mounting Type
Surface mounting with two #6 screws (M3.5 x 0.6)
Number Of Poles
Surface mount with four #6 (M3.5 x 0.6) screws
Operating Temperature
-20 to 65 F
Operating Temperature, Maximum
65 F
Operating Temperature, Minimum
-20 F
Poles
DPDT
Series
ERDM
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Voltage Rating
12-240VAC/DC
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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.