Woodward 5441-413 Amp Relay Interface Module, 32-Channel Relay Output for MicroNet Control Systems

Brand WOODWARD

Model Woodward 5441-413

Product Overview

The Woodward 5441-413 is a high-density relay interface module from the Woodward 5441 family, designed to sit between a turbine or engine control system and the hard electrical world of solenoids, trip coils, contactors and alarm annunciators. Inside a MicroNet, MicroNet Plus or MicroNet TMR control chassis, the controller’s discrete outputs are low-energy logic signals that cannot drive field loads directly; the Woodward 5441-413 takes those commands over the chassis bus and converts them into 32 independent electromechanical relay contact operations, giving the control system a rugged, buffered output stage.

Two functions define the value of the Woodward 5441-413. The first is amplification: a logic-level command becomes a dry contact capable of switching loads rated at up to 10 A, so a single module can energise trip solenoids, auxiliary oil pump starters, breaker close coils and alarm horns without intermediary interposing relays. The second is isolation: galvanic separation rated at 1500 V or higher between the control electronics and the field wiring means that inductive kickback, ground faults and switching surges originating in the plant stop at the module, protecting CPU and I/O boards that are far more expensive to replace.

Mechanically and electrically, the Woodward 5441-413 follows the Woodward control platform it serves, using the VERSAmodule Eurocard (VME) bus standard for connector specification and data transfer, and routing field connections through cables to field termination modules in the cabinet. Each of the 32 channels carries its own LED so a technician can see at a glance which output has energised, which is exactly what is needed during commissioning or a middle-of-the-night trip investigation on a steam or gas turbine installation.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	Woodward 5441-413
Manufacturer	Woodward, Inc.
Product Type	Amp Relay Interface Module, discrete relay output interface
System Platform	Woodward MicroNet, MicroNet Plus and MicroNet TMR control chassis
Number of Channels	32 independent relay channels
Relay Type	Electromechanical relay, SPDT (single-pole double-throw) contact configuration
Contact Rating	Up to 10 A per channel; 250 V AC / 30 V DC maximum switching voltage per series rating
Isolation Voltage	1500 V AC minimum galvanic isolation between control logic and field circuits (input to output typically greater than 1500 V DC)
Coil / Logic Supply	24 V DC nominal, wide-range input typically 18 V DC to 32 V DC
Input Interface	Digital control signals from the controller via the chassis backplane bus
Bus Standard	VERSAmodule Eurocard (VME) bus for connector specification and data transfer
Response Time	Less than 5 ms typical relay actuation after command
Contact Resistance	Less than 100 mΩ
Status Indication	Individual LED indicator per channel
Field Connection	Cables from the front of the board to field termination modules (FTMs) in the cabinet
Operating Temperature	-20°C to +60°C (-4°F to +140°F); extended ratings to +70°C on some system configurations
Storage Temperature	-40°C to +85°C (-40°F to +185°F)
Relative Humidity	5% to 95%, non-condensing
Protection Rating	IP20, for installation inside a control cabinet or enclosure
Mounting	Chassis or rack mount within the Woodward control assembly; field terminal variants support panel or DIN-rail mounting
Protection Features	Over-voltage and short-circuit protection on the logic side, surge suppression across relay contacts
Certifications	CE and UL; system-level compliance with CSA and RoHS where applicable
Approximate Weight	0.63 kg to 0.9 kg depending on assembly revision

Main Features and Advantages

High-density output that shrinks the cabinet: Thirty-two independent relays in one module replace a panel full of interposing relays, terminal blocks and wiring. For a turbine control cabinet where every discrete output needs its own isolation and its own status lamp, the Woodward 5441-413 compresses that function into a single chassis slot, which reduces wiring labour, cabinet space and the number of terminations that can fail.

Amplification and isolation in one stage: The controller side of the Woodward 5441-413 sees only a low-current logic command, while the field side receives a dry contact rated up to 10 A. Because the contacts are voltage-agnostic, the same module can switch 24 V DC interlocks, 120 V AC annunciator circuits and 250 V AC solenoid or contactor coils, and the 1500 V isolation barrier keeps any fault on those circuits from reaching the control electronics. This dual role is what makes the module an amplifier in the practical sense: a small control signal governs a much larger load safely.

Deterministic switching for protection logic: Relays on the Woodward 5441-413 respond in under 5 ms, and because the switching element is electromechanical rather than a semiconductor, the behaviour under fault conditions is predictable and easy to verify during proof testing. In trip and emergency shutdown service, that predictability matters more than raw speed, and it is why relay interface modules remain the preferred output stage for turbine protection even in modern digital control systems.

Diagnostics built for the field: An LED on every channel gives immediate, unambiguous indication of which outputs are energised, so a technician investigating a failed start sequence or a spurious trip can trace the logic path without a laptop. Combined with the controller’s own diagnostics, this shortens fault-finding from hours to minutes and reduces the risk of unnecessary module replacement.

Designed for the Woodward ecosystem and for long service life: The Woodward 5441-413 plugs into the same VME-based architecture as the rest of the 5441 family, drawing logic power and commands from the chassis backplane and routing field wiring to field termination modules. Industrial-grade contacts are rated for high cycle counts under load, and the module is built to withstand the vibration, temperature cycling and electrical noise found in turbine halls, compressor stations and engine rooms.