Why Choose the Finder 7S.14.9.110.4220 Safety Relay Module?
The Finder 7S.14.9.110.4220 is a professional 110 V DC safety relay module with forcibly guided contacts, designed for industrial automation, machinery control and safety-related electrical switching applications. Part of the Finder Series 7S, this DIN rail-mounted relay combines a 2 normally open (NO) + 2 normally closed (NC) contact configuration with a 6 A contact rating and 250 V AC nominal switching voltage.
Its Class A forcibly guided contacts provide a mechanically linked arrangement that supports the detection of certain relay faults, including welded contacts, when used with an appropriately designed monitoring circuit. The balanced 2 NO + 2 NC configuration is particularly useful where controlled switching and independent contact feedback are required.
The Finder 7S.14.9.110.4220 features silver tin oxide (AgSnO) contacts, screwless spring-clamp terminals, an integrated LED coil indicator and a compact 22.5 mm-wide housing. It is designed for standard DIN rail installation in industrial control panels and electrical cabinets.
With a 110 V DC coil, 1.4 W coil power consumption, IP20 protection rating and an operating temperature range of −40 to +70 °C, this Finder safety relay provides a dependable switching component for properly engineered industrial safety-related systems.
Key Advantages
- Class A forcibly guided contacts: Support detection of certain contact faults within suitable safety monitoring circuits.
- 2 NO + 2 NC contact configuration: Provides two normally open switching contacts and two normally closed contacts for feedback or other control functions.
- 110 V DC coil: Suitable for industrial control systems using a compatible DC supply.
- 6 A contact rating: Supports a range of appropriately rated industrial control loads.
- 250 V AC switching voltage: Enables use in suitable AC switching circuits.
- Silver tin oxide contacts: Provide robust contact performance for industrial relay applications.
- Screwless spring-clamp terminals: Simplify wiring and help provide secure electrical connections.
- Integrated LED indication: Makes coil energisation easy to identify during commissioning and maintenance.
- Compact DIN rail construction: Helps conserve space in electrical control cabinets.
- Defined switching times: Supports predictable operation within properly designed control systems.
- Wide operating temperature range: Suitable for demanding industrial environments.
- Finder Series 7S construction: Designed specifically for applications requiring forcibly guided relay contacts.
Key Features
- Finder Series 7S relay module with forcibly guided contacts.
- Four-contact relay construction.
- 2 normally open and 2 normally closed contacts.
- Class A forcibly guided contact arrangement.
- 110 V DC nominal coil voltage.
- 6 A rated contact current.
- 250 V AC nominal switching voltage.
- Silver tin oxide (AgSnO) contact material.
- Approximately 11.6 mA rated coil current.
- Approximately 1.4 W rated coil power.
- Approximately 9.5 kΩ coil resistance.
- Approximately 12 ms operate time.
- Approximately 10 ms release time.
- Integrated illuminated coil status indicator.
- Screwless spring-clamp electrical terminals.
- 35 mm DIN rail mounting.
- Compact 22.5 mm nominal housing width.
- IP20 ingress protection rating.
- −40 to +70 °C ambient operating temperature.
- Suitable for integration into correctly designed safety-related control systems.
Technical Specifications
- Manufacturer: Finder
- Series: 7S
- Product code: 7S.14.9.110.4220
- Product type: Safety relay module with forcibly guided contacts
- Contact configuration: 2 NO + 2 NC
- Number of contacts: 4
- Contact arrangement: 4PST, 2 Form A + 2 Form B
- Contact guidance: Class A forcibly guided
- Contact guidance standard: EN 61810-3
- Nominal coil voltage: 110 V DC
- Coil operating range: 77 to 138 V DC
- Must-operate voltage: 77 V DC
- Must-release voltage: 11 V DC
- Rated coil current: 11.6 mA
- Rated coil power: 1.4 W
- Coil resistance: Approximately 9.5 kΩ
- Rated contact current: 6 A
- Nominal switching voltage: 250 V AC
- Contact material: Silver tin oxide (AgSnO)
- Operate time: Approximately 12 ms
- Release time: Approximately 10 ms
- Terminal type: Screwless spring-clamp
- Coil status indication: Integrated LED
- Mounting method: DIN rail
- DIN rail size: 35 mm
- Nominal housing width: 22.5 mm
- Housing height: Approximately 78.8 mm
- Housing depth: Approximately 96 mm
- Ingress protection: IP20
- Operating temperature: −40 to +70 °C
- RoHS compliance: Yes
- Country of origin: Italy
The defining feature of the Finder 7S.14.9.110.4220 is its Class A forcibly guided contact technology. Unlike ordinary relay contacts, the normally open and normally closed contacts are mechanically linked so that they cannot simultaneously assume their closed positions under specified contact fault conditions.
This construction is especially useful in safety-related control systems where the condition of a switching device must be monitored. For example, if a normally open contact becomes welded closed, the corresponding mechanically linked normally closed contacts cannot return to their normal closed positions.
A suitable safety controller or feedback monitoring circuit can detect this discrepancy and respond according to the system's safety design.
The relay's 2 NO + 2 NC configuration provides a balanced arrangement for switching and monitoring. Two normally open contacts can be allocated to controlled outputs, while the normally closed contacts may be incorporated into appropriate feedback circuits.
The precise use of each contact depends on the application, and the complete system must be designed to achieve the required level of functional safety.
Important: The Finder 7S.14.9.110.4220 is a relay module with forcibly guided contacts, not a standalone safety controller. Its use does not independently establish a particular Safety Integrity Level or Performance Level for the complete installation.
110 V DC Coil Operation for Industrial Control Systems
The Finder 7S.14.9.110.4220 operates using a 110 V DC nominal coil supply, making it suitable for industrial installations and control systems where this DC voltage is available.
The specified coil operating range is 77 to 138 V DC. At nominal voltage, the relay has a rated coil current of approximately 11.6 mA and a rated power consumption of approximately 1.4 W.
The coil has an approximate resistance of 9.5 kΩ, and the relay's documented must-release voltage is 11 V DC.
These characteristics should be considered when selecting the power supply and controlling device. The coil voltage must remain within the manufacturer's permitted limits, and the control circuit should account for supply fluctuations and any external protective components.
Versatile 2 NO + 2 NC Contact Configuration
The Finder 7S.14.9.110.4220 features four mechanically linked contacts arranged as two normally open contacts and two normally closed contacts.
This configuration offers flexibility for industrial control systems requiring both switched outputs and feedback monitoring. For example, the normally open contacts may be used for suitable switching functions, while the normally closed contacts can provide feedback to a compatible monitoring circuit.
Each contact is rated at 6 A, with a nominal switching voltage of 250 V AC. The permitted load depends on the type of circuit, switching frequency and applicable contact utilisation category.
The contacts use silver tin oxide (AgSnO), a contact material commonly employed in industrial switching applications.
For circuits involving inductive loads, high inrush currents or frequent switching, the manufacturer's load-specific switching ratings and electrical endurance information should be consulted before installation.
Compact DIN Rail Installation with Spring-Clamp Terminals
The Finder 7S.14.9.110.4220 is designed for mounting on a standard 35 mm DIN rail. Its compact housing measures approximately 22.5 mm wide, 78.8 mm high and 96 mm deep, making it suitable for control cabinets where installation space is limited.
The relay uses screwless spring-clamp terminals to provide electrical connections without conventional terminal screws. This supports efficient panel assembly and convenient maintenance when conductors are prepared and installed in accordance with Finder's instructions.
An integrated LED indicator provides a visual indication of coil energisation, helping maintenance personnel identify the relay's commanded electrical state during commissioning and troubleshooting.
The LED does not independently confirm the condition of every contact, so safety-related monitoring must be provided by the appropriate control system.
With an IP20 ingress protection rating, the relay should be installed within a suitable electrical enclosure. Its −40 to +70 °C operating temperature range supports use in a broad range of industrial environments.
Functional Safety and Machinery Control Considerations
The Finder 7S.14.9.110.4220 is intended for use as a component within safety-related control systems. Its forcibly guided contacts support diagnostic monitoring, but the overall safety performance depends on the complete electrical and control architecture.
When designing a machinery safety circuit, engineers should consider the required Performance Level or Safety Integrity Level, fault detection arrangements, contact loading, diagnostic coverage and response to component failures.
For applications involving emergency stops, machine guards, safety interlocks or monitored outputs, the relay should be incorporated into an appropriately designed and validated safety system.
Its 2 NO + 2 NC configuration can be useful in systems requiring multiple monitored switching paths, but the presence of multiple contacts does not automatically create a redundant or fault-tolerant safety function.
The final installation should be assessed against applicable standards, including EN ISO 13849-1 or IEC 61508 where relevant, by a competent professional.
Typical Applications
- Industrial machinery safety-related control circuits.
- Safety relay interface and expansion circuits.
- Machine guard monitoring and interlock systems.
- Emergency-stop control circuits within validated safety architectures.
- Industrial automation and PLC control panels.
- Monitored relay switching circuits.
- Safety feedback and contact monitoring applications.
- Manufacturing and production machinery.
- Industrial conveyor and material handling systems.
- Packaging and processing equipment.
- Industrial process control installations.
- 110 V DC control supply systems.
- DIN rail-mounted electrical control cabinets.
- Applications requiring 2 NO + 2 NC forcibly guided contacts.
