Eltako S12 Bistable Relay - S12-110-24V DC
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Product Information
Full details
The Eltako S12 Bistable Relay (S12-110-24V DC) is designed for electrical control systems requiring reliable switching. It is ideal for electricians and automation specialists needing a compact, DIN-rail mountable relay with manual override capabilities. While it offers robust performance, users should be aware that its 24V DC control voltage requires a specific power source. Key features include a single make (NO) and single break (NC) contact, manual operation with switch position indication, and a 16A current rating.
All features
| Series | S12-110-24V DC |
|---|---|
| Model Part Number | 21110055 |
| Brand | Eltako |
Extended Product Information
FAQs
What is the purpose of a bistable relay?
A bistable relay, also known as a latching relay, maintains its last switching state even when the control power is removed. This means it only requires a momentary pulse to change its state, saving energy compared to monostable relays that need continuous power.
What type of DIN rail is required for mounting?
The Eltako S12-110-24V DC is designed for mounting on standard DIN rails conforming to DIN-EN 50.022 standards.
Can this relay be used with AC loads?
The product specifications indicate a 24V DC control voltage. While the contacts can switch AC loads, ensure the voltage and current ratings of the load are compatible with the relay's 16A capacity and the operational characteristics of the contacts.
How do I manually change the relay's state?
The relay features manual actuation. You can typically use a button or switch connected to the control terminals, or in some designs, a direct manual toggle, to change the relay's position. The switch position indicator will show the current state.
What is the contact distance?
The contact distance for this relay is 3mm.
What is the power requirement for control?
The control power requirement is 5-6W. The control voltage is 24V DC.
Does the relay require continuous power to stay switched on or off?
No, as a bistable relay, it only requires a momentary pulse to switch states. It will maintain its last state without requiring continuous power, making it energy efficient.
Troubleshooting
Relay does not switch when control signal is applied.
Verify that the control voltage is stable at 24V DC and correctly connected to the control terminals. Ensure the control signal is a pulse sufficient to trigger the bistable mechanism. Check that the manual override is not engaged.
Relay switches, but contacts do not make or break the load circuit.
Confirm that the load is correctly wired to the NO/NC contacts. Check the current rating of the load against the relay's 16A capacity. Ensure the contacts are clean and free from debris.
Switch position indicator is not accurate.
This may indicate an internal issue. Ensure the relay is functioning mechanically. If the discrepancy persists, consider replacing the unit.
Relay fails to maintain its state after power is removed.
Bistable relays are designed to hold state without power. If the state is lost, ensure the control pulse was sufficient and check for any external factors interfering with the holding mechanism. Verify the product is indeed a bistable type.
Pros and Cons
Pros
- Reliable bistable switching requires no holding power.
- Integrated manual override and status indicator simplifies operation and diagnostics.
- Compact 18mm width saves space on DIN rails.
- High 16A contact rating supports various electrical loads.
- Compatible with standard 24V DC control systems.
Cons
- Requires a specific 24V DC power supply.
- Manual operation might be less convenient for remote or automated systems without external control.
- Limited to one NO and one NC contact; not suitable for complex switching arrangements.
- Contact distance of 3mm may not be sufficient for all high-voltage or safety-critical applications.
Setup, Compatibility & Care
Setup:
- Ensure the power supply is disconnected before installation.
- Mount the relay securely onto a standard DIN rail (DIN-EN 50.022).
- Connect the control voltage (24V DC) to the designated control terminals.
- Wire the load circuits to the normally open (NO) and normally closed (NC) contacts.
- Verify all connections are secure.
Compatibility:
- The relay is designed for 24V DC control circuits.
- Compatible with standard 18mm DIN rail systems.
- Suitable for loads up to 16A.
Care:
- Keep the relay clean and free from dust and moisture.
- Avoid exposing the relay to excessive heat or direct sunlight.
- Periodically check wiring connections for tightness.