Finder 20 Bistable Relay - 20.23.8.024.4000
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Product Information
Full details
This Finder 20 bistable relay (MPN: 20.23.8.024.4000) is designed for professionals in electrical installations and automation who need reliable switching for AC control circuits. Its key benefit is maintaining its last switching state without continuous power, reducing energy consumption. A potential caveat is its specific 24V AC coil voltage requirement, necessitating careful system integration. This compact, 18mm wide relay mounts on a 35mm DIN rail and features 1 make (NO) and 1 break (NC) contact rated for 16A at 250V AC, making it suitable for controlling lighting and other loads.
All features
| Series | 20 |
|---|---|
| Model Part Number | 20.23.8.024.4000 |
| Brand | Finder |
Extended Product Information
FAQs
What is a bistable relay?
A bistable relay is an electromechanical switch that remains in its last position (ON or OFF) even after the control power is removed. It requires a pulse to switch states.
What is the advantage of a bistable relay over a monostable relay?
The primary advantage is energy efficiency. Bistable relays only consume power during the switching pulse, whereas monostable relays require continuous power to hold their state.
What type of loads can this relay switch?
It can switch various loads up to 16A at 250V AC, including incandescent (2000W), fluorescent (1000VA), and LED (400W at 230V AC) lighting. Consult the datasheet for specific load type limitations.
Can I use a DC voltage to control this relay?
No, this specific model (20.23.8.024.4000) is designed for a 24V AC coil voltage only. Using DC voltage will not operate the relay and may cause damage.
How do I manually operate the relay without applying voltage?
The relay features a mechanical test button. Pressing this button allows you to manually switch the relay's contacts between their NO and NC positions for testing or manual operation.
What is the contact material used?
The contacts are made of AgSnO2 (Silver Tin Oxide), which offers good conductivity and resistance to wear from electrical arcing.
Is this relay suitable for outdoor use?
No, the relay has an IP20 protection rating, meaning it is designed for indoor use in dry environments and is protected against solid objects larger than 12.5mm but not against water ingress.
Troubleshooting
Relay does not switch when coil is energized.
Verify the coil voltage is exactly 24V AC and the frequency is within 50-60Hz. Check wiring to the coil terminals for secure connections. Ensure the test button is not stuck in a position preventing switching.
Contacts are welded or do not open/close properly.
Check if the load current exceeds the 16A rating or if the voltage exceeds 250V AC. Ensure the contact material (AgSnO2) is appropriate for the load type; arcing may damage contacts over time if overloaded.
Relay switches intermittently or fails to hold state.
Ensure the control signal is a clean pulse of 24V AC. Loose wiring or unstable power supply to the coil can cause issues. Confirm the relay is not subjected to excessive vibration.
Mechanical indicator does not match contact status.
This may indicate an internal fault. Ensure the relay is properly seated on the DIN rail and has not been physically damaged. If the issue persists, replace the unit.
Pros and Cons
Pros
- Energy efficient due to bistable design (no holding power required).
- Space-saving 18mm width for efficient panel layout.
- Robust build with AgSnO2 contacts for longevity.
- Easy installation on standard 35mm DIN rails.
- Clear indication of switching state via mechanical display and test button.
Cons
- Requires a 24V AC coil voltage, limiting direct compatibility with other DC systems.
- Only one NO and one NC contact, may not be sufficient for complex switching logic.
- IP20 protection rating means it's suitable for dry, indoor environments only.
- No latching/unlatching terminals; uses impulse signals.
Setup, Compatibility & Care
Setup:
- Mounting: Securely attach the relay to a standard 35mm DIN rail using the integrated clip.
- Wiring: Connect the control circuit to the coil terminals using the specified 24V AC supply. Wire the load circuit through the 16A rated NO and NC contacts.
- Testing: Use the integrated test button to manually cycle the relay's state and verify correct wiring.
Compatibility:
- Control Voltage: Requires a 24V AC supply (50-60Hz).
- Load Type: Suitable for resistive, inductive, and capacitive loads within the 16A/250V AC rating. Note specific load limits for lighting types (incandescent, fluorescent, LED).
- Enclosure: Ensure the relay is installed in an environment suitable for its IP20 protection rating.
Care:
- Cleaning: Disconnect power before cleaning. Use a dry or slightly damp cloth to wipe the exterior. Avoid solvents or abrasive cleaners.
- Environment: Install in a clean, dry location free from excessive dust, vibration, and corrosive fumes.