Finder 7S.16.9.012.5420 – 7S Series Relay modules with forcibly guided contacts

Finder 7S.16.9.012.5420 Safety Relay – 12 V DC, 6 A, 4 NO + 2 NC Forcibly Guided Contacts

The Finder 7S.16.9.012.5420 is a professional 12 V DC safety relay module featuring six forcibly guided contacts, designed for industrial machinery, automation equipment and safety-related electrical control systems. Part of the Finder 7S Series, this DIN rail-mounted electromechanical relay combines a 4 normally open (NO) + 2 normally closed (NC) contact arrangement with a 6 A rated contact current, providing multiple switching paths and feedback contacts in a compact industrial control module.

The relay incorporates Class A forcibly guided contacts in accordance with EN 61810-3. Its mechanically linked contact arrangement supports the detection of specified contact failures, such as welded contacts, when used with an appropriately designed external monitoring circuit. This makes the Finder 7S.16.9.012.5420 particularly suitable for applications requiring dependable switching and diagnostic feedback.

With its 22.5 mm-wide housing, screwless spring-clamp terminals, integrated LED coil status indication and standard 35 mm DIN rail mounting, the Finder 7S.16.9.012.5420 offers a practical solution for compact industrial control panels. Its six-contact configuration is especially useful where several normally open switching outputs are required alongside two normally closed contacts for feedback or monitoring.

Key Advantages

• Six forcibly guided contacts support monitored switching in safety-related control circuits.
• 4 NO + 2 NC configuration provides four normally open switching contacts and two normally closed contacts.
• 12 V DC rated coil for compatible low-voltage industrial control supplies.
• 6 A rated contact current for suitable industrial switching applications.
• Class A mechanically linked contacts support the detection of specified contact faults.
• Integrated LED coil indication simplifies commissioning and troubleshooting.
• Silver tin oxide contacts with gold plating provide a contact construction suited to the specified relay applications.
• Screwless spring-clamp terminals enable efficient wiring within control cabinets.
• 22.5 mm module width helps conserve DIN rail space.
• 35 mm DIN rail mounting provides straightforward installation.
• −40 to +70 °C operating temperature range supports use in demanding industrial environments.
• Suitable for integration into properly designed SIL 2 or PL d safety-related systems, subject to system-level assessment and validation.

Key Features

• Finder 7S Series modular safety relay.
• Six-pole electromechanical relay with forcibly guided contacts.
• 4 normally open and 2 normally closed contacts.
• Class A contact guidance according to EN 61810-3.
• 12 V DC nominal coil voltage.
• 9.6 V DC minimum operate voltage.
• 1.2 V DC release voltage specification.
• 6 A rated contact current.
• 250 V AC nominal switching voltage.
• 1,500 VA AC-1 switching capacity.
• Silver tin oxide (AgSnO) contacts with gold plating.
• 12 ms typical operate time.
• 10 ms typical release time.
• LED indication of coil energisation.
• Non-latching relay operation.
• Screwless spring-clamp terminal connections.
• 35 mm DIN rail mounting in accordance with EN 60715.
• IP20 protection rating.
• Designed for integration into industrial automation and monitored safety control architectures.

How Forcibly Guided Contact Technology Supports Safety Monitoring

The Finder 7S.16.9.012.5420 is designed for control systems where electrical switching must be accompanied by reliable feedback about contact operation. Conventional relays do not necessarily maintain a defined mechanical relationship between normally open and normally closed contacts following a failure. The Finder 7S Series addresses this requirement through Class A forcibly guided contacts.

The relay's four normally open and two normally closed contacts are mechanically linked. If a normally open contact becomes welded closed, the mechanical arrangement prevents the normally closed contacts from returning to their normal closed positions. An appropriately designed monitoring circuit can detect this abnormal condition and inhibit further operation until the fault is addressed.

This arrangement makes the relay particularly useful for machine control circuits, monitored output stages and safety-related switching applications. The normally open contacts may be used for switching suitable loads, while the normally closed contacts can provide feedback to a safety controller or monitoring system. The precise contact allocation must follow the safety circuit design and the manufacturer's application requirements.

The Finder 7S.16.9.012.5420 can be incorporated into systems designed to achieve SIL 2 or Performance Level d (PL d). However, the relay itself does not independently establish these ratings. The overall safety performance depends on the complete architecture, including diagnostic coverage, redundancy where required, component reliability and validation.

Compact DIN Rail Installation and Reliable Industrial Operation

The Finder 7S.16.9.012.5420 features a 22.5 mm-wide modular housing designed for installation on a standard 35 mm DIN rail. This makes it suitable for industrial control cabinets where available mounting space is limited and several relay modules may need to be installed alongside other automation components.

Its screwless spring-clamp terminals support efficient installation and secure electrical connections when suitable conductors are used. The integrated LED provides a convenient indication that the coil is energised, helping engineers identify the relay's operating condition during commissioning and fault finding. The LED does not, by itself, verify that every contact has switched correctly.

The relay is designed to operate across an ambient temperature range of −40 to +70 °C. Its IP20-rated enclosure is intended for installation within a suitable protective electrical cabinet rather than direct exposure to moisture, dust-heavy environments or outdoor weather conditions.

Typical Applications

• Industrial machinery safety-related control circuits.
• Safety PLC switching and feedback interfaces.
• Emergency-stop systems with appropriate external monitoring.
• Machine guarding and safety interlocking systems.
• Industrial robot control systems.
• Conveyor and automated material-handling equipment.
• Production line and manufacturing machinery.
• Packaging and processing equipment.
• Automated warehouse and storage systems.
• Lift, escalator and lifting equipment control systems.
• Industrial control panels requiring multiple switching outputs.
• Safety-related circuits requiring two normally closed feedback contacts.
• Chemical processing and other industrial automation installations.