Finder 50.16.9.110.5420 – 50 Series Relays with forcibly guided contacts

Why Choose the Finder 50.16.9.110.5420 110 V DC 8 A Force-Guided Safety Relay?

The Finder 50.16.9.110.5420 is a six-pole PCB-mounted electromechanical relay with forcibly guided contacts from the Finder Series 50 range. Designed for safety-related industrial control and monitoring applications, it features a 110 V DC operating coil, six 8 A contacts and a mechanically linked contact system suitable for appropriately engineered safety circuits.

Featuring four normally open (4 NO) and two normally closed (2 NC) contacts, the relay provides multiple switching and feedback paths within one compact component. Its EN 61810-3 Type A forcibly guided contact construction ensures a defined mechanical relationship between the normally open and normally closed contacts, helping safety-related monitoring circuits detect certain contact faults.

The Finder 50.16.9.110.5420 combines silver tin oxide contacts with gold plating (AgSnO₂ + Au), an energy-efficient 0.8 W DC coil and a compact through-hole PCB design. Its 6 kV coil-to-contact impulse insulation, wide operating temperature range and RT III wash-tight construction make it suitable for integration into industrial safety equipment, machinery control systems and OEM electronic assemblies.

Key Advantages

• Six forcibly guided contacts support safety-related switching and contact-state monitoring.
• 4 NO + 2 NC contact configuration provides four normally open switching paths and two normally closed feedback paths.
• EN 61810-3 Type A construction provides mechanically linked operation of all six contacts.
• 110 V DC nominal coil supports compatible industrial DC control systems.
• 8 A rated contact current enables switching of appropriately rated electrical loads.
• Gold-plated silver tin oxide contacts provide suitable characteristics for industrial and low-level switching applications.
• 6 kV coil-to-contact impulse withstand capability supports electrical insulation between the control and contact circuits.
• 8 mm coil-to-contact separation contributes to the relay's insulation performance.
• 0.8 W nominal coil consumption helps limit control circuit power requirements.
• RT III wash-tight construction supports suitable PCB manufacturing and cleaning processes.
• 10 million mechanical operations provide long-term mechanical durability under specified conditions.
• Compact PCB mounting supports integration into space-constrained industrial electronic equipment.

Key Features

• Finder Series 50 forcibly guided contact relay.
• Finder Type 50.16 six-pole configuration.
• 110 V DC nominal coil voltage.
• 82.5–132 V DC coil operating range.
• Approximately 15.1 kΩ nominal coil resistance.
• Approximately 7.3 mA nominal coil current.
• 0.8 W nominal coil consumption.
• Six contacts: 4 NO + 2 NC.
• 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 resistive switching capacity (AC1).
• 1,100 VA AC15 switching capacity at 230 V AC.
• AgSnO₂ + Au contact material.
• EN 61810-3 Type A forcibly guided contacts.
• 6 kV impulse insulation between coil and contacts.
• 10 ms operate time and 4 ms release time.
• Through-hole PCB solder terminals.
• RT III wash-tight environmental protection.
• Cadmium-free contact materials.
• Monostable, non-latching electromechanical operation.

Reliable Force-Guided Switching for Safety-Related Industrial Control

The Finder 50.16.9.110.5420 operates through a 110 V DC electromagnetic coil controlling six mechanically linked contacts. When the coil is energised, the four normally open contacts close while the two normally closed contacts open. When the control voltage is removed, the relay returns to its normal switching position.

The relay's EN 61810-3 Type A forcibly guided construction maintains a defined mechanical relationship between all normally open and normally closed contacts. Under specified fault conditions, such as a welded contact, this construction prevents an opposing contact from returning to an inconsistent closed position. An appropriately designed monitoring circuit can use this behaviour to identify certain relay contact faults.

The 4 NO + 2 NC arrangement is particularly useful in safety-related control architectures requiring several switching paths and dedicated feedback connections. The normally open contacts can perform controlled switching functions, while the normally closed contacts can provide monitoring information to the safety control system.

The relay also features gold-plated silver tin oxide contacts, 6 kV coil-to-contact impulse insulation and RT III wash-tight protection. These characteristics support reliable integration into industrial PCB assemblies and electronic control equipment.

Safety design consideration: A forcibly guided relay is a component rather than a complete safety controller. Achieving a specified Performance Level under EN ISO 13849-1 or Safety Integrity Level under IEC 62061 requires appropriate circuit architecture, diagnostics, component assessment and validation of the complete safety-related control system.

Typical Applications

• Industrial machinery safety control systems.
• Emergency-stop monitoring and feedback circuits.
• Safety relay modules and electronic safety assemblies.
• Machine guarding and safety interlocking systems.
• Lift and escalator control equipment.
• Industrial hoists and crane control systems.
• Automated warehouse and material-handling equipment.
• Robotic machinery and industrial automation.
• Safety-related PLC interface circuits.
• Contact-state monitoring and fault-detection systems.
• OEM safety-related electronic equipment manufacturing.
• PCB-mounted industrial control systems requiring multiple guided contacts.