Finder 50.16.9.024.5420 – 50 Series Relays with forcibly guided contacts

Why Choose the Finder 50.16.9.024.5420 Safety Relay?

The Finder 50.16.9.024.5420 is a high-performance 8 A PCB-mounted safety relay designed for industrial automation, machine safety and safety-related electrical control systems. Part of the Finder 50 Series, this electromechanical relay features six forcibly guided contacts, comprising four normally open (4 NO) and two normally closed (2 NC) contacts, together with a 24 V DC operating coil.

Designed in accordance with the principles of EN 50205 Type A forcibly guided contact technology, the Finder 50.16.9.024.5420 provides mechanically linked contact operation for use in safety monitoring and control circuits. Its contact arrangement enables designers to incorporate multiple switching paths and feedback contacts into safety-related systems, including applications requiring monitoring of relay contact states.

The relay incorporates gold-plated silver tin oxide (AgSnO₂ + Au) contacts, an 800 mW DC coil and a wash-tight RT III enclosure. With its compact PCB mounting arrangement, high electrical insulation and six-contact configuration, the Finder 50.16.9.024.5420 is particularly suitable for safety control equipment, industrial machinery and OEM electronic assemblies.

Key Advantages

• Six forcibly guided contacts designed for safety-related switching and monitoring applications.
• 4 NO + 2 NC contact configuration provides multiple switching and feedback paths.
• EN 50205 Type A forcibly guided contact design supports monitoring of mechanically linked relay contacts.
• 24 V DC nominal coil voltage for compatible industrial safety control circuits.
• 8 A rated contact current for suitable resistive loads.
• Gold-plated silver tin oxide (AgSnO₂ + Au) contacts support dependable electrical switching.
• 800 mW nominal coil power consumption provides efficient electromagnetic operation.
• 6 kV coil-to-contact impulse withstand voltage supports high electrical insulation.
• 8 mm coil-to-contact insulation distance provides electrical separation.
• Wash-tight RT III protection supports compatible PCB cleaning processes.
• PCB mounting enables direct integration into industrial electronic control assemblies.
• −40 to +70 °C operating temperature range supports demanding industrial environments.

Key Features

• Finder 50 Series safety relay with forcibly guided contacts.
• 50.16 relay type featuring six mechanically linked contacts.
• Four normally open (4 NO) contacts.
• Two normally closed (2 NC) contacts.
• EN 50205 Type A contact arrangement.
• 24 V DC nominal operating coil.
• 720 Ω nominal coil resistance.
• 33.3 mA nominal coil current.
• 0.8 W nominal coil power consumption.
• 8 A rated contact current.
• 15 A maximum contact current, subject to the specified operating conditions.
• 250 V AC rated contact voltage.
• 8 A at 30 V DC resistive contact rating.
• Gold-plated silver tin oxide contact material.
• High insulation between adjacent contacts.
• 6 kV impulse withstand voltage between coil and contacts.
• RT III wash-tight construction.
• 5 mm PCB terminal pitch.
• Cadmium-free contact construction.

Forcibly Guided Contact Technology for Safety-Related Control

The Finder 50.16.9.024.5420 uses forcibly guided contact technology, an important design feature in safety-related electromechanical relays. Unlike conventional relays with independently moving contact elements, forcibly guided relays mechanically link the normally open and normally closed contacts so that they cannot simultaneously assume contradictory closed states under the conditions defined by the relevant standard.

This contact arrangement is particularly useful in safety circuits that monitor relay operation through feedback contacts. If a normally open contact becomes welded closed, the mechanically linked normally closed contacts are prevented from closing in the normal way. An appropriately designed monitoring circuit can use this behaviour to detect certain relay faults and inhibit an unsafe restart.

The four normally open and two normally closed contacts provide flexibility for switching and monitoring functions within industrial safety equipment. However, the relay is a component rather than a complete safety controller. The safety performance of the finished system depends on the circuit architecture, diagnostics, load conditions and overall validation against applicable machinery safety requirements.

Compact PCB Mounting and Reliable Industrial Operation

With dimensions of 55 × 16.5 × 16.5 mm, the Finder 50.16.9.024.5420 is designed for direct integration into printed circuit board assemblies. Its 5 mm terminal pitch and compact housing support the development of industrial control electronics where multiple switching and monitoring contacts are required within a limited installation space.

The relay features RT III wash-tight construction, which helps protect the internal switching mechanism during compatible PCB cleaning processes. Its gold-plated silver tin oxide contacts, 800 mW DC coil and high coil-to-contact insulation make it suitable for integration into industrial safety modules, control boards and OEM machinery electronics.

Typical Applications

• Industrial machinery safety control circuits.
• Safety relay modules and monitoring equipment.
• Emergency stop control systems.
• Machine guard monitoring circuits.
• Safety-related PLC output interfaces.
• Industrial automation safety electronics.
• Safety interlocking and feedback monitoring circuits.
• Industrial control boards requiring forcibly guided contacts.
• OEM machinery safety assemblies.
• Factory automation and production equipment.
• Electrical control systems requiring multiple NO and NC contacts.
• Applications requiring PCB-mounted relays with mechanically linked contacts.