Why Choose the Finder 99.80.3.000.00 Diode Suppression Module?
The Finder 99.80.3.000.00 is a compact and reliable diode suppression module designed to protect DC relay control circuits against voltage transients generated when relay coils are de-energised. As part of the Finder Series 99 relay accessories range, this standard-polarity diode module provides an effective solution for suppressing inductive voltage spikes in industrial automation, electrical control panels and relay switching applications.
The module incorporates a recovery diode that provides a discharge path for the energy stored in an energised relay coil when the supply is disconnected. This helps limit potentially damaging voltage peaks, reduces electrical interference and supports reliable operation of associated electronic control equipment. Its plug-in construction simplifies installation into compatible Finder relay sockets without requiring a separate external suppression circuit.
With an operating voltage range of 6–220 V DC and standard polarity with the positive connection at terminal A1, the Finder 99.80.3.000.00 is suitable for a broad range of DC-operated relay circuits. Its compact design makes it particularly useful in PLC-controlled automation systems, industrial machinery and electrical distribution control panels where effective relay coil suppression is required.
Key Advantages
- Effective diode suppression of inductive voltage spikes generated by DC relay coils.
- 6–220 V DC operating range supports a wide variety of relay control voltages.
- Standard-polarity configuration with positive connection to terminal A1.
- Helps protect sensitive electronic control circuits against relay switching transients.
- Reduces electromagnetic interference associated with relay coil de-energisation.
- Compact plug-in module design simplifies installation and replacement.
- Compatible with selected Finder relay sockets used in industrial control systems.
- Provides a practical alternative to separately wired external flyback diodes.
Key Features
- Finder Series 99 relay coil suppression accessory.
- Standard-polarity diode module for DC-operated relay coils.
- 6–220 V DC operating voltage range.
- Positive polarity at terminal A1.
- Integrated recovery diode for suppression of reverse-voltage transients.
- Helps reduce electromagnetic interference during relay switching.
- Relay release time may increase by approximately three times compared with operation without diode suppression.
- Plug-in mounting arrangement for compatible relay sockets.
- Suitable for industrial automation and electrical control applications.
- Compact construction for space-efficient installation within control panels.
Technical Specifications
- Manufacturer: Finder
- Series: Series 99
- Model: 99.80.3.000.00
- Product type: Relay coil diode suppression module
- Accessory category: Relay protection and suppression accessories
- Suppression component: Recovery diode
- Operating voltage: 6–220 V DC
- Supply type: Direct current (DC)
- Polarity: Standard polarity
- Positive connection: Terminal A1
- Primary function: Suppression of inductive relay coil voltage transients
- Mounting type: Plug-in relay socket module
- Compatible socket families: Selected Finder 90, 92, 94, 95, 96 and 97 series sockets
- Relay release characteristic: Release time increases by approximately a factor of three
- Application: DC relay coil protection and electromagnetic interference suppression
- RoHS compliance: RoHS compliant
Reliable Relay Coil Protection for Industrial Control Systems
When a DC relay coil is switched off, the magnetic field surrounding the coil collapses and can generate a high reverse-voltage transient. Without suitable suppression, this transient may cause electrical interference or place additional stress on switching transistors, PLC outputs and other electronic control components. The Finder 99.80.3.000.00 provides a diode-based suppression path that limits these voltage peaks and helps protect connected equipment.
The module is designed for installation in compatible Finder relay sockets, providing an integrated suppression solution without the need for additional external wiring. Because diode suppression slows the decay of coil current, relay release time can increase by approximately three times. This characteristic should be considered in applications requiring particularly rapid relay disengagement. Correct DC polarity is essential, with the positive supply connected to terminal A1.
Typical Applications
- Industrial relay control circuits operating from DC supplies.
- PLC output protection in automated machinery and production systems.
- Electrical control cabinets and industrial distribution panels.
- Relay interface modules used in process automation equipment.
- Machine control systems with inductive switching loads.
- Building automation and control installations using DC relay coils.
- Industrial equipment requiring suppression of relay-generated voltage transients.
- Control circuits where electromagnetic interference reduction is important.
