Why Choose the Finder 7S.34.9.110.4220 Forcibly Guided Safety Relay?
The Finder 7S.34.9.110.4220 is a professional 110 V DC modular safety relay with forcibly guided contacts, designed for industrial machinery, automation systems and safety-related control circuits. Part of the Finder 7S Series, this four-pole relay features 2 normally open (NO) and 2 normally closed (NC) contacts, a 6 A rated contact current and screw terminal connections.
Forcibly guided contacts are particularly valuable in safety-related electrical systems because they maintain a defined mechanical relationship between normally open and normally closed contacts. When used with suitable external monitoring, this contact arrangement can help detect certain relay failures, including welded contacts.
The 110 V DC coil makes the Finder 7S.34.9.110.4220 suitable for compatible industrial control systems operating at this voltage. Its 2 NO + 2 NC configuration provides both switching and feedback contact paths, making it useful for monitored control arrangements.
With silver tin oxide (AgSnO2) contacts, a 250 V AC rated switching voltage, LED coil status indication and a compact 22.5 mm DIN rail housing, this relay is designed for professional industrial panel installations.
The Finder 7S.34.9.110.4220 is suitable for machine builders, automation engineers, electrical panel manufacturers and maintenance professionals who require a reliable forcibly guided relay component for appropriately engineered safety-related systems.
Key Advantages
- Forcibly guided contacts: Support detection of specified contact faults in properly designed monitoring circuits.
- 110 V DC coil: Designed for compatible industrial DC control supplies.
- 2 NO + 2 NC contact arrangement: Provides two normally open switching paths and two normally closed paths.
- 6 A contact rating: Suitable for appropriately rated industrial switching loads.
- 250 V AC switching voltage: Supports compatible AC control applications.
- Silver tin oxide contacts: Provide industrial-grade contact construction.
- Class A forcibly guided design: Conforms to the contact guidance principles of EN 61810-3.
- Screw terminal connections: Provide secure conventional conductor termination.
- 35 mm DIN rail mounting: Enables convenient integration into electrical control cabinets.
- 22.5 mm housing width: Helps conserve panel space.
- LED coil status indicator: Makes coil energisation easier to identify during commissioning.
- Wide operating temperature range: Rated from -40 °C to +70 °C.
- 10 million mechanical operations: Designed for long mechanical service life.
- IP20 protection: Suitable for installation inside appropriately rated electrical enclosures.
- Multiple feedback paths: The two normally closed contacts provide flexibility for suitable monitoring circuits.
- Finder 7S Series construction: Designed for safety-related control applications.
Key Features
- Manufacturer: Finder.
- Product series: 7S Series.
- Manufacturer part number: 7S.34.9.110.4220.
- Alternative product code: 7S3491104220.
- Product type: Modular relay with forcibly guided contacts.
- Nominal coil voltage: 110 V DC.
- Coil operating range: 77 to 138 V DC.
- Contact arrangement: 2 NO + 2 NC.
- Number of contacts: 4.
- Rated contact current: 6 A.
- Rated switching voltage: 250 V AC.
- Rated AC1 load: 1,500 VA.
- Contact material: Silver tin oxide (AgSnO2).
- Rated coil current: 11.6 mA.
- Rated coil power: 1.4 W.
- Typical operate time: 12 ms.
- Typical release time: 10 ms.
- Mechanical durability: 10 million operations.
- Electrical endurance: 100,000 operations at the specified AC1 rated load.
- Terminal type: Screw / box-clamp terminals.
- Mounting: 35 mm DIN rail.
- Housing dimensions: 22.5 × 86.2 × 100.3 mm.
- Ingress protection: IP20.
- Operating temperature: -40 °C to +70 °C.
- Coil status indication: LED.
- EAN / GTIN: 8012823420677.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Finder |
| Series | 7S Series |
| Product family | 7S.34 |
| Manufacturer part number | 7S.34.9.110.4220 |
| Alternative product code | 7S3491104220 |
| EAN / GTIN | 8012823420677 |
| Product type | Modular relay with forcibly guided contacts |
| Nominal coil voltage | 110 V DC |
| Coil operating voltage range | 77 to 138 V DC |
| Rated coil current | 11.6 mA |
| Rated coil power | 1.4 W |
| Contact configuration | 2 NO + 2 NC |
| Number of contacts | 4 |
| Rated contact current | 6 A |
| Maximum peak contact current | 15 A |
| Rated switching voltage | 250 V AC |
| Rated load AC1 | 1,500 VA |
| Rated current AC15 at 230 V AC | 5 A |
| Contact material | Silver tin oxide (AgSnO2) |
| Contact guidance | Class A forcibly guided, EN 61810-3 |
| Operate time | 12 ms |
| Release time | 10 ms |
| Mechanical durability | 10,000,000 operations |
| Electrical endurance at rated AC1 load | 100,000 operations |
| Rated insulation voltage | 250 V |
| Pollution degree | 2 |
| Terminal connection | Screw / box-clamp |
| Recommended wire stripping length | 9 mm |
| Specified terminal tightening torque | 0.8 Nm |
| Mounting | 35 mm DIN rail, EN 60715 |
| Housing width | 22.5 mm |
| Housing height | 86.2 mm |
| Housing depth | 100.3 mm |
| Ingress protection | IP20 |
| Operating temperature | -40 °C to +70 °C |
| Coil status indication | LED |
| Country of origin | Italy |
The key feature of the Finder 7S.34.9.110.4220 is its Class A forcibly guided contact construction, designed according to EN 61810-3.
Forcibly guided contacts are mechanically linked so that the normally open and normally closed contacts maintain a defined relationship under specified operating and fault conditions.
If a normally open contact becomes welded closed, the linked normally closed contacts are prevented from returning to their normal closed positions in the defined fault condition. This allows a correctly designed external monitoring circuit to detect the discrepancy.
The relay's 2 NO + 2 NC configuration provides two normally open contacts for switching and two normally closed contacts that may be incorporated into suitable feedback or diagnostic circuits.
Finder's 7S Series documentation identifies these relays as evaluated for functional safety applications up to SIL 2 and PL d, subject to the complete system architecture and application requirements. The relay alone does not establish the achieved safety integrity level or performance level of a machine.
System designers must assess the complete safety function, including input devices, control logic, diagnostics, fault handling, switching components and validation.
The Finder 7S.34.9.110.4220 features a four-contact arrangement consisting of two normally open and two normally closed contacts.
The normally open contacts can be used for appropriately rated switching functions, while the normally closed contacts can provide feedback or monitoring paths within a correctly engineered control system.
The relay has a 6 A rated contact current and a 250 V AC rated switching voltage. Its 1,500 VA AC1 load rating provides a reference for resistive AC switching applications.
The contacts use silver tin oxide (AgSnO2), a material commonly employed in industrial electromechanical switching devices.
Electrical contact life depends on the switched voltage, current, utilisation category and operating frequency. Loads such as motors, solenoids and other inductive devices may require additional consideration.
The Finder 7S Series documentation specifies 10 million mechanical operations and 100,000 electrical operations at the rated AC1 load for this relay family.
110 V DC Coil Operation and LED Status Indication
The Finder 7S.34.9.110.4220 uses a 110 V DC nominal coil, suitable for compatible industrial control power supplies.
The manufacturer's coil data specifies an operating range of 77 to 138 V DC, a rated coil current of 11.6 mA and a rated coil power consumption of 1.4 W.
The relay has a typical operate time of 12 ms and a release time of 10 ms. These values describe relay operation under specified conditions and do not represent the response time of a complete machinery safety function.
An integrated LED coil status indicator provides a convenient visual indication of coil energisation, assisting commissioning and maintenance personnel.
The coil should be connected according to the manufacturer's wiring diagram, with the correct voltage, polarity and protective arrangements for the application.
DIN Rail Installation with Screw Terminal Connections
The Finder 7S.34.9.110.4220 is designed for installation on a 35 mm DIN rail according to EN 60715.
Its 22.5 mm housing width supports efficient use of space in industrial electrical cabinets. The approximate overall housing dimensions are 22.5 × 86.2 × 100.3 mm.
The relay uses screw / box-clamp terminals. Finder specifies a 9 mm conductor stripping length and a 0.8 Nm tightening torque for the relevant terminal arrangement.
The normally open and normally closed contact connections should be identified from the manufacturer's connection diagram before wiring. The coil terminals are marked A1 and A2.
Where the relay is incorporated into a safety-related control system, commissioning should verify the intended switching sequence, feedback monitoring, fault response and restart behaviour.
The device has an IP20 protection rating and must be installed within a suitable electrical enclosure. Installation and maintenance should be performed by competent personnel following appropriate isolation procedures.
Typical Applications
- Industrial machinery safety-related control circuits.
- Emergency-stop systems incorporating suitable external monitoring.
- Safety relay expansion and interface circuits.
- Machine control panels.
- Industrial automation cabinets.
- Contact feedback and diagnostic monitoring circuits.
- Industrial process control systems.
- Automated production machinery.
- Industrial conveyor systems.
- Packaging and processing machinery.
- Material handling equipment.
- Hoists and lifting equipment control systems.
- Industrial equipment refurbishment and maintenance.
- 110 V DC control installations.
- Applications requiring two normally open and two normally closed forcibly guided contacts.
