Why Choose the Finder 99.01.9.220.99 Green LED and Diode Suppression Module?
The Finder 99.01.9.220.99 is a compact green LED indication and flyback diode suppression module from the Finder 99 Series, designed for compatible Finder relay sockets operating with 110–220 V DC control supplies. Combining visual relay coil indication with inductive transient suppression, this plug-in accessory provides a practical solution for industrial automation, machinery control and electrical signalling applications.
When voltage is applied to a compatible relay coil, the module's green LED provides a visible indication of the control supply. Its integrated flyback diode helps suppress the inductive voltage transient generated when the relay coil is de-energised, reducing voltage stress on associated control circuit components.
The Finder 99.01.9.220.99 features standard DC polarity, with the positive supply connected to terminal A1. Its blue housing and plug-in construction support convenient installation into compatible Finder relay sockets without requiring separately wired indication and suppression components.
Key Advantages
- Dual-function module: Combines green LED coil indication and flyback diode suppression.
- 110–220 V DC operating range: Designed for compatible higher-voltage DC relay control circuits.
- Green LED indication: Provides clear visual feedback when the relay coil supply is present.
- Integrated flyback diode: Helps limit inductive voltage transients during relay coil switch-off.
- Standard polarity: Positive DC supply connected to terminal A1.
- Plug-in construction: Allows convenient installation into compatible Finder relay sockets.
- Compact accessory design: Reduces the need for separately wired indication and suppression components.
- Blue housing: Provides a recognisable module format within compatible relay assemblies.
- Improved troubleshooting: Local LED indication assists with electrical commissioning and maintenance.
- Control circuit protection: Helps reduce inductive voltage stress on suitable switching devices.
- Modular installation: Supports organised electrical control panel construction.
- Finder 99 Series compatibility: Designed for selected relay sockets accepting 99.01 modules.
Key Features
- Manufacturer: Finder.
- Series: 99 Series.
- Module family: 99.01.
- Model: 99.01.9.220.99.
- Product type: Relay coil indication and suppression module.
- Indication technology: LED.
- LED colour: Green.
- Operating voltage: 110–220 V DC.
- Supply type: Direct current (DC).
- Suppression component: Flyback diode.
- Polarity: Standard polarity, positive to A1.
- Housing colour: Blue.
- Installation: Plug-in connection to compatible relay sockets.
- Function: Visual coil indication and inductive transient suppression.
- Designed for compatible Finder electromechanical relay assemblies.
- Suitable for industrial electrical control and automation equipment.
Technical Specifications
- Manufacturer: Finder
- Series: 99 Series
- Module family: 99.01
- Manufacturer part number: 99.01.9.220.99
- EAN / GTIN: 8012823104683
- Product category: Relay indication and EMC suppression accessories
- Product type: Plug-in LED and diode module
- Operating voltage range: 110–220 V DC
- Supply voltage type: DC only
- LED colour: Green
- Indication function: Relay coil voltage indication
- Suppression technology: Flyback diode
- Suppression function: Limitation of relay coil inductive switching transients
- Polarity: Standard polarity, positive to terminal A1
- Housing colour: Blue
- Electrical connection: Plug-in
- Mounting arrangement: Compatible relay socket accessory receptacle
- Compatible socket family: Selected Finder sockets accepting 99.01 modules
- Compatible socket examples: Finder 90.20, 90.21, 94.73, 94.74, 94.82, 95.63, 95.75, 96.72 and 96.74, subject to socket variant compatibility
- Application: DC relay coil indication and transient suppression
- Installation environment: Suitable industrial electrical control panels and enclosures
Reliable High-Voltage DC Relay Coil Indication and Transient Suppression
The Finder 99.01.9.220.99 combines two important relay accessory functions within a single plug-in module. Its green LED provides visual confirmation that the appropriate DC control voltage is present, while its integrated flyback diode helps control the inductive voltage transient generated when the relay coil is switched off.
Electromechanical relay coils store energy in a magnetic field during operation. When the coil supply is interrupted, this stored energy can generate a reverse voltage that places additional electrical stress on switching devices. The integrated flyback diode provides a controlled path for the coil current to decay, helping reduce voltage spikes affecting suitable transistor outputs and other control circuit components.
The module is specifically designed for 110–220 V DC applications and requires correct polarity. The positive supply must be connected to terminal A1, with the corresponding negative connection at A2. Incorrect polarity can cause excessive current through the diode and potentially damage the module or connected equipment.
Because a flyback diode allows the relay coil current to decay more gradually, it can increase relay release time compared with an unsuppressed coil. Where fast relay release is essential, the effect of the selected suppression method should be considered during system design.
The green LED indicates the presence of the appropriate coil supply voltage but does not independently confirm that the relay contacts have changed state. For dependable operation, the complete relay assembly must be correctly matched, wired and installed according to the manufacturer's instructions.
Typical Applications
- 110–220 V DC industrial relay control circuits.
- High-voltage DC relay coil indication.
- Industrial automation and electrical control panels.
- Relay coil transient suppression.
- PLC and electronic control output protection in suitable applications.
- Industrial machinery control and auxiliary switching.
- Electrical signalling and control systems.
- Industrial process automation equipment.
- Manufacturing and production machinery.
- Power distribution auxiliary control circuits.
- DC control circuits in industrial equipment.
- Electrical commissioning and fault diagnosis.
- OEM electrical panel manufacturing.
- Maintenance of compatible Finder relay assemblies.
