DIN rail 12V relay switching module

Reliable Access Control and Load Switching for Server Rooms and Security Technology

The Didactum DIN Rail 12V Relay Switching Module is a central element for monitoring and controlling critical business areas – particularly in the server room as well as in security-relevant zones such as access areas, technical rooms, or sensitive production environments. Via a dry-contact input, the module can be triggered by a Didactum Monitoring System or other controllers with a transistor dry-contact output and then switches electronic locks, sirens, lighting, fans, or other 12V or 230V loads.

The two versatile switching outputs can be used, depending on the application, either as a potential-free 5A relay contact or as an actively powered 12V/0.5A output. This makes the module equally suitable for controlling door locks, sirens, warning lights, or climate technology and allows flexible integration into access control, alarm, and automation systems.

Design of the Relay Switching Module

The module is housed in a compact plastic enclosure (90 × 36 × 34 mm, approx. 200 g) for mounting on a 35 mm DIN rail.

Since the input is designed for transistor dry contacts, the module can be combined not only with Didactum Monitoring Systems but in principle with any controller that has a matching dry-contact output.

From Dry Contact to Switched Load

When the connected dry-contact output triggers – for example because a Monitoring System reports an alarm or an access control system issues a release – the Relay Switching Module switches the corresponding output. Depending on the configuration, either a potential-free 5A contact is closed, through which an external circuit is switched, or a 12V/0.5A voltage is output directly to the connected load.

Wiring the Module

The triggering dry contact is connected to the 4-pole input terminal (3.5 mm). The load or loads to be controlled – for example an electronic door lock, a siren, or a warning light – are connected to the 6-pole output terminal (3.81 mm); for each output, the correct polarity and the desired operating mode (relay contact or 12V output) must be observed. The module is powered via the supplied 12V/1A supply, either via the barrel connector (DC 1.35 mm) or via the 2-pole terminal. The maximum cable length between the module and the connected load or controller is up to 200 meters.

Mounting on the DIN Rail

The module is designed for quick mounting on a 35 mm DIN rail in a control cabinet or rack.

1. Place the housing against the upper edge of the DIN rail
2. Push the housing downward into the rail until it clicks securely into place
3. To remove, release the retaining clip with a screwdriver and pull the housing outward

Application Areas of the Relay Switching Module

• Access control and door control: Actuation of electronic locks on doors, racks, or cabinets
• Alarm and notification systems: Activation of sirens, flashing lights, or external alarm systems in the event of an alarm
• Building automation: Control of fans, air conditioning, or lighting when threshold values are exceeded
• IT and telecommunications environments: Secure control of access to racks and technical cabinets
• Industry and production: Control of machines, conveyor belts, or safety equipment
• Emergency and security systems: Automatic unlocking of doors or release of emergency exits when required

Performance Data at a Glance

What Is Included in the Scope of Delivery

Please check the scope of delivery for completeness upon receipt and report any missing or damaged parts immediately to your supplier.

• DIN Rail 12V Relay Switching Module (housing)1 unit
• Plug-in power supply, 12V/1A1 unit
• Connection terminals (input & output)included

Why This Relay Switching Module Is the Right Choice

Frequently Asked Questions