40.61.8.012.1000 Finder Miniature PCB relay 1pole 16A 12V

Why Choose the Finder 40.61.8.012.1000 16 A PCB Power Relay?

The Finder 40.61.8.012.1000 is a compact 16 A, 12 V AC electromechanical power relay from the Finder Series 40 range. Designed for printed circuit boards, industrial automation equipment and electrical control systems, this miniature relay combines a high-current changeover contact with a reliable AC-operated coil.

Featuring one changeover contact (1 CO / SPDT), the Finder 40.61.8.012.1000 allows a common electrical connection to switch between normally closed and normally open contact paths. With a 16 A rated contact current and 250 V AC rated contact voltage, it is suitable for switching compatible electrical loads in industrial control equipment, appliances and automation assemblies.

The relay operates from a 12 V AC, 50/60 Hz coil supply, making it suitable for control systems using low-voltage AC rather than DC. Its nominal coil resistance is 80 Ω, with a rated coil current of approximately 90 mA at 50 Hz.

The .1000 variant incorporates RT III wash-tight construction, providing additional protection during specified PCB cleaning processes. This makes the relay particularly useful for OEM electronic manufacturing and applications where compact power switching and manufacturing-process compatibility are important.

Key Advantages

• 16 A rated contact current for compatible electrical power-switching applications.
• 12 V AC coil for control circuits operating at 50/60 Hz.
• Single changeover contact (1 CO / SPDT) for normally open and normally closed switching.
• 250 V AC rated contact voltage for compatible mains-voltage loads.
• 400 V AC maximum switching voltage under specified conditions.
• 4000 VA AC-1 switching capacity for suitable resistive loads.
• RT III wash-tight construction for specified PCB washing processes.
• Compact miniature housing for space-efficient electronic assemblies.
• 5 mm contact pin pitch for compatible PCB footprints.
• 6 kV coil-to-contact impulse withstand voltage for substantial electrical isolation.
• 8 mm coil-to-contact creepage and clearance for electrical separation.
• Monostable operation for automatic return when the coil is de-energised.
• Compatible socket options within the Finder Series 95 range, subject to exact mechanical and electrical compatibility.

Key Features

• Finder Series 40 miniature power relay.
• Type 40.61 single-pole changeover design.
• Manufacturer part number: 40.61.8.012.1000.
• 16 A rated contact current.
• 12 V AC nominal coil voltage.
• 50/60 Hz AC coil operation.
• 1 CO / SPDT contact arrangement.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage.
• 4000 VA rated AC-1 switching capacity.
• 80 Ω nominal coil resistance.
• 90 mA nominal coil current at 50 Hz.
• 9.6 to 13.2 V AC specified coil operating range.
• RT III wash-tight enclosure classification.
• 6 kV coil-to-contact impulse withstand voltage.
• 8 mm coil-to-contact creepage and clearance.
• 5 mm contact pin pitch.
• Through-hole PCB mounting.
• Monostable, non-latching electromechanical operation.

Technical note: The contact and coil ratings above relate to the Finder Type 40.61 and the 8.012 AC coil configuration. The permissible switching load depends on the connected load, ambient temperature, duty cycle and mounting arrangement. Check the current manufacturer datasheet before specifying the relay for safety-critical or high-inrush applications.

12 V AC Coil for Low-Voltage Control Systems

The Finder 40.61.8.012.1000 is specifically designed for a 12 V AC control supply operating at 50/60 Hz.

This distinguishes it from otherwise similar Series 40 relays using 12 V DC coils. AC and DC coil variants are not directly interchangeable, even when their nominal voltage values are identical.

The 8.012 coil configuration has a specified operating range of 9.6 to 13.2 V AC. Its nominal resistance is 80 Ω, and its rated current at 50 Hz is approximately 90 mA.

When selecting a control transformer or other AC supply, the designer should account for the relay's operating voltage range, coil consumption, supply tolerances and any voltage drop in the control wiring.

The relay should not be connected directly to a 12 V DC supply unless the manufacturer specifically confirms compatibility. For DC control systems, an appropriately specified Finder DC-coil version should be selected.

16 A Changeover Contact for Flexible Power Switching

The Finder Type 40.61 features one changeover contact (1 CO / SPDT), providing three switching connections:

• Common (COM): The shared switching terminal.
• Normally closed (NC): Connected to common when the relay is de-energised.
• Normally open (NO): Connected to common when the relay is energised.

When the 12 V AC coil is energised, the relay transfers the common contact from the normally closed path to the normally open path. When coil power is removed, the relay returns to its normal position.

This arrangement supports applications such as equipment control, alarm switching, load isolation and changeover functions.

The 16 A rated contact current applies under specified conditions. Inductive loads, transformers, motors, capacitive circuits and LED drivers can generate significant switching transients or inrush currents. These applications must be checked against the relevant Finder load ratings rather than relying on the resistive-load current rating alone.

RT III Wash-Tight Construction for PCB Manufacturing

The .1000 suffix identifies a wash-tight RT III version of the Finder Series 40 relay.

RT III construction is intended to protect the relay's internal components during specified PCB cleaning operations. This is particularly useful in electronic manufacturing processes where assembled circuit boards may be cleaned after soldering.

For OEM manufacturers, wash-tight construction can simplify component selection when PCB production requires controlled washing procedures.

However, RT III does not mean that the relay is waterproof. It is not a substitute for a suitable electrical enclosure where equipment may be exposed to moisture, condensation, water spray or other environmental hazards.

PCB soldering and cleaning processes should always follow Finder's current manufacturing recommendations.

Electrical Isolation Between Coil and Contacts

The Finder Type 40.61 provides substantial separation between the control coil and switched contact circuit.

The relay incorporates 8 mm creepage and clearance and a specified 6 kV impulse withstand voltage between coil and contacts.

This supports applications where a low-voltage AC control circuit is used to operate a separate electrical load circuit.

Correct PCB layout, protective devices, conductor sizing and enclosure design remain essential. The relay's insulation specification must be considered as part of the complete equipment safety assessment.

Compact PCB and Socket Mounting

The Finder 40.61.8.012.1000 is designed for through-hole PCB mounting and compatible plug-in socket applications.

Its compact body measures approximately 29 × 12.4 × 25.1 mm, making it suitable for control boards where installation space is limited.

The Type 40.61 uses a 5 mm contact pin pitch. Designers should refer to the manufacturer's dimensional drawing to confirm the correct PCB footprint and mounting-hole arrangement.

Selected Finder Series 95 sockets provide additional mounting flexibility, including DIN rail installation where the correct socket is used.

When using a socket, check the socket's permissible current, insulation characteristics and mechanical compatibility. The socket rating may be lower than the relay's standalone contact rating.

Typical Applications

• Printed circuit board power switching.
• Industrial automation and machine control equipment.
• 12 V AC control circuits.
• Electronic appliance control boards.
• Building automation equipment.
• Heating, ventilation and air-conditioning control systems.
• Industrial monitoring and alarm circuits.
• Electrical control panels.
• OEM electronic manufacturing.
• PCB assemblies requiring wash-tight components.
• Compatible motor and actuator control circuits.
• Load changeover and interlocking circuits.
• Industrial maintenance and equipment repair.
• Replacement of matching Finder Series 40 relays.