Finder 7S.36.9.024.5420 – 7S Series Relay modules with forcibly guided contacts

Finder 7S.36.9.024.5420 Safety Relay – 24 V DC, 6 A, 4 NO + 2 NC Forcibly Guided Contacts

The Finder 7S.36.9.024.5420 is a high-performance 24 V DC modular safety relay with forcibly guided contacts, designed for industrial automation, machinery control and safety-related electrical systems. Part of the Finder 7S Series, this six-pole electromechanical relay combines a 4 normally open (NO) + 2 normally closed (NC) contact arrangement with a 6 A contact rating, providing multiple switching paths and diagnostic feedback contacts in one compact DIN rail-mounted device.

Featuring Class A forcibly guided contact technology, the Finder 7S.36.9.024.5420 supports the detection of specified contact faults, including welded contacts, when integrated into an appropriately designed monitoring circuit. Its mechanically linked contacts make it particularly useful in applications where switching reliability and feedback about relay contact positions are important.

The relay features a 24 V DC coil, silver tin oxide contacts with gold plating, an integrated LED coil status indicator and secure screw terminal connections. With a housing width of just 22.5 mm, it is designed for efficient installation in industrial control cabinets where DIN rail space is limited.

Key Advantages

• Six forcibly guided contacts for monitored industrial switching applications.
• 4 NO + 2 NC contact arrangement provides four normally open switching paths and two normally closed feedback paths.
• 24 V DC nominal coil for widely used industrial control voltages.
• 6 A contact rating for compatible automation and control loads.
• Class A mechanically linked contacts help external monitoring circuits identify specified relay faults.
• Gold-plated silver tin oxide contacts provide a contact construction suitable for the relay's specified switching duties.
• Integrated LED indicator allows convenient visual confirmation of coil energisation.
• Screw terminals provide secure and familiar electrical connections.
• 22.5 mm-wide modular housing conserves valuable control panel space.
• 35 mm DIN rail mounting simplifies installation and replacement.
• −40 to +70 °C operating temperature range supports demanding industrial environments.
• IP20 protection rating for installation inside suitable electrical enclosures.
• Suitable for incorporation into appropriately engineered machinery safety and monitored control systems.

Key Features

• Finder 7S Series modular electromechanical relay.
• Six-pole contact configuration: 4 NO + 2 NC.
• Forcibly guided contact mechanism for external contact-state monitoring.
• 24 V DC nominal coil voltage.
• 16.8 V DC must-operate voltage.
• 2.4 V DC must-release voltage.
• Approximately 42.2 mA coil current.
• 1 W nominal coil power.
• 6 A rated contact current.
• 250 V AC nominal switching voltage.
• 1,500 VA rated AC-1 switching capacity.
• Silver tin oxide and gold contact construction.
• 12 ms typical operate time.
• 10 ms typical release time.
• Integrated LED coil status indicator.
• Monostable, non-latching operation.
• Screw terminal connections.
• 35 mm DIN rail mounting.
• 22.5 mm-wide housing.
• IP20 protection rating.

How Forcibly Guided Contacts Support Safety Circuit Monitoring

The Finder 7S.36.9.024.5420 uses forcibly guided contacts to support reliable monitoring of electromechanical switching operations. Unlike an ordinary relay, its normally open and normally closed contacts are mechanically linked to maintain a defined relationship between their operating positions.

If a normally open contact becomes welded closed, the mechanical linkage prevents the normally closed contacts from returning to their closed positions. A suitably designed external monitoring circuit can detect this abnormal condition and prevent the next operating cycle until the fault has been investigated.

The relay's 4 NO + 2 NC contact configuration offers useful flexibility. The four normally open contacts can be allocated to suitable switching circuits, while the two normally closed contacts can provide diagnostic feedback. This arrangement is valuable where multiple outputs must be controlled and the relay's mechanical switching state must also be monitored.

Forcibly guided contacts are particularly useful in machinery safety-related applications, but they do not make a relay a complete safety controller. Achieving a specified Performance Level (PL) or Safety Integrity Level (SIL) requires assessment of the entire safety function, including circuit architecture, diagnostic coverage, reliability and validation.

24 V DC Operation and Compact DIN Rail Installation

The Finder 7S.36.9.024.5420 is designed for control systems using a 24 V DC nominal supply, a common voltage in industrial automation. Its specified must-operate voltage is 16.8 V DC, and the nominal coil power is approximately 1 W.

The relay mounts on a standard 35 mm DIN rail and uses screw terminal connections. Its compact 22.5 mm-wide housing allows it to be installed alongside other control and automation components without occupying excessive cabinet space.

An integrated LED indicator provides a visual indication when the relay coil is energised. This can simplify commissioning, routine checks and fault finding. However, the LED indicates coil energisation rather than independently confirming the position or integrity of every relay contact.

With an IP20 protection rating, the relay should be installed inside an appropriate electrical enclosure. Its specified ambient operating temperature range of −40 to +70 °C supports a wide range of industrial environments when installed according to the manufacturer's requirements.

Typical Applications

• Industrial machinery safety-related control circuits.
• Safety PLC switching and feedback interfaces.
• Emergency-stop control architectures with suitable external monitoring.
• Machine guarding and interlocking systems.
• Manufacturing and production line automation.
• Conveyor and material-handling systems.
• Hoists, cranes and lifting equipment controls.
• Packaging and processing machinery.
• Escalator and lift control systems.
• Automated warehouse and carousel storage systems.
• Industrial process control equipment.
• Automatic car wash control systems.
• Monitored relay output stages.
• Applications requiring four normally open switching contacts and two normally closed feedback contacts.