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Finder Bistable Relay - 20.23.9.024.4000

Finder Bistable Relay - 20.23.9.024.4000

The finder type 20.23 modular step relays feature a 16A rating and a double phase switch with 1 no...

Best current price£23.91from Tameson UK

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Tameson UKFinder Bistable Relay - 20.23.9.024.4000
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Product Information

Full details

This guide is for electricians and automation engineers who need a reliable and compact relay for switching applications. The Finder Bistable Relay (MPN: 20.23.9.024.4000) offers a 16A rating and dual contacts (1 NO, 1 NC) within a slim 17.4mm module, ideal for space-constrained control panels. While highly versatile with AC/DC coils and sequence control, users should be aware of its specific 24V DC coil voltage requirement.

All features

Series20
Model Part Number20.23.9.024.4000
BrandFinder

Extended Product Information

FAQs

What is the primary advantage of a bistable relay?

The main advantage is its ability to maintain its last switched state (ON or OFF) without continuous power consumption, making it highly energy-efficient for certain applications.

Can this relay be used with AC control voltage?

This specific model (20.23.9.024.4000) is designed for a 24V DC coil. Other variants in the Finder 20 series may support AC coils, but always check the specific product documentation.

How do I connect an illuminated pushbutton?

You will need the optional Finder type 026.00 adaptor. Connect the pushbutton and the relay according to the adaptor's specific wiring diagram.

What does '1 NO + 1 NC contact' mean?

It means the relay has two sets of contacts. One set is 'Normally Open' (NO), meaning it's open (off) when the relay is de-energized and closes (on) when energized. The other set is 'Normally Closed' (NC), meaning it's closed (on) when de-energized and opens (off) when energized.

What is the physical width of this relay?

The relay module is 17.4 mm wide, making it a single-module width device suitable for compact installations.

Are the contacts safe for the environment?

Yes, the contacts are cadmium-free, which is a more environmentally conscious material compared to older relay technologies.

Can I use this relay for high-speed switching?

Bistable relays are generally designed for maintaining states rather than high-frequency switching. For high-speed applications, other types of relays or solid-state devices may be more appropriate.

Troubleshooting

Relay does not switch state when coil voltage is applied.

Verify the coil voltage is exactly 24V DC and correctly connected to terminals A1/A2. Check for any obstructions on the mechanical indicator or test button.

Contacts are not making or breaking connection.

Ensure the load wiring is correctly terminated on the NO and NC contacts. Check that the relay is receiving the correct coil voltage to initiate a state change. Inspect contacts for visible damage.

Relay switches, but fails to hold state after power is removed.

Confirm the unit is a bistable relay and not a monostable type. Ensure the correct coil voltage is supplied; bistable relays require a pulse to switch states, and may need a continuous voltage depending on the specific sequence or model variation.

Test button is stuck or unresponsive.

Gently try to dislodge the test button. If it remains stuck, the unit may require replacement as internal components could be compromised.

Pros and Cons

Pros

  • Space-saving 17.4mm modular design.
  • Energy efficient due to bistable operation.
  • Versatile switching with both NO and NC contacts.
  • Suitable for DIN rail mounting (EN 60715).
  • Includes convenient test button and status indicator.

Cons

  • Requires a specific 24V DC coil voltage.
  • Optional adaptor needed for illuminated pushbutton integration.
  • Not designed for high-frequency switching applications.

Setup, Compatibility & Care

Setup:

  1. Mount the relay securely on a 35 mm DIN rail (EN 60715).
  2. Connect the control circuit to the appropriate coil terminals (A1/A2) ensuring the correct 24V DC polarity.
  3. Wire the load circuit through the normally open (NO) and normally closed (NC) contacts.
  4. If using illuminated pushbuttons, connect the Finder type 026.00 adaptor as per its specific instructions.

Compatibility:

  • Designed for 35mm DIN rail mounting.
  • Requires a 24V DC control voltage.
  • Compatible with Finder type 026.00 adaptor for illuminated pushbuttons.
  • Suitable for AC or DC coil inputs (though this specific model is 24V DC).

Care:

  • Ensure the relay is installed in a clean, dry environment, free from excessive dust or vibration.
  • Periodically check wiring connections for tightness.
  • Avoid exposing the relay to extreme temperatures or humidity levels outside its operating range.
  • The contacts are cadmium-free, requiring no special handling beyond standard electrical safety practices.

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