Finder 39.01.0.024.0073 – 24 V AC/DC 6 A MasterBASIC ATEX Interface Relay Module
The Finder 39.01.0.024.0073 is a slimline 6 A DIN rail interface relay module designed for reliable switching and electrical interfacing in industrial automation, PLC control panels and process control installations. Part of the Finder 39 Series MasterINTERFACE range, this MasterBASIC module combines a miniature electromechanical relay with a convenient interface socket, providing a compact switching solution for professional control systems.
Featuring a 24 V AC/DC control input and one changeover contact (1CO / SPDT), the Finder 39.01.0.024.0073 allows compatible low-voltage control signals to operate separate electrical circuits. Its 6 A rated contact current, silver-nickel contacts and push-in terminals make it suitable for applications where dependable switching, straightforward wiring and efficient panel assembly are important.
This particular version is distinguished by its ATEX / Class I, Division 2 application designation, making it a candidate for appropriately assessed installations in specified hazardous environments. With a housing width of just 6.2 mm, integrated LED indication and a DIN rail mounting arrangement, it offers a space-saving solution for automation engineers and electrical panel builders.
Key Advantages
- 6 A interface relay module for industrial automation and electrical control.
- 24 V AC/DC control input supports compatible AC and DC control systems.
- One changeover contact (1CO / SPDT) provides flexible switching.
- ATEX / Class I, Division 2 variant for appropriately certified hazardous-area applications.
- Ultra-slim 6.2 mm construction saves space in crowded control cabinets.
- Push-in spring terminals support fast, secure electrical connections.
- Integrated LED indication assists commissioning and fault-finding.
- Silver-nickel (AgNi) contacts provide dependable switching performance.
- Low control input consumption helps reduce the burden on automation outputs.
- DIN rail mounting simplifies installation alongside other interface devices.
- Approximately 5 ms operate time supports responsive control applications.
- Approximately 6 ms release time provides predictable contact return.
- Wide operating temperature range from −40 to +70 °C.
- IP20 protection rating for installation within suitable electrical enclosures.
- MasterBASIC modular design is suitable for PLC interfacing and industrial panel building.
Key Features
- Finder 39 Series MasterINTERFACE relay module.
- MasterBASIC electromechanical interface configuration.
- ATEX / Class I, Division 2 designated version.
- 24 V AC/DC nominal control voltage.
- 50/60 Hz AC supply compatibility.
- One changeover contact (1CO).
- SPDT / Form C switching arrangement.
- 6 A rated contact current.
- 10 A maximum peak contact current.
- 250 V AC rated contact voltage.
- 400 V AC maximum switching voltage.
- 1,500 VA AC-1 rated load.
- 300 VA AC-15 rated load at 230 V AC.
- Silver-nickel (AgNi) contact material.
- Approximately 11 mA rated input current.
- Approximately 0.25 VA / 0.25 W input consumption.
- 19.2–26.4 V AC/DC operating voltage range.
- LED operating indication.
- Push-in spring terminal connections.
- 6.2 mm module width.
- 35 mm DIN rail installation.
- 5 ms operate time and 6 ms release time.
- −40 to +70 °C ambient operating temperature.
- IP20 enclosure protection rating.
How the Finder 39.01 MasterBASIC Interface Relay Works
The Finder 39.01.0.024.0073 provides an interface between a compatible 24 V AC/DC control signal and a separate switched circuit. It uses an electromagnetic relay with a single changeover contact, allowing a common terminal to be connected to either a normally closed or normally open output.
When the control input is de-energised, the common contact is connected to the normally closed (NC) terminal. Applying the appropriate control voltage operates the relay and transfers the common contact to the normally open (NO) terminal. When the control signal is removed, the relay returns to its original position.
This SPDT switching arrangement makes the module useful for PLC output interfacing, equipment control, alarm signalling and signal changeover. A single relay can switch a compatible electrical load or provide a change-of-state signal to another part of an automation system.
The module accepts a 24 V AC/DC nominal input, with a specified operating range of 19.2–26.4 V AC/DC. This allows integration with appropriately rated PLC outputs, industrial control supplies and building automation controllers. The control circuit must be selected according to the module's input characteristics.
Its 6 A rated contacts are suitable for loads within the applicable utilisation category. For example, the specified AC-1 rating is 1,500 VA, while the AC-15 rating at 230 V AC is 300 VA. These ratings are not interchangeable, and inductive loads, electronic power supplies and devices with high inrush current require additional assessment.
The push-in terminal system helps simplify panel wiring and reduce installation time. Conductors must be prepared to the specified stripping length and used within the manufacturer's permitted conductor sizes. The LED indicator provides a convenient visual reference when commissioning or troubleshooting the control circuit.
With a width of only 6.2 mm, the MasterBASIC module allows multiple interface relays to be arranged efficiently along a standard 35 mm DIN rail. This is particularly valuable in PLC cabinets and automation panels containing numerous digital input and output channels.
ATEX and Class I, Division 2 Application Considerations
The Finder 39.01.0.024.0073 is identified as an ATEX / Class I, Division 2 interface relay variant. It is intended for consideration in appropriately designed electrical systems where hazardous-area equipment requirements apply.
Hazardous-area suitability depends on more than the relay's product designation. Installers and system designers must confirm the exact certification marking, permitted hazardous-area classification, temperature requirements, installation conditions and applicable regional regulations against the current Finder documentation.
The module must be installed within an enclosure and electrical system that satisfy the relevant certification conditions. Its IP20 protection rating does not, by itself, provide environmental or explosion protection suitable for unrestricted hazardous-area installation.
The Finder 39.01.0.024.0073 should therefore be selected and installed by suitably competent personnel as part of a fully assessed control system. It must not be treated as an intrinsically safe barrier or as suitable for every ATEX zone solely because it carries an ATEX-related product designation.
Typical Applications
- PLC output interface circuits.
- Industrial automation control panels.
- Process control and instrumentation systems.
- ATEX-designated equipment installations, subject to certification conditions.
- Class I, Division 2 control systems, subject to applicable approvals.
- Low-voltage control signal interfacing.
- Industrial alarm and indication circuits.
- Machine control cabinets.
- Factory automation systems.
- Electrical signal changeover applications.
- Building management and automation panels.
- Control of appropriately rated auxiliary equipment.
- Remote monitoring and control systems.
- Compact DIN rail interface assemblies.
- Electrical panel manufacturing and system upgrades.
