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Finder 22.21.8.230.4000 – 22 Series Modular monostable relays
Finder 22.21.8.230.4000 modular monostable installation relay with a 230 V AC coil, 20 A normally open contact and compact 17.4 mm DIN rail housing for electrical load switching and building automation applications.
£20.11
Why Choose the Finder 22.21.8.230.4000 Modular Installation Relay?
The Finder 22.21.8.230.4000 is a compact 20 A modular installation relay designed for dependable electrical load switching in lighting control, building automation and electrical distribution applications. Part of the Finder 22 Series, this monostable relay features a 230 V AC operating coil and a single normally open contact, providing straightforward remote control of compatible electrical circuits.
With its 1 NO (SPST-NO) contact configuration, the Finder 22.21.8.230.4000 allows connected loads to be switched using a separate control signal. Its 20 A rated contact current and silver tin oxide (AgSnO2) contact material make it a practical choice for suitably rated lighting and electrical switching applications.
The relay features a slim 17.4 mm modular housing designed for installation on a standard 35 mm DIN rail. Its compact construction makes it suitable for distribution boards, electrical cabinets and building control panels where efficient use of installation space is important.
Key Advantages
- 20 A rated switching current for compatible electrical loads.
- 230 V AC operating coil suitable for mains-voltage control circuits.
- Single normally open contact for straightforward remote switching.
- Monostable operation automatically returns the contact to its normal position when the coil is de-energised.
- AgSnO2 contact material for reliable electrical switching performance.
- 17.4 mm modular width helps conserve space inside electrical enclosures.
- Convenient installation onto a standard 35 mm DIN rail.
- Suitable for lighting control, electrical distribution and building automation systems.
- Provides electrical separation between the control and switched-load circuits.
- Part of Finder's established 22 Series modular relay range.
Key Features
- Finder 22 Series modular installation relay.
- Type 22.21 single-pole monostable relay.
- 1 NO (SPST-NO) contact configuration.
- 20 A rated contact current.
- 230 V AC rated coil voltage.
- 250 V AC rated contact voltage.
- 400 V AC maximum switching voltage.
- Silver tin oxide (AgSnO2) contact material.
- Electromagnetic monostable switching operation.
- Compact 17.4 mm modular construction.
- Direct mounting onto 35 mm DIN rail to EN 60715.
- IP20 protection rating.
- Suitable for compatible lighting and electrical load switching.
- Designed for professional electrical installation and automation applications.
Reliable Modular Switching for Electrical Control and Building Automation
Modular installation relays are widely used to control electrical equipment from separate switching circuits. The Finder 22.21.8.230.4000 provides a practical solution for applications where lighting or other compatible electrical loads must be operated remotely using a 230 V AC control signal.
When the relay coil is energised, its electromagnetic mechanism closes the normally open contact, allowing current to flow through the connected load circuit. When the coil supply is removed, the relay returns to its unenergised state and the contact opens. This monostable operating principle makes the device suitable for electrical systems requiring predictable switching behaviour.
The relay's 20 A contact rating and AgSnO2 contact material support switching applications within the manufacturer's specified operating limits. Its slim modular housing also allows installation alongside circuit protection devices, timers and other DIN rail-mounted control components.
For reliable operation, the connected electrical load must be assessed against the applicable contact ratings and utilisation requirements. Loads with significant starting or inrush currents, including motors and certain LED drivers, may require additional consideration or appropriately rated switching equipment.
Typical Applications
- Residential and commercial lighting control.
- Electrical distribution board switching.
- Building automation and control systems.
- Remote switching of compatible electrical loads.
- Commercial office electrical installations.
- Industrial electrical control panels.
- Automatic lighting control circuits.
- Electrical refurbishment and distribution board upgrades.
- DIN rail-mounted relay replacement applications.
- Control of appropriately rated building services equipment.
Technical Specifications
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| Device Type | Modular contactor | |
|---|---|---|
| Coil Type | AC | |
| Coil Voltage Range | 200–250 V | |
| Manufacturer | Finder | |
| Series | 22 Series | |
| Type | 22.21 | |
| Model | 22.21.8.230.4000 | |
| Manufacturer part number | 22.21.8.230.4000 | |
| Product type | Modular installation relay | |
| Relay operation | Monostable | |
| Number of poles | 1 | |
| Contact configuration | 1 NO (SPST-NO) | |
| Rated coil voltage | 230 V AC | |
| Coil supply type | AC | |
| Rated contact current | 20 A | |
| Rated contact voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| Contact material | Silver tin oxide (AgSnO2) | |
| Protection rating | IP20 | |
| Housing width | 17.4 mm | |
| Mounting method | 35 mm DIN rail | |
| DIN rail standard | EN 60715 | |
| Primary application | Electrical load switching and installation control |
Frequently Asked Questions
What is the Finder 22.21.8.230.4000 used for?
The Finder 22.21.8.230.4000 is a modular installation relay designed for remote switching of compatible electrical loads. It is suitable for lighting control, electrical distribution and building automation applications.
What coil voltage does the Finder 22.21.8.230.4000 require?
The relay uses a 230 V AC operating coil. Applying the correct control voltage energises the relay and closes its normally open contact.
What is the contact rating of the Finder 22.21.8.230.4000?
The relay has a 20 A rated contact current and a 250 V AC rated contact voltage, with a maximum switching voltage of 400 V AC. Actual load suitability depends on the relevant switching characteristics and utilisation ratings.
Does the Finder 22.21.8.230.4000 have normally open or normally closed contacts?
The Finder 22.21.8.230.4000 features one normally open (1 NO) contact. This contact closes when the 230 V AC coil is energised and returns to the open position when the coil is de-energised.
How is the Finder 22.21.8.230.4000 installed?
The relay is designed for mounting onto a standard 35 mm DIN rail to EN 60715. Its 17.4 mm modular width makes it suitable for electrical distribution boards and control panels where installation space is limited.
Trusted by Electrical Installers and Automation Professionals Worldwide
Finder 22 Series modular installation relays provide practical solutions for electrical distribution, lighting control and building automation applications. The Finder 22.21.8.230.4000 combines a 230 V AC operating coil, 20 A normally open contact and compact DIN rail construction to support dependable switching in professional electrical installations.
