Finder 50.16.9.048.5420 – 50 Series Relays with forcibly guided contacts

Why Choose the Finder 50.16.9.048.5420 48 V DC 8 A Force-Guided Safety Relay?

The Finder 50.16.9.048.5420 is a six-pole, PCB-mounted electromechanical safety relay with forcibly guided contacts from the Finder Series 50 range. Designed for safety-related industrial control and monitoring applications, it combines a 48 V DC operating coil, six 8 A contacts and a mechanically linked contact arrangement that supports reliable switching and fault monitoring.

Featuring four normally open (4 NO) and two normally closed (2 NC) contacts, this relay provides multiple switching and feedback paths within a single compact component. Its Type A forcibly guided contact construction, in accordance with EN 61810-3 (formerly EN 50205), makes it particularly suitable for safety-related control circuits requiring monitoring of contact states and detection of certain contact faults.

The Finder 50.16.9.048.5420 incorporates silver tin oxide contacts with gold plating (AgSnO₂ + Au), a 0.8 W DC coil and RT III wash-tight environmental protection. Its through-hole PCB mounting design, high insulation between adjacent contacts and reinforced coil-to-contact separation make it a practical choice for machinery safety equipment, industrial automation and OEM electronic control 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 ensures mechanically linked operation of all six contacts.
• 48 V DC operating coil is suitable for compatible industrial DC control systems.
• 8 A rated contact current supports appropriately rated industrial switching applications.
• Gold-plated silver tin oxide contacts provide suitable contact characteristics for industrial and low-level switching duties.
• 6 kV coil-to-contact impulse withstand voltage supports electrical insulation between control and switched circuits.
• 8 mm coil-to-contact separation contributes to the relay's insulation performance.
• RT III wash-tight construction supports suitable PCB assembly and cleaning processes.
• Low 0.8 W coil consumption helps limit control circuit power requirements.
• 10 million mechanical operations provide long-term mechanical durability under specified operating conditions.
• PCB mounting enables direct integration into safety-related electronic equipment.

Key Features

• Finder Series 50 forcibly guided contact relay.
• Finder Type 50.16 six-pole safety relay.
• 48 V DC nominal coil voltage.
• 36–57.6 V DC coil operating range.
• 2.88 kΩ nominal coil resistance.
• 16.6 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 contact arrangement.
• 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 electromechanical operation.

Reliable Force-Guided Contact Monitoring for Industrial Safety Systems

The Finder 50.16.9.048.5420 operates through a 48 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 coil is de-energised, the contacts return to their normal positions.

The relay's EN 61810-3 Type A forcibly guided construction ensures that the normally open and normally closed contacts maintain a defined mechanical relationship. Under specified fault conditions, such as a welded contact, the contact guidance prevents an opposing contact from returning to an inconsistent closed position. This behaviour enables an appropriately designed safety controller to detect certain contact faults through feedback monitoring.

The 4 NO + 2 NC arrangement is particularly useful in systems requiring multiple switched outputs and independent feedback connections. The normally open contacts can be incorporated into controlled switching paths, while the normally closed contacts can be used within monitoring circuits to verify relay state, subject to the complete safety system design.

The relay also provides 6 kV impulse insulation between the coil and contacts, a wash-tight RT III housing and gold-plated silver tin oxide contacts. These characteristics support integration into industrial PCB assemblies exposed to demanding operating conditions.

Safety design consideration: The Finder 50.16.9.048.5420 is a forcibly guided relay component, not a complete safety controller. Achieving a specified Performance Level (PL) under EN ISO 13849-1 or Safety Integrity Level (SIL) 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 safety-related electronic assemblies.
• Machine guarding and safety interlocking equipment.
• Lift and escalator control systems.
• Industrial hoists and crane control equipment.
• Automated warehouse and material-handling machinery.
• Robotic machinery and industrial automation.
• Safety-related PLC interface circuits.
• Contact-state monitoring and fault-detection systems.
• OEM electronic safety equipment manufacturing.
• Industrial control PCB assemblies requiring multiple guided contacts.