Technical Review: Finder 55.34.8.024.0040 Power Relay - Selection Guide & Specs
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Overview: Solving Industrial Control Circuit Challenges
Industrial automation systems frequently face reliability issues with control circuits, particularly when switching moderate power loads in manufacturing environments. The Finder 55.34.8.024.0040 power relay addresses these challenges by providing robust, reliable switching for 24VAC control systems handling up to 7A loads. This 14-pin relay is specifically engineered for industrial automation applications where consistent performance and long service life are critical.
Technical Specifications Analysis
The Finder 55 series represents a premium line of industrial relays known for their durability and precise switching capabilities. The 55.34.8.024.0040 model offers specific advantages for 24VAC control systems commonly found in PLC systems, HVAC controls, and industrial machinery.
| Specification | Value | Description |
|---|---|---|
| Coil Voltage | 24VAC | Standard industrial control voltage for safety and compatibility |
| Contact Configuration | 4PDT (4 Form C) | 4-pole double-throw with 4 normally open/4 normally closed contacts |
| Contact Rating | 7A @ 250VAC | Maximum switching capacity for resistive loads |
| Switching Power | 1750VA | Maximum apparent power handling capability |
| Mechanical Life | 10 million operations | Minimum expected mechanical operations |
| Electrical Life | 100,000 operations @ rated load | Expected life at full rated electrical load |
| Mounting | DIN rail (35mm) | Standard industrial mounting system |
| Terminal Type | Screw clamp | Secure connection for industrial wiring |
| Operating Temperature | -40°C to +70°C | Wide temperature range for harsh environments |
| Package Quantity | 10 pieces/box | Bulk packaging for maintenance and installation projects |
Application Scenarios
This relay excels in several key industrial applications:
- Motor Control Circuits: Switching auxiliary circuits for motors up to 1.5HP at 240VAC
- HVAC Systems: Controlling fans, pumps, and compressors in commercial heating and cooling systems
- Industrial Lighting: Managing high-bay lighting and industrial area illumination
- Process Control: Interface between low-voltage control systems and higher-power process equipment
- Safety Circuits: Emergency stop and safety interlock systems requiring reliable switching
The 4PDT configuration provides exceptional flexibility, allowing simultaneous control of multiple circuits or redundant switching paths for critical applications. For broader control components selection, explore our comprehensive range.
Buying Considerations
When selecting the Finder 55.34.8.024.0040 power relay for your application, consider these critical factors:
- Voltage Compatibility: Ensure your control system operates at 24VAC. For different voltages, Finder offers alternative models in the 55 series with coil voltages ranging from 12V to 240V AC/DC.
- Load Requirements: The 7A rating is suitable for moderate power loads. For higher current applications up to 16A, consider the Finder 55.32 series with higher contact ratings.
- Contact Configuration Needs: The 4PDT configuration provides 4 independent switching paths. If you need fewer contacts, 2PDT or 3PDT configurations are available in other models.
- Environmental Conditions: The relay's -40°C to +70°C operating range makes it suitable for most industrial environments. For extreme conditions, consider sealed or encapsulated versions.
- Mounting Requirements: Standard 35mm DIN rail mounting ensures compatibility with industrial control panels. Verify panel space availability for the relay dimensions (typically 90mm x 22.5mm x 58mm).
- Quantity Planning: The 10-piece bulk packaging offers cost savings for maintenance departments and installation projects requiring multiple units.
For complete electrical relays solutions, browse our extensive catalog of industrial switching devices.
Frequently Asked Questions
Q1: Can this relay handle inductive loads like motors?
A: Yes, the Finder 55.34.8.024.0040 is rated for 7A at 250VAC, which includes motor loads. However, for highly inductive loads, consider derating by 20-30% or using additional protection like surge suppressors to extend contact life.
Q2: What is the difference between AC and DC coil versions?
A: AC coils typically have lower resistance and higher inrush current, while DC coils have constant resistance. The 24VAC coil version (55.34.8.024.0040) is designed for AC control circuits. Using an AC coil on DC voltage (or vice versa) can cause overheating or failure to operate properly.
Q3: How do I determine if I need a 14-pin vs. 8-pin relay?
A: The pin count corresponds to the number of contacts. A 14-pin relay like the 55.34.8.024.0040 provides 4PDT (4 poles double throw) with 4 normally open and 4 normally closed contacts. An 8-pin relay typically provides 2PDT (2 poles). Choose based on how many independent circuits you need to switch simultaneously.
