Finder 50.16.9.024.5510 – 50 Series Relays with forcibly guided contacts

Why Choose the Finder 50.16.9.024.5510 Safety Relay?

The Finder 50.16.9.024.5510 is a high-performance 8 A PCB-mounted safety relay featuring six forcibly guided contacts for industrial machinery safety, automation and safety-related control applications. Part of the Finder 50 Series, this relay combines a 24 V DC operating coil with a 5 normally open (5 NO) + 1 normally closed (1 NC) contact arrangement, providing multiple switching paths and a mechanically linked feedback contact.

Designed with Type A forcibly guided contact technology in accordance with EN 61810-3, formerly EN 50205, the Finder 50.16.9.024.5510 supports fault monitoring within appropriately designed safety circuits. Its mechanically linked contacts are designed to prevent normally open and normally closed contacts from simultaneously occupying incompatible closed states under the fault conditions addressed by the standard.

Featuring silver tin oxide contacts with gold plating (AgSnO₂ + Au), an 800 mW DC coil and RT III wash-tight construction, this compact relay is suitable for integration into industrial electronic assemblies. Its 55 × 16.5 × 16.5 mm housing, PCB solder terminals and high electrical insulation make it a practical component for safety relay modules, machine control boards and OEM safety equipment.

Key Advantages

• Six forcibly guided contacts for safety-related switching and monitoring.
• 5 NO + 1 NC configuration provides five normally open switching paths and one normally closed feedback path.
• EN 61810-3 Type A design supports contact-state monitoring in properly engineered safety circuits.
• 24 V DC nominal coil voltage for compatible industrial control electronics.
• 8 A rated contact current for appropriately rated electrical loads.
• 15 A maximum peak contact current under specified conditions.
• Gold-plated silver tin oxide contacts support reliable electrical switching.
• 0.8 W nominal coil consumption supports efficient operation.
• 6 kV coil-to-contact impulse withstand voltage provides high electrical insulation.
• 8 mm coil-to-contact insulation distance supports electrical separation.
• RT III wash-tight construction is suitable for compatible PCB manufacturing processes.
• Compact PCB mounting supports integration into safety controllers and electronic equipment.
• −40 to +70 °C operating temperature range supports demanding industrial environments.

Key Features

• Finder 50 Series electromechanical safety relay.
• 50.16 six-pole relay design.
• Five normally open contacts (5 NO).
• One normally closed contact (1 NC).
• Six mechanically linked, forcibly guided contacts.
• Type A forcibly guided contact construction.
• 24 V DC nominal coil voltage.
• 720 Ω nominal coil resistance.
• 33.3 mA nominal coil current.
• 800 mW nominal coil power.
• 8 A rated contact current.
• 15 A maximum peak contact current.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage.
• 2,000 VA rated AC1 resistive switching capacity.
• AgSnO₂ + Au contact material.
• RT III wash-tight enclosure.
• PCB solder terminal mounting.
• 5 mm terminal pitch.
• Cadmium-free contact materials.

Forcibly Guided Contacts for Safety Monitoring and Fault Detection

The Finder 50.16.9.024.5510 incorporates Type A forcibly guided contacts, a technology used in industrial safety-related control systems. The relay's normally open and normally closed contacts are mechanically linked so that certain contact faults can be detected by an external monitoring circuit.

For example, if a normally open contact becomes welded closed, the mechanically linked normally closed contact is prevented from returning to its normal closed position in the manner specified by the forcibly guided contact standard. A properly designed safety monitoring circuit can detect this condition through the feedback contact and prevent an unsafe restart.

The 5 NO + 1 NC arrangement makes this relay particularly suitable for applications requiring multiple normally open switching outputs together with a normally closed monitoring contact. Unlike the Finder 50.16.9.024.5420, which has four normally open and two normally closed contacts, the 50.16.9.024.5510 provides an additional normally open contact and one fewer normally closed contact.

Important: A forcibly guided relay is a safety-related component, not a complete safety controller. Achieving a specified Performance Level (PL) or Safety Integrity Level (SIL) requires suitable circuit architecture, diagnostics, component selection and system validation.

Compact PCB Integration and Industrial Reliability

Designed for direct PCB installation, the Finder 50.16.9.024.5510 combines six contact circuits within a compact 55 × 16.5 × 16.5 mm housing. Its 5 mm terminal pitch supports integration into industrial control boards and safety-related electronic assemblies.

The relay's RT III wash-tight construction helps protect its internal mechanism during compatible printed circuit board cleaning processes. Its AgSnO₂ + Au contacts, low-power DC coil and high insulation characteristics make it a practical choice for professionally engineered industrial control equipment.

Typical Applications

• Industrial machinery safety control circuits.
• Safety relay modules and safety monitoring equipment.
• Emergency stop monitoring and control systems.
• Machine guard and safety interlock circuits.
• Safety-related PLC output interfaces.
• Industrial automation safety electronics.
• Relay feedback and contact monitoring circuits.
• OEM machine safety control boards.
• Factory automation and production machinery.
• Industrial control systems requiring multiple normally open contacts.
• Electrical switching assemblies with forcibly guided contact requirements.
• PCB-mounted safety equipment requiring a 24 V DC relay.