1. Introduction
This manual provides essential information for the safe and effective use of the Finder 40.31.9.024.0000 SPDT (Single Pole Double Throw) Electromechanical Relay. This relay is designed for general-purpose power switching applications, featuring a 24VDC coil and a 10A contact rating at 250VAC. It is suitable for through-hole mounting in various industrial and electronic circuits.
2. Safety Information
WARNING: Electrical components can cause electric shock or fire if not handled correctly. Always observe the following safety precautions:
- Ensure power is disconnected before installation, wiring, or maintenance.
- Installation should only be performed by qualified personnel.
- Verify all connections are secure and correct according to the wiring diagram.
- Do not exceed the specified voltage and current ratings of the relay.
- Protect the relay from moisture, dust, and extreme temperatures.
- This product is RoHS compliant. Dispose of it according to local regulations at the end of its life cycle.
3. Product Overview
The Finder 40.31.9.024.0000 is a compact electromechanical relay from the 40 Series, designed for reliable switching in various control circuits. It features a single pole double throw (SPDT) contact configuration, allowing it to switch between two circuits. The relay operates with a 24VDC coil and can handle up to 10 Amps at 250VAC. Its through-hole mounting design makes it suitable for PCB integration.
Figure 3.1: Front view of the Finder 40.31.9.024.0000 SPDT Relay. This image shows the general appearance of the relay, typically a rectangular housing with pins extending from the bottom for PCB mounting.
4. Technical Diagrams and Dimensions
Understanding the physical dimensions and pin configuration is crucial for proper installation and integration into your circuit board. The following diagram illustrates the relay's footprint, pin spacing, and overall dimensions.
Figure 4.1: Technical drawing showing the dimensions and pinout of the Finder 40.31.9.024.0000 relay. The top-left diagram shows the bottom view with pin spacing (e.g., 3.5mm, 7.5mm, 20mm, 6mm). The top-right diagram illustrates the internal schematic with coil terminals A1, A2 and contact terminals 11 (common), 12 (normally closed), 14 (normally open). The bottom diagrams provide side and front views with overall dimensions (e.g., 29mm length, 25mm height, 12.4mm width, 0.4mm and 1mm pin thickness).
5. Installation
The Finder 40.31.9.024.0000 relay is designed for through-hole mounting on a Printed Circuit Board (PCB). Follow these steps for proper installation:
- Prepare the PCB: Ensure the PCB has correctly sized holes and pad layouts matching the relay's pin configuration as shown in Figure 4.1.
- Insert the Relay: Carefully align the relay pins with the corresponding holes on the PCB. Ensure the relay is oriented correctly.
- Solder Connections: Solder each pin to its respective pad on the PCB. Use appropriate soldering techniques to ensure strong, reliable electrical and mechanical connections. The relay terminals are designed for soldering.
- Coil Connections: Connect the 24VDC power supply to the coil terminals A1 and A2. Polarity is typically indicated on the relay or in the schematic (A1 positive, A2 negative for DC coils, but check specific markings).
- Contact Connections: Connect the load circuits to the contact terminals:
- Terminal 11: Common contact.
- Terminal 12: Normally Closed (NC) contact. This contact is closed when the coil is de-energized.
- Terminal 14: Normally Open (NO) contact. This contact is closed when the coil is energized.
- Verify Installation: After soldering, visually inspect all connections for shorts, cold solder joints, or other defects.
6. Operation
The Finder 40.31.9.024.0000 relay operates by energizing its 24VDC coil. When the coil is energized, an electromagnetic field is created, which pulls the armature, causing the common contact (11) to switch from the Normally Closed (12) position to the Normally Open (14) position. When the coil is de-energized, the armature returns to its original state, and the common contact (11) reconnects with the Normally Closed (12) contact.
- Coil Voltage: Apply 24VDC to terminals A1 and A2 to activate the relay.
- Contact Switching: The relay provides a mechanical switch action, isolating the control circuit (coil) from the load circuit (contacts).
- Load Capacity: Ensure the switched load does not exceed 10 Amps at 250VAC. Exceeding these limits can damage the relay and connected equipment.
7. Maintenance
The Finder 40.31.9.024.0000 relay is a sealed component and generally requires minimal maintenance. However, periodic inspection can help ensure its longevity and reliable operation:
- Visual Inspection: Regularly check for any signs of physical damage, discoloration, or overheating on the relay body and terminals.
- Environmental Conditions: Ensure the operating environment remains within specified temperature and humidity ranges. Protect the relay from excessive dust or corrosive atmospheres.
- Connection Integrity: Periodically verify that all soldered connections remain secure and free from corrosion.
- Cleaning: If necessary, gently clean the exterior of the relay with a dry, soft cloth. Do not use solvents or abrasive cleaners.
8. Troubleshooting
If the relay is not functioning as expected, consider the following troubleshooting steps:
- Relay Not Activating:
- Check if the correct 24VDC is applied to coil terminals A1 and A2.
- Verify coil current (nominal 27mA).
- Inspect for open circuits in the coil wiring.
- Ensure the power supply is functioning correctly.
- Load Not Switching:
- Confirm the relay coil is activating (a faint click might be audible).
- Check continuity across the contact terminals (11-12 and 11-14) when the coil is energized and de-energized.
- Verify that the load circuit is correctly wired to the common (11) and desired NO (14) or NC (12) contacts.
- Ensure the load current and voltage do not exceed the relay's contact ratings.
- Overheating:
- This indicates excessive current or voltage. Immediately disconnect power.
- Recheck all circuit parameters against the relay's specifications.
If issues persist after troubleshooting, consider replacing the relay or consulting a qualified technician.
9. Specifications
The following table summarizes the key electrical and mechanical specifications for the Finder 40.31.9.024.0000 relay. For detailed performance curves and additional characteristics, refer to the manufacturer's full datasheet (Figure 9.1 provides an overview of such data).
Figure 9.1: Overview of Finder 40.31.9.024.0000 Relay Characteristics. This image displays several tables and graphs, including general characteristics (insulation, immunity), contact characteristics (current vs. operations, current vs. DC voltage), and detailed coil characteristics for DC, AC, and AC/DC versions, showing nominal voltage, resistance, and power consumption.
| Parameter | Value |
|---|---|
| Model Number | 40.31.9.024.0000 |
| Contact Configuration | SPDT (Single Pole Double Throw) |
| Coil Voltage | 24 VDC |
| Coil Current | 27 mA |
| Coil Resistance | 900 Ohm |
| Contact Current Rating | 10 Amps |
| Maximum Switching Current | 10 Amps (20A peak) |
| Contact Voltage VAC | 250 VAC |
| Contact Material | Silver Nickel |
| Mounting Type | Through Hole (PCB Mount) |
| Relay Terminals | Solder |
| External Depth | 29 mm |
| External Height | 25 mm |
| External Width | 12.4 mm |
| Nominal Operating Power | 650 mW |
| RoHS Compliant | Yes |
| Item Weight | 0.01 ounces (approx. 0.28 grams) |
10. Warranty and Support
This Finder relay is manufactured to high-quality standards. For specific warranty information, please refer to the terms and conditions provided by your point of purchase or contact Finder directly. Technical support and further documentation can typically be found on the official Finder website or through authorized distributors.
