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Finder 20 Bistable Relay - 20.22.9.024.4000

Finder 20 Bistable Relay - 20.22.9.024.4000

Finder 20 bistable relay, (WxDxH) 17.5x55x60mm, coil voltage 1 21.6 - 26.4V, coil voltage type 1 D...

Best current price£23.88from Tameson UK

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Product Information

Full details

The Finder 20.22.9.024.4000 is a bistable relay designed for industrial and automation applications requiring reliable switching. It is ideal for electricians and control system integrators who need a compact, DIN rail mountable relay with two normally open contacts and stable states without continuous coil power. A key benefit is its power-saving operation, as it only requires a pulse to change state. However, users must ensure the coil voltage is precisely matched to the supply to prevent damage.

All features

Series20
Model Part Number20.22.9.024.4000
BrandFinder

Extended Product Information

FAQs

What is a bistable relay?

A bistable relay is a type of relay that maintains its last switched position (on or off) even after the control power is removed from its coil. It requires a pulse of power to change its state.

What is the difference between bistable and monostable relays?

A monostable relay returns to its default state when the control power is removed. A bistable relay stays in its last position until a new control pulse is applied.

What is the coil voltage for this relay?

The coil voltage for the Finder 20.22.9.024.4000 is 24V DC.

Can I use this relay for AC loads?

Yes, this relay can be used for AC loads up to its rated switching current of 16A. Ensure the AC voltage is compatible with the load requirements.

How many contacts does this relay have, and what type are they?

This relay has two normally open (NO) contacts. They close when the relay is energized by a control pulse.

What is the maximum switching current?

The nominal switching current is 16A. For loads with a low power factor (cos phi = 0.6), the maximum switching current is 12A.

How is this relay mounted?

It is designed for mounting on a standard 35mm DIN rail.

Does this relay require continuous power to stay on?

No, as a bistable relay, it only requires a momentary pulse to switch states and does not consume power in the coil to maintain its position.

Troubleshooting

Relay does not switch when coil voltage is applied

Verify the coil voltage is exactly 24V DC. Check polarity and ensure connections to terminals A1 and A2 are secure. Confirm the control circuit is functioning correctly.

Contacts do not close or open properly

Ensure the load current does not exceed the 16A rating. Check for any obstructions preventing contact movement. If manual operation is also affected, the relay may be damaged.

Relay gets hot or emits a burning smell

Immediately disconnect power. The relay may be overloaded, wired incorrectly, or internally damaged. Check the load current and verify compatibility. Replace the unit if damaged.

Relay does not maintain its state after power is removed

This unit is bistable and requires a pulse to switch. Ensure you are applying a pulse, not continuous power. If it reverts to a default state immediately after the pulse, check if the correct pulse duration is being sent or if the unit is faulty.

Pros and Cons

Pros

  • Energy efficient due to bistable design (no holding power required).
  • Compact size saves valuable space in control cabinets.
  • Reliable switching with two NO contacts for versatile control.
  • Easy installation on standard DIN rails.
  • Manual operation allows for convenient testing and local control.

Cons

  • Requires precise 24V DC coil voltage; incorrect voltage can cause damage.
  • Only offers Normally Open contacts; not suitable for applications requiring Normally Closed functions directly.
  • Limited to single-phase AC or DC loads within its current rating.
  • Not suitable for high-frequency switching applications requiring rapid state changes.

Setup, Compatibility & Care

Setup:

  1. Mount the relay securely onto a standard 35mm DIN rail.
  2. Connect the control voltage (24V DC) to the coil terminals (typically marked A1 and A2). Ensure correct polarity.
  3. Wire the load circuits to the two normally open (NO) contacts (typically marked 1-2 and 3-4).
  4. Verify all connections before applying power.

Compatibility:

  • Control Voltage: Compatible with 24V DC power supplies. Ensure the supply voltage is within the specified range of 21.6 - 26.4V DC.
  • Load: Suitable for AC or DC loads up to 16A. For inductive loads, ensure appropriate surge suppression is used.
  • Mounting: Designed exclusively for 35mm DIN rail mounting.

Care:

  • Keep the relay clean and free from dust and moisture.
  • Avoid exposing the relay to excessive heat or direct sunlight.
  • Regularly check wiring connections for tightness and signs of wear.
  • Do not attempt to open or repair the sealed unit.

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