40.61.6.024.4001 Finder Miniature PCB relay 1pole 16ADC

Finder 40.61.6.024.4001 – 24 V AC/DC 16 A Bistable PCB Relay with AgSnO₂ Contacts

The Finder 40.61.6.024.4001 is a high-performance 16 A miniature bistable relay designed for reliable electrical switching in industrial automation, electronic control systems and printed circuit board assemblies. Part of the Finder 40 Series, this relay features one changeover contact (1CO / SPDT), a 24 V AC/DC single-coil latching mechanism and silver-tin oxide contacts for demanding switching applications.

Unlike conventional monostable relays, the Finder 40.61.6.024.4001 uses a bistable electromagnetic operating mechanism that maintains its contact position after the control signal is removed. This allows the relay to retain its switching state without continuous coil energisation, reducing control power consumption and heat generation in suitable applications.

Featuring silver-tin oxide (AgSnO₂) contact material, a 16 A rated contact current and RT III wash-tight construction, this relay is suitable for compact electronic assemblies requiring reliable switching, low standby consumption and robust PCB integration. It can be installed directly onto a printed circuit board or used with a compatible Finder 95 Series relay socket.

Key Advantages

• 16 A rated contact current for compatible electrical loads.
• 24 V AC/DC bistable coil for controlled set and reset operation.
• Single-coil latching mechanism retains the contact position without continuous coil power.
• One changeover contact (1CO / SPDT) provides flexible circuit switching.
• Silver-tin oxide (AgSnO₂) contacts provide robust switching performance.
• High inrush-current capability on the normally open contact under specified conditions.
• Reduced holding power consumption compared with continuously energised monostable relays.
• Compact PCB-compatible housing saves valuable installation space.
• RT III wash-tight construction supports compatible PCB cleaning processes.
• 5 mm contact pin pitch supports standard PCB layout arrangements.
• Reinforced coil-to-contact insulation for electrical separation.
• 6 kV impulse withstand capability between coil and contacts.
• PCB or compatible socket mounting provides installation flexibility.
• Suitable for energy-conscious control systems where contact state must be retained.
• Finder 40 Series construction for professional electronic and industrial applications.

Key Features

• Finder 40 Series miniature power relay.
• Type 40.61 bistable configuration.
• Single-coil magnetic latching operation.
• 24 V AC/DC nominal coil voltage.
• One changeover contact (1CO).
• SPDT / Form C contact arrangement.
• 16 A rated contact current.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage.
• 4,000 VA rated AC-1 switching load.
• 750 VA AC-15 switching load at 230 V AC.
• Silver-tin oxide (AgSnO₂) contact material.
• Single-coil set/reset control using the appropriate operating circuit.
• Minimum 20 ms set/reset impulse duration.
• Approximately 1 W DC or 1 VA AC nominal coil consumption during energisation.
• Reinforced insulation between coil and contacts.
• 6 kV impulse withstand voltage between coil and contacts.
• 8 mm coil-to-contact clearance and creepage design.
• RT III wash-tight environmental protection.
• Through-hole PCB mounting.
• Compatible Finder 95 Series socket installation.
• 5 mm contact terminal pitch.
• Compact miniature relay housing.

How the Finder 40.61.6.024.4001 Bistable Relay Works

The Finder 40.61.6.024.4001 operates differently from a conventional non-latching electromagnetic relay. Instead of requiring continuous coil power to maintain its switched position, it uses a single-coil bistable mechanism that retains its last commanded contact state after the operating signal has been removed.

The relay provides one changeover contact, consisting of a common terminal, a normally closed terminal and a normally open terminal. Its two stable contact positions allow the connected circuit to remain in the selected state without continuous energisation.

To change the relay state, the control circuit applies the appropriate SET or RESET command. The manufacturer's wiring arrangement determines how the single coil is energised for each operation. For the AC operating arrangement, the set and reset functions use the specified diode and resistor circuitry; the DC arrangement uses the corresponding manufacturer-defined control circuit.

The minimum recommended SET or RESET impulse duration is 20 ms. The control circuit must prevent simultaneous set and reset commands and follow the Finder wiring diagram for the selected AC or DC operating method.

Once the relay has been set, the contacts remain in their selected position even when the operating impulse ends. A subsequent reset command returns the relay to its other stable position. This behaviour makes the Finder 40.61.6.024.4001 suitable for systems requiring retained switching states, reduced standby power consumption and controlled changeover operation.

Because the relay is bistable, its contacts do not automatically return to a default position when the control supply is lost. This characteristic must be considered when designing equipment where a defined power-loss response is required.

16 A Switching Performance and AgSnO₂ Contacts

The Finder 40.61.6.024.4001 features a 16 A rated changeover contact suitable for electrical loads within the manufacturer's specified utilisation categories. The 40.61 relay family provides a rated AC-1 switching capacity of 4,000 VA and an AC-15 switching capacity of 750 VA at 230 V AC.

The silver-tin oxide (AgSnO₂) contact material is particularly valuable in switching applications involving demanding contact conditions. This material provides resistance to contact welding and is often selected for equipment with elevated switching inrush currents.

For compatible AgSnO₂ versions of the 40.61 relay, Finder specifies a high short-duration peak-current capability on the normally open contact. This does not represent a continuous operating current and must not be used as a substitute for the relevant steady-state or application-specific switching rating.

When switching LED drivers, electronic power supplies, transformers or other loads with significant inrush current, the connected equipment's characteristics must be checked against Finder's applicable switching curves and load ratings.

The relay's reinforced coil-to-contact insulation, with an impulse withstand capability of 6 kV, supports electrical separation between compatible control and load circuits when the relay is incorporated into a correctly designed assembly.

PCB Installation and Finder 95 Series Socket Compatibility

The Finder 40.61.6.024.4001 is designed for direct through-hole PCB installation or use with a compatible Finder 95 Series relay socket. Its 5 mm contact terminal pitch supports integration into electronic control boards and industrial equipment.

For PCB mounting, designers should follow Finder's recommended pin layout and provide suitable conductor track widths, clearances, creepage distances and thermal management for the intended switching current.

Where serviceability is important, a compatible Finder 95 Series socket can allow the relay to be replaced without desoldering. Certain socket arrangements also support installation on a standard 35 mm DIN rail, making the relay suitable for modular electrical control panels.

The RT III wash-tight construction is intended for compatible PCB washing processes during electronic assembly manufacture. Soldering, cleaning and drying procedures should follow Finder's technical guidance to preserve the relay's performance.

Unlike a conventional installation contactor, this miniature relay is a component intended for incorporation into a suitable electronic assembly or relay socket system. It should not be connected directly to unsupported field wiring or installed without the necessary electrical enclosure and protection arrangements.

Typical Applications

• Industrial automation control systems.
• PCB-mounted electrical switching assemblies.
• Energy-efficient electronic control circuits.
• Bistable and latching switching applications.
• Electrical load control requiring retained contact states.
• Building automation control equipment.
• Industrial machine control electronics.
• Remote electrical switching systems.
• Electronic power management equipment.
• Control panels with compatible Finder 95 Series sockets.
• Instrumentation and monitoring equipment.
• Electronic equipment requiring single-coil set/reset operation.
• Control systems where continuous coil energisation is undesirable.
• Professional PCB manufacturing and electronic assemblies.
• Electrical control system maintenance and upgrades.