Why Choose the Finder 99.01.9.024.99 LED and Diode Module?
The Finder 99.01.9.024.99 is a compact and reliable green LED indication and diode suppression module designed for DC-operated industrial relay control circuits. As part of the established Finder 99 Series coil indication and EMC suppression module range, it combines visual relay coil status indication with effective protection against inductive voltage transients.
This module incorporates a green LED indicator and an integrated recovery diode. The LED illuminates when the relay coil is energised, allowing engineers and maintenance personnel to identify active control circuits quickly. The diode suppresses the reverse voltage spike generated when the relay coil is switched off, helping protect connected PLC outputs, electronic switching devices and other sensitive control equipment.
With an operating voltage range of 6–24 V DC and a standard-polarity configuration with positive connected to terminal A1, the Finder 99.01.9.024.99 is suitable for low-voltage DC relay applications. Its compact plug-in design enables straightforward installation into compatible Finder 96 Series relay sockets, making it a practical accessory for industrial automation, machine control and electrical panel assemblies.
Key Advantages
- Compact LED indication and diode suppression module for industrial relay applications.
- 6–24 V DC operating range suitable for common low-voltage control circuits.
- Integrated green LED indicator provides clear visual confirmation of relay coil energisation.
- Built-in recovery diode suppresses reverse voltage transients generated during relay switching.
- Standard-polarity configuration with positive supply connected to terminal A1.
- Helps protect PLC transistor outputs and electronic control devices from inductive voltage spikes.
- Plug-in installation simplifies assembly, maintenance and replacement.
- Reduces electromagnetic interference (EMI) associated with relay coil de-energisation.
- Compact design minimises additional space requirements inside electrical control panels.
Key Features
- Finder 99 Series coil indication and EMC suppression module.
- 6–24 V DC operating voltage.
- Green LED for relay coil status indication.
- Integrated recovery diode for back-EMF suppression.
- Standard polarity: positive supply connected to A1.
- Designed exclusively for DC relay coil circuits.
- Reverse voltage peaks are suppressed by the diode when the relay coil is de-energised.
- Relay release time increases by approximately three times compared with operation without the recovery diode.
- Compatible with appropriate Finder 96 Series relay sockets.
- Suitable for use with compatible Finder 56 Series industrial power relays.
- Compact plug-in construction for convenient socket integration.
- RoHS-compliant construction.
- Designed for industrial automation, machinery control and electrical switching applications.
Technical Specifications
- Manufacturer: Finder
- Series: 99 Series Coil Indication and EMC Suppression Modules
- Model: 99.01.9.024.99
- Product type: LED indication and diode suppression module
- Module function: Relay coil indication and transient voltage suppression
- Operating voltage: 6–24 V DC
- Supply type: Direct current (DC)
- Indicator type: LED
- LED colour: Green
- Suppression component: Recovery diode
- Suppression method: Flyback diode / back-EMF suppression
- Polarity: Standard polarity
- Positive connection: Relay coil terminal A1
- Relay release time effect: Approximately 3 times the unsuppressed release time
- Compatible accessory family: Finder 96 Series relay sockets
- Associated relay series: Finder 56 Series
- Mounting type: Plug-in module for compatible relay sockets
- Approximate net weight: 2.7 g
- Country of origin: Italy
- RoHS compliance: Compliant
- EAN: 8012823104591
Reliable DC Relay Coil Indication and Back-EMF Protection
Industrial relay coils are inductive components that store energy in a magnetic field while energised. When the supply voltage is removed, the collapsing magnetic field generates a reverse voltage transient that can place electrical stress on connected switching components. The Finder 99.01.9.024.99 uses an integrated recovery diode to provide a discharge path for this stored energy, suppressing potentially damaging voltage peaks and reducing electromagnetic interference.
The integrated green LED indicator illuminates when the relay coil is energised, providing a convenient visual reference for installation checks, maintenance and troubleshooting. The module uses standard DC polarity with positive connected to terminal A1. Because diode suppression allows the stored coil energy to dissipate more gradually, relay release time increases by approximately a factor of three. For applications requiring faster relay release, a compatible Finder varistor or RC suppression module may be more suitable.
Typical Applications
- Industrial electrical control panels and switchgear assemblies.
- PLC transistor output protection and relay interface circuits.
- 6–24 V DC industrial relay coil applications.
- Manufacturing machinery and automated production equipment.
- Motor control and auxiliary switching circuits.
- Building automation and HVAC control systems.
- Electrical distribution and control cabinets.
- Relay status monitoring, maintenance and fault diagnosis.
