TWDDRA16RT Schneider Electric Twido Relay Output Module

Product Overview

The TWDDRA16RT is an electromechanical relay output expansion module engineered by Schneider Electric.

This rugged component expands the physical channel capability of your Twido programmable logic controller platform.

It integrates 16 independent normally open (NO) relay contact points to switch diverse voltage types directly.

Unlike electronic outputs, this mechanical module provides full electrical isolation between your system logic and external actuators.

Field wiring is managed via a heavy-duty removable screw terminal block to ensure reliable field maintenance.

Global PLC Spare HUB's Insight

From a control engineering view, the TWDDRA16RT serves as an ideal interface for mixed-voltage environments.

It handles up to 2 A per individual channel, providing much higher current capacity than standard solid-state models.

The internal arrangement utilizes two isolated common returns, splitting the switching bus into two 8-point groups (Channels 0-7 and 8-15).

This dual-bus design allows engineers to run alternating current on one block and direct current on the other safely.

Low contact resistance of under 40,000 µOhm minimizes thermal build-up inside high-density control enclosures.

System Compatibility & Target Equipment

This relay unit interfaces seamlessly with the following industrial automation equipment:

• Schneider Electric Twido compact and modular base controllers
• Heavy industrial AC/DC motor starters, contactors, and control relays
• High-draw alarm horns, stack lights, and field notification sirens
• Fractional horsepower motor drives and motorized mixing valves

Technical Specifications

• Brand: Schneider Electric
• Model: TWDDRA16RT
• Product Series: Twido
• Module Type: Discrete mechanical relay output module
• Output Count: 16 independent contact channels
• Output Contact Form: 16 Normally Open (Form A NO) contacts
• Wiring Interface: Removable screw terminal block
• Isolated Common Groups: 2 separate common points (COM0 for channels 0-7, COM1 for channels 8-15)
• Maximum Current Per Channel: 2 A maximum load
• Maximum Current Per Common Bus: 8 A total per common line
• Contact Resistance: ≤ 40000 µOhm across closed paths
• Mechanical Response Time: ≤ 7 ms actuation delay
• Dielectric Isolation: 1500 Vrms for 1 minute between channel and internal logic circuitry
• Internal Bus Current Demand: 45 mA at 5 V DC state 1 (all points active)
• External System Current Demand: 75 mA at 24 V DC state 1 (all points active)
• Enclosure Protection Level: IP20 finger-safe design
• Operating Thermal Limit: 0 °C to 55 °C ambient air
• Module Net Weight: 0.145 kg

Core Application Scenarios

• Multi-voltage isolation panels for mechanical facility management
• Interlocking circuit control lines within automated stamping presses
• HVAC exhaust fan activation and damper motor control boards
• Water distribution pumping systems requiring mixed AC and DC valve control

Advanced Diagnostic Capabilities

• The controller software tracks the status of the internal pilot relay coils directly.
• 1500 Vrms galvanic isolation stops high-voltage field surges from blowing back into the processor bus.
• The removable block architecture enables immediate open-circuit testing via multi-meter probes without disconnecting wires.

Procurement & Logistics Terms

• Processing Time: Worldwide dispatch guaranteed within 24 to 48 hours
• Logistics Partners: Express premium tracking via FedEx, UPS, and DHL
• Warranty Protection: Full 12-month complete hardware warranty coverage
• Package Inclusions: One factory-packed, brand new TWDDRA16RT relay module with terminal header

Engineering Selection Guide

• Verify that your switching frequency does not exceed the mechanical cycle limits of a standard relay.
• Choose this model if your circuit demands flexible handling of concurrent AC and DC voltages on one block.
• Ensure total load current across any single group of eight channels remains below the 8 A common threshold.

FAQ

Can I route an AC phase through common 0 and a DC voltage through common 1 simultaneously?

Yes, the internal groups are entirely separate, allowing isolated operation of mixed voltage networks up to the rating limit.

What is the benefit of the removable screw terminal block over fixed variants?

It allows rapid replacement of the core module without needing to unscrew and re-label your field wires individually.

Does this module require an external 24 V DC supply to drive the relays?

Yes, it draws 75 mA at 24 V DC externally to energize the internal mechanical coils when all outputs activate.

How should I protect the relay contacts when switching inductive motor starter coils?

We highly recommend installing external RC snubbers for AC loads or flyback diodes for DC loads to prevent arc wear.

What indicates a physical contact failure within the 16 NO channels?

If the controller logic confirms an active output state but the field circuit remains open, the contact has reached end-of-life.

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