EMC module, LED green + varistor 110-240VAC/DC 99.02.0.230.98

Protective and Signaling Module with Varistor and LED

This module, catalog number 99.02.0.230.98, combines overvoltage protection with optical signaling. It is a universal solution for various electrical and electronic installations where protection against harmful overvoltages and visual monitoring of the circuit status are required.

Functionality and application

This module uses a varistor to limit the reverse voltage generated when switching off relay coils – both DC and AC. The varistor limits the peak voltage to approximately 2.5 times the rated supply voltage, protecting sensitive installation components from damage. Additionally, the built-in LED indicates the excitation status of the relay coil, which facilitates diagnostics and monitoring of the circuit operation. Therefore, the module works perfectly in applications requiring reliable protection and quick identification of potential problems.

Advantages and benefits

• Versatility: The module is designed to work with both DC and AC coils.
• Overvoltage protection: The varistor effectively limits the reverse voltage, protecting installation components from damage.
• Optical signaling: The built-in LED informs about the excitation status of the coil, facilitating diagnostics and monitoring of the circuit operation.
• Compliance with standards: Modules of the 99 series are compliant with ATEX (Ex ec)* standards, allowing their use in potentially explosive atmospheres (check the documentation of the specific model).
• Minimal impact on release time: Compared to other overvoltage suppression methods (e.g., suppression diode), the varistor module causes only a slight increase in the relay release time.
• Easy installation: The module is designed for mounting on a DIN rail or directly on a printed circuit board (depending on the version).

Construction and parameters

The module contains a varistor and an LED placed in a housing providing adequate electrical and mechanical insulation. It is adapted to work in a wide range of supply voltages – from 110 to 240 VAC/DC – which makes it a universal solution for various applications. Remember to connect the positive pole to terminal A1 when using DC coils to ensure optimal protection and module operation.