Why Choose the Finder RR.24.9.250.9021 Fast Switching Relay with 90.21 Socket?
The Finder RR.24.9.250.9021 is an industrial fast switching electromechanical relay supplied with a Finder 90.21 socket, designed for control applications requiring rapid operation, multiple independent contacts and dependable switching performance. Part of the Finder RR Series, this relay assembly combines a 220–250 V DC coil, 3 normally open (NO) contacts plus 1 changeover (CO) contact and an 8 A contact rating.
With an operating time of 3 ms or less, the Finder RR.24.9.250.9021 is particularly suited to industrial control and signalling applications where fast relay response is important. Its combination of three normally open contacts and one changeover contact provides flexible control of multiple circuits, including auxiliary switching, equipment status indication and interlocking functions.
The 9021 configuration includes the Finder 90.21 relay socket, providing a convenient plug-in installation arrangement. The relay features an 11-pin connection format, LED coil supply indication and AgCdO contact material, making it a practical choice for suitably specified industrial electrical control systems.
Key Advantages
- Fast switching performance: Operating time of 3 ms or less for applications requiring rapid relay response.
- 220–250 V DC coil: Designed for compatible higher-voltage DC control circuits.
- Four-contact configuration: Three normally open contacts plus one changeover contact provide flexible switching arrangements.
- 8 A contact rating: Supports appropriately rated industrial control and auxiliary loads.
- Finder 90.21 socket included: Supplied as a relay and socket assembly for convenient installation.
- Plug-in relay construction: Allows relay replacement without disconnecting the socket's fixed wiring.
- LED coil indication: Provides a visual reference when the relay control supply is present.
- AgCdO contacts: Designed for electrical switching applications requiring suitable contact performance.
- 35 mm DIN rail installation: The supplied socket supports standard industrial control panel mounting.
- IP20 protection: Provides basic protection against finger access when correctly assembled and installed.
- Wide operating temperature range: Suitable for specified industrial environments.
- Modular construction: Supports convenient maintenance and organised electrical panel design.
Key Features
- Manufacturer: Finder.
- Series: RR Series.
- Model: RR.24.9.250.9021.
- Product type: Fast switching industrial relay with socket.
- Relay configuration: Plug-in electromechanical relay.
- Coil voltage: 220–250 V DC.
- Contact arrangement: 3 NO + 1 CO.
- Number of contact sets: 4.
- Rated contact current: 8 A.
- Operating time: ≤3 ms.
- Contact material: Silver cadmium oxide (AgCdO).
- Coil indication: LED.
- Relay connection: 11-pin plug-in format.
- Included socket: Finder 90.21.
- Mounting: 35 mm DIN rail using the supplied socket.
- Socket termination: Screw terminals.
- Protection rating: IP20.
- Operating temperature: −40 to +55 °C.
- Suitable for industrial automation, auxiliary switching and electrical control systems.
Technical Specifications
- Manufacturer: Finder
- Series: RR Series
- Manufacturer part number: RR.24.9.250.9021
- EAN / GTIN: 8012823399119
- Product category: Industrial fast switching relays
- Product type: Plug-in electromechanical relay and socket assembly
- Relay type: RR.24
- Coil supply type: DC
- Coil voltage: 220–250 V DC
- Contact configuration: 3 normally open + 1 changeover
- Contact notation: 3 NO + 1 CO / 3PST-NO + SPDT
- Number of poles: 4
- Rated contact current: 8 A
- Maximum switching voltage: 400 V AC
- Operating time: ≤3 ms
- Contact material: AgCdO
- Coil supply indication: Integrated LED
- Relay connection format: 11-pin plug-in
- Included socket: Finder 90.21
- Socket connection type: Screw terminals
- Mounting method: 35 mm DIN rail, EN 60715
- Degree of protection: IP20
- Operating temperature range: −40 to +55 °C
- Contact terminal arrangement: Three normally open contact circuits and one changeover contact circuit
- Coil terminals: A1 (+) and A2 (−)
- Ordering option: 9021 – relay supplied with Finder 90.21 socket
- Application: Fast auxiliary switching, industrial automation and electrical signalling
Reliable Fast Switching for Industrial Automation and Control
The Finder RR.24.9.250.9021 is designed for applications where relay response time and multiple contact outputs are important. Its ≤3 ms operating time enables rapid energisation of the contact system, supporting suitable industrial switching, signalling and auxiliary control functions.
The relay's 3 NO + 1 CO contact arrangement provides four independent contact sets. The three normally open contacts close when the relay operates, while the changeover contact transfers between its normally closed and normally open positions. This configuration allows one control signal to operate several electrically separate circuits, subject to the relay's switching ratings.
The 220–250 V DC coil is intended for correctly polarised DC control supplies. The relay's LED indication provides a convenient visual reference during commissioning and maintenance, helping technicians identify when the appropriate coil voltage is present. LED illumination does not independently confirm the mechanical position or electrical continuity of the relay contacts.
Supplied with the Finder 90.21 socket, the relay offers a practical installation arrangement for 35 mm DIN rail control panels. The socket's screw terminals provide connections to the external wiring, while the plug-in relay can be removed or replaced during maintenance without disturbing the fixed socket connections.
The AgCdO contact material supports suitable electrical switching applications. Contact ratings must be assessed against the actual load type, switching voltage, inrush current and required electrical endurance. The stated 8 A rating should not be assumed to apply unchanged to every DC or highly inductive load.
For reliable operation, the relay should be installed within its specified environmental and electrical limits, with appropriate circuit protection and consideration of any required coil suppression or contact protection.
Typical Applications
- Fast industrial relay switching applications.
- 220–250 V DC auxiliary control circuits.
- Industrial automation and electrical control panels.
- PLC and controller-operated relay interfaces.
- Machinery control and auxiliary switching.
- Multiple-circuit control and signalling.
- Industrial equipment status indication.
- Electrical interlocking and sequencing circuits.
- Manufacturing and production machinery.
- Industrial process control installations.
- Power distribution auxiliary control systems.
- Electrical commissioning and functional testing.
- OEM control panel manufacturing.
- Maintenance and replacement of compatible Finder RR Series relay assemblies.
