Points heater – Type SMDC7

Switching module for 750 V DC up to 1500 W


The switching module is the power section of the points heater controller of the newest generation.

Each switching module controls a heating rod and monitors its function.
The switching module communicates with a storage programmable control (SPC) via three control lines. The SPC must have available one digital output and two digital inputs.

The switching module consists of a power section and a control section.
The power section switches the heating rod and monitors the current through the heating rod for exceeding the upper and lower values. The heating rod is switched off if impermissible values are identified. An IGBT is used as a switching element.
The control section is based on a microcontroller. It is responsible for communication with the superordinated controller and for evaluation of the switching and error states.

In the event of a short circuit or interruption, an error message is generated and transmitted to the superordinated controller.

The connections for the auxiliary power supply and data lines are located in the base of the housing and contact is established via a plug system in the top hat rail during the installation.

The high-voltage connections are located in the upper part of the housing and are made in the form of plug-in screw terminals.

This design allows to maintain the required safety distances.

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