Finder 7S.12.9.012.5110 – 7S Series Relay modules with forcibly guided contacts

Why Choose the Finder 7S.12.9.012.5110 Safety Relay Module?

The Finder 7S.12.9.012.5110 is a professional 12 V DC safety relay module with forcibly guided contacts, designed for industrial machinery, automation systems and safety-related electrical control applications. Part of the Finder Series 7S, this compact DIN rail-mounted relay module features a 1 normally open (NO) + 1 normally closed (NC) contact configuration, a 6 A contact rating and spring-clamp terminals for reliable electrical connections.

Engineered for applications where contact reliability and predictable switching behaviour are essential, the Finder 7S.12.9.012.5110 incorporates Class A forcibly guided contacts in accordance with EN 61810-3. This mechanically linked contact arrangement helps prevent the normally open and normally closed contacts from simultaneously assuming their closed positions in the event of a contact welding fault, supporting fault detection within an appropriately designed safety-related control system.

The module features a 12 V DC operating coil, LED coil status indication, gold-plated silver-nickel contacts and a compact 22.5 mm-wide housing. Designed for installation on a standard 35 mm DIN rail, it is suitable for machinery safety circuits, industrial automation panels and control systems requiring dependable relay switching with mechanically linked contacts.

With an operating temperature range of −40 to +70 °C, IP20 protection and a mechanical endurance of 10 million operations, the Finder 7S.12.9.012.5110 offers a practical solution for safety-related industrial control applications.

Key Advantages

• Forcibly guided contact technology supports reliable fault detection in appropriately designed safety circuits.
• Class A mechanically linked contacts in accordance with EN 61810-3.
• 1 NO + 1 NC contact configuration provides complementary switching and monitoring functions.
• 12 V DC coil for integration into compatible low-voltage control systems.
• 6 A contact rating supports a range of industrial control loads.
• 250 V AC rated switching voltage for suitable electrical applications.
• Spring-clamp terminals provide secure, screwless electrical connections.
• LED coil status indicator simplifies commissioning, inspection and troubleshooting.
• Gold-plated silver-nickel contacts support reliable switching performance.
• Compact 22.5 mm width helps conserve space inside industrial control cabinets.
• 35 mm DIN rail mounting enables straightforward panel installation.
• −40 to +70 °C operating temperature range supports demanding industrial environments.
• 10 million mechanical operations provide a long mechanical service life.
• Single-channel architecture for integration into suitably designed safety-related systems.

Key Features

• Finder Series 7S relay module with forcibly guided contacts.
• Type 7S.12 with screwless spring-clamp terminals.
• 12 V DC nominal coil voltage.
• 1 normally open (NO) + 1 normally closed (NC) contact arrangement.
• 2-pole switching configuration.
• 6 A rated contact current.
• 250 V AC rated switching voltage.
• Class A forcibly guided contacts according to EN 61810-3.
• Silver-nickel contacts with gold plating.
• LED indication of coil energisation.
• Spring-loaded, screwless terminals for electrical connections.
• Single-channel relay architecture.
• 7 ms operating time.
• 11 ms release time.
• Approximately 0.7 W coil consumption.
• 35 mm DIN rail mounting.
• 22.5 mm module width.
• IP20 protection rating.
• −40 to +70 °C operating temperature range.
• 10 million mechanical operations.
• Suitable for safety-related control systems when correctly integrated and validated.

Forcibly Guided Contacts for Safety-Related Control Circuits

The defining feature of the Finder 7S.12.9.012.5110 is its use of Class A forcibly guided contacts. Unlike ordinary relay contacts, the normally open and normally closed contacts are mechanically linked so that a specified minimum separation is maintained between opposing contacts if one contact becomes welded.

This mechanical arrangement helps a correctly designed monitoring circuit detect certain relay contact faults. For example, if a normally open contact becomes welded closed, the associated normally closed contact cannot return to its normal closed state. A suitable safety controller or monitoring circuit can use this behaviour to identify a fault and prevent an unsafe restart.

The relay provides one normally open contact for a controlled switching function and one normally closed contact that can be incorporated into a feedback or monitoring circuit. The precise allocation of these contacts depends on the application and the safety circuit design.

The Finder 7S Series uses forcibly guided relay technology in accordance with EN 61810-3, supporting its integration into machinery safety systems designed according to relevant functional safety standards.

Important: The Finder 7S.12.9.012.5110 is a relay module with forcibly guided contacts, not a complete safety controller. The relay alone does not establish a safety category, Performance Level or Safety Integrity Level for an installation. The complete safety function must be designed, assessed and validated using the applicable standards.

12 V DC Operation and Reliable Industrial Switching

The Finder 7S.12.9.012.5110 operates from a 12 V DC nominal coil supply, with a specified operating voltage range of 9.6 to 14.4 V DC. Its coil draws approximately 55 mA at nominal voltage, corresponding to a rated power consumption of approximately 0.7 W.

The module offers a 6 A rated contact current and a 250 V AC rated switching voltage, allowing it to interface with a variety of suitable industrial control loads. Contact loading must always remain within the applicable ratings for the load type and switching conditions.

The silver-nickel contacts with gold plating are designed to provide reliable electrical contact performance. The gold-plated contact surfaces are particularly useful in applications where dependable contact operation is important, including suitably specified low-energy monitoring circuits.

With an operating time of approximately 7 ms and a release time of approximately 11 ms, the module provides defined switching characteristics for control circuit design. These relay timings should not be treated as the total stopping time of a machine or complete safety system.

Compact DIN Rail Installation with Spring-Clamp Terminals

The Finder 7S.12.9.012.5110 safety relay module is housed in a compact enclosure measuring approximately 22.5 mm wide, 86.2 mm high and 100.3 mm deep. Its slim construction makes it suitable for installation in industrial automation cabinets where DIN rail space is limited.

The relay uses screwless spring-clamp terminals, allowing conductors to be connected without conventional screw terminals. When installed using the manufacturer's recommended conductor sizes and wiring procedure, spring-clamp connections provide a secure and maintenance-friendly termination method.

An integrated LED coil status indicator provides immediate visual confirmation of coil energisation, helping technicians during commissioning and fault diagnosis. The LED indicates the coil's electrical status; it does not independently verify the state of every relay contact or the safety of the connected machinery.

The module has an IP20 protection rating and should be installed inside a suitable electrical enclosure. Its wide −40 to +70 °C operating temperature range supports applications in demanding industrial environments, subject to the manufacturer's installation requirements.

Functional Safety and Machine Control Considerations

Finder Series 7S relay modules are designed for integration into safety-related electrical control systems. Their forcibly guided contacts make them suitable components for applications involving contact monitoring and fault detection.

The Series 7S is associated with applications up to SIL 2 according to IEC 61508, subject to the architecture, diagnostic coverage, reliability calculations and validation of the complete system. Machinery safety applications may also be assessed under EN ISO 13849-1.

The Finder 7S.12.9.012.5110 has a single-channel architecture. Its use in a safety function must therefore be assessed against the required Performance Level, Safety Integrity Level and fault tolerance of the complete installation.

For emergency-stop circuits, guard monitoring, machine interlocks and other safety-related applications, the relay should be integrated with appropriate safety monitoring and control equipment. A qualified functional safety professional should verify the circuit architecture, contact ratings, diagnostic measures and required safety performance before commissioning.

Typical Applications

• Industrial machinery safety-related control circuits.
• Safety relay switching and contact feedback applications.
• Machine guarding and interlock monitoring systems.
• Emergency-stop control circuits within appropriately designed safety systems.
• Industrial automation and PLC control panels.
• Safety-related relay interface circuits.
• Manufacturing equipment and production machinery.
• Industrial process control installations.
• Machine control circuits requiring forcibly guided contacts.
• Safety monitoring and feedback circuits.
• Railway-related control equipment where the complete application requirements are satisfied.
• DIN rail-mounted electrical control cabinets.
• Low-voltage 12 V DC industrial control systems.
• Industrial systems requiring reliable relay switching and LED coil status indication.