Littelfuse TDMB422D - DIGI-SET (D.O.M./D.O.B.)
Littelfuse

TDMB422D

UPC: 079458999709

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Specification Sheet

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse TDMB422D DIGI-SET (D.O.M./D.O.B.) is a high-performance digital input/output module engineered for industrial control and automation systems where precise timing and reliable signal processing are critical. Designed to meet the demands of modern manufacturing, process control, and machinery automation, this versatile module combines dual-function delay-on-make (D.O.M.) and delay-on-break (D.O.B.) capabilities in a single, compact plug-in package. Whether deployed in discrete manufacturing, material handling, conveyor systems, or HVAC control applications, the TDMB422D delivers exceptional accuracy, repeatability, and operational longevity in harsh industrial environments. At the core of the TDMB422D is Littelfuse’s proprietary microcontroller-based timing circuitry, which provides exceptional precision with a repeat accuracy of ±0.1% or 20ms (whichever is greater) and a setting accuracy of ≤ ±2% or 50ms. This ensures consistent performance across thousands of cycles, even under fluctuating voltage and temperature conditions. The module supports a wide input voltage range from 12VDC to 240VAC/DC, making it compatible with global power standards and ideal for retrofitting into existing control panels. Its tolerance of -15% to +20% for low-voltage DC and -20% to +10% for high-voltage AC/DC further enhances system resilience against power fluctuations. The TDMB422D features a robust electromechanical relay output rated at 10A resistive across 120/240VAC and 28VDC, with a maximum switching voltage of 250VAC. Available in SPDT or DPDT configurations, it supports up to 1/3 hp at 230VAC, ensuring reliable switching for motors, solenoids, and inductive loads. The relay boasts an impressive mechanical life of 10⁷ operations and electrical life of 10⁵ operations, minimizing maintenance and maximizing uptime. Dual LED indicators—green for initiate status and red for relay activation—provide clear visual feedback for troubleshooting and system monitoring. Time delay settings are easily configured using dual binary switches, allowing users to set both on-delay (T1) and off-delay (T2) times independently from 0.1 to 102.3 seconds in 0.1-second increments, or up to 10,230 seconds in 10-second steps. This flexibility supports complex timing sequences in applications such as motor start delays, safety interlocks, or process sequencing. The module’s reset time of ≤150ms ensures rapid recovery after de-energization, critical for high-cycle automation tasks. Designed for industrial-grade reliability, the TDMB422D includes built-in protection features such as reverse polarity protection for DC units, insulation resistance ≥100MΩ, and isolation voltage ≥1500V RMS between input and output. It operates reliably across a wide temperature range from -20°C to +60°C and can be stored between -30°C and +85°C, making it suitable for both indoor and outdoor installations. The compact plug-in design with octal 8-pin or magnal 11-pin termination simplifies installation and replacement, reducing downtime during maintenance or upgrades. Littelfuse, a global leader in circuit protection and industrial automation solutions, has built a reputation for delivering high-quality, durable components that meet stringent industry standards. The TDMB422D is part of the trusted TDMB Series, widely used in applications across automotive, food and beverage, packaging, water treatment, and building automation. Professionals in control engineering, panel building, and system integration rely on Littelfuse products for their proven performance, long service life, and adherence to safety certifications, including CE approval for European markets. Ideal for engineers and technicians seeking a dependable, high-precision timing module, the TDMB422D offers a cost-effective solution without compromising on functionality or durability. Its plug-and-play design eliminates complex wiring, while the clear LED indicators and intuitive switch configuration streamline commissioning and diagnostics. Whether used in new installations or as a replacement in legacy systems, the TDMB422D enhances operational efficiency, reduces system failures, and supports compliance with industrial safety and performance standards.
  • Dual-function delay-on-make (D.O.M.) and delay-on-break (D.O.B.) in one module
  • Wide input voltage range: 12VDC to 240VAC/DC with high tolerance for power fluctuations
  • High-reliability electromechanical relay output rated 10A @ 120/240VAC & 28VDC, 1/3 hp @ 230VAC
  • Precise timing: 0.1–102.3s in 0.1s steps, up to 10,230s in 10s steps with ±0.1% repeat accuracy
  • Compact plug-in design with octal 8-pin or magnal 11-pin termination for easy installation

Specifications

Connection Type
Octal 8-pin or magnal 11-pin
Current Rating
10 A resistive
Mounting Type
Plug-in
Poles
SPDT or DPDT
Series
TDMB
Voltage Rating
12-240 VAC/DC
RTXD Extractor Tool

6896057-1

RTXD Extractor Tool
RTXP 18

RK926011-BC

RTXP 18
Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10
Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

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.