Finder 40.61.8.125.4000 – 40 Series Miniature PCB Relays

Why Choose the Finder 40.61.8.125.4000 Miniature Power Relay?

The Finder 40.61.8.125.4000 is a compact 16 A miniature electromechanical power relay designed for industrial automation, electrical control systems and general-purpose load switching. Part of the Finder Series 40, this relay combines a 125 V AC operating coil with a single changeover contact, providing an effective interface between an AC control circuit and a separate electrical load.

Featuring one changeover contact (SPDT / 1 CO), a 16 A contact current rating and silver tin oxide (AgSnO2) contacts, the Finder 40.61.8.125.4000 is suitable for compatible industrial switching applications. The AgSnO2 contact material is particularly relevant when selecting relays for loads with demanding switching characteristics, although actual load suitability must always be assessed against the applicable switching ratings.

With a nominal body size of 12.4 × 29 × 25 mm, this miniature relay is suitable for direct PCB mounting or installation in an appropriate compatible socket. Its monostable, non-latching operation ensures that the contacts return to their normal position when the AC coil supply is removed, making it a practical choice for machine builders, control panel manufacturers and maintenance engineers.

Key Advantages

• 125 V AC operating coil for compatible AC control circuits.
• 16 A rated contact current for suitable electrical loads.
• Single changeover contact (SPDT / 1 CO) provides normally open and normally closed switching options.
• Silver tin oxide (AgSnO2) contact material for robust electromechanical switching.
• 1.2 VA nominal AC coil consumption supports efficient control circuit design.
• 250 V AC rated contact voltage for compatible switching applications.
• Compact miniature housing helps conserve space in electronic equipment.
• Direct PCB mounting or compatible socket installation offers flexibility.
• Monostable operation returns the contacts to their normal position when coil power is removed.
• Electromechanical switching provides a physically opening contact arrangement.
• Suitable for industrial automation, machinery and electrical control equipment.
• Part of the established Finder Series 40 miniature relay range.

Key Features

• Finder Series 40 miniature power relay.
• Type 40.61 single-pole changeover design.
• 125 V AC nominal coil voltage.
• AC electromagnetic coil for alternating-current control supplies.
• 1.2 VA nominal coil consumption.
• 16 A rated contact current.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage under applicable Series 40.61 conditions.
• 4000 VA rated AC1 switching capacity.
• SPDT / 1 Form C / 1 CO contact configuration.
• Silver tin oxide (AgSnO2) contact material.
• Monostable, non-latching relay operation.
• PCB through-hole mounting.
• Compatible with suitable relay sockets.
• 12.4 mm nominal body width.
• 12.4 × 29 × 25 mm nominal body dimensions.
• Suitable for compatible AC-powered industrial control circuits.
• Designed for electrical load switching and control interfacing.

Reliable 125 V AC Control with 16 A Changeover Switching

The Finder 40.61.8.125.4000 operates using an electromagnetic coil designed for a 125 V AC nominal control supply. When the appropriate AC voltage is applied to the coil, the relay energises and transfers its common contact from the normally closed terminal to the normally open terminal. Removing the coil supply allows the relay to return to its normal, de-energised position.

Its 16 A changeover contact enables a control circuit to switch a separate electrical load, while the AgSnO2 contact material provides switching characteristics suitable for a range of compatible industrial applications. The relay's contact rating must be interpreted alongside the actual load type, supply voltage, switching frequency and operating conditions.

The compact Series 40.61 design supports direct mounting on a suitable printed circuit board. Alternatively, the relay can be installed in an appropriately rated compatible socket, potentially simplifying wiring and future replacement. When selecting a socket, the installer should verify its current rating, terminal arrangement, mounting method and compatibility with the exact relay variant.

The 125 V AC coil is an important distinction from the 12 V DC, 24 V DC and 48 V DC versions of the same relay family. These coil variants are not interchangeable without checking the control supply. For motors, transformers, capacitive loads and LED drivers, starting current and inrush current should also be considered before selecting the relay.

Typical Applications

• Industrial automation and machinery control.
• Electrical control circuits using a compatible 125 V AC supply.
• Control panel switching assemblies.
• Industrial equipment and machine interfaces.
• PCB-based electrical control equipment.
• Industrial signalling and indication circuits.
• Building services control systems.
• Auxiliary control and interlocking circuits.
• Packaging and production machinery.
• OEM electrical and electronic assemblies.
• General-purpose changeover switching.
• Maintenance and replacement of compatible Finder Series 40.61 relays.