40.61.8.024.1000 Finder Miniature PCB relay 1pole 16A 24V

Why Choose the Finder 40.61.8.024.1000 16 A PCB Power Relay?

The Finder 40.61.8.024.1000 is a compact 16 A, 24 V AC miniature electromechanical power relay from the Finder Series 40 range. Designed for printed circuit boards, electrical control systems and industrial automation equipment, it combines a high-current changeover contact with a dependable AC-operated coil.

Featuring one changeover contact (1 CO / SPDT), the relay allows a common connection to switch between normally closed and normally open circuits. Its 16 A rated contact current, 250 V AC rated contact voltage and 4000 VA AC-1 switching capacity make it suitable for a wide range of compatible electrical loads.

The 24 V AC coil operates at 50/60 Hz and has a nominal consumption of approximately 1.2 VA. This makes the relay particularly useful in control systems that use 24 V AC transformers, including building services equipment, machinery and industrial electrical installations.

The 40.61.8.024.1000 also features silver nickel (AgNi) contacts, a compact PCB and plug-in construction, and an RT II flux-proof enclosure classification. Its miniature dimensions allow integration into equipment where installation space is limited.

Key Advantages

• 16 A rated contact current for compatible electrical power-switching applications.
• 24 V AC coil for low-voltage AC control circuits operating at 50/60 Hz.
• Single changeover contact (1 CO / SPDT) for flexible normally open and normally closed switching.
• Silver nickel (AgNi) contacts for dependable electromechanical switching.
• 250 V AC rated contact voltage for suitable mains-voltage circuits.
• 400 V AC maximum switching voltage under specified conditions.
• 4000 VA AC-1 switching capacity for compatible resistive loads.
• Approximately 1.2 VA coil consumption for efficient AC control operation.
• RT II flux-proof construction for suitable PCB soldering processes.
• Compact 29 × 12.4 × 25 mm housing for space-efficient electronic assemblies.
• 5 mm contact pin pitch for compatible PCB layouts.
• Monostable operation for automatic contact return when coil power is removed.
• PCB and socket mounting flexibility using compatible Finder accessories.

Key Features

• Finder Series 40 miniature power relay.
• Type 40.61 single-pole changeover design.
• Manufacturer part number: 40.61.8.024.1000.
• 16 A rated contact current.
• 24 V AC nominal coil voltage.
• 50/60 Hz AC coil operation.
• 1 CO / SPDT contact arrangement.
• Silver nickel (AgNi) contact material.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage.
• 4000 VA rated AC-1 switching capacity.
• Approximately 1.2 VA nominal coil consumption.
• 320 Ω nominal coil resistance.
• RT II flux-proof enclosure classification.
• Compact through-hole PCB and plug-in construction.
• 5 mm contact pin pitch.
• Monostable, non-latching operation.
• Suitable for compatible Finder Series 95 socket arrangements.

Technical note: The 16 A contact rating and 4000 VA AC-1 capacity apply under specified electrical conditions. Inductive, capacitive and high-inrush loads require separate assessment. The maximum switching voltage is not a continuous operating recommendation, and compatible socket ratings may be lower than the relay's standalone rating.

24 V AC Coil for Industrial and Building Control Systems

The Finder 40.61.8.024.1000 uses a 24 V AC coil designed for operation at 50/60 Hz.

Low-voltage AC control supplies are widely used in electrical control panels, building services installations and automation equipment. A 24 V AC relay can therefore be useful where a control transformer provides the operating supply.

The relay's nominal coil resistance is 320 Ω, with a nominal apparent power consumption of approximately 1.2 VA.

When selecting the control transformer, designers should account for the relay coil's apparent power requirements, transformer regulation, voltage drop in the wiring and any other loads connected to the same supply.

Important: This is an AC-coil relay. It should not be substituted for a 24 V DC version simply because the nominal voltage is the same. AC and DC coils have different electrical characteristics and must be matched to the control supply.

16 A SPDT Changeover Contact for Flexible Switching

The Finder Type 40.61 incorporates one changeover contact, also known as a single-pole double-throw (SPDT) contact.

The contact arrangement provides three electrical connections:

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

When the 24 V AC coil is energised, the relay transfers the common connection from the normally closed contact to the normally open contact. When the coil supply is removed, the contacts return to their original position.

This allows the relay to be used for load switching, electrical changeover, interlocking and signalling functions.

The 16 A rated contact current is suitable for compatible loads within the manufacturer's specified ratings. However, motors, transformers, solenoids, LED drivers and capacitive equipment may produce significant inrush currents or switching transients.

These applications should be assessed against the relevant load-specific switching characteristics rather than the resistive-load current rating alone.

Silver Nickel Contacts for Reliable Electrical Switching

The Finder 40.61.8.024.1000 uses silver nickel (AgNi) contacts.

Silver nickel is a widely used contact material in electromechanical relays, offering a practical combination of electrical conductivity, mechanical durability and resistance to contact wear under suitable operating conditions.

AgNi contacts are used in a range of industrial control and general-purpose switching applications.

The suitability of the contact material depends on the electrical load. Low-level signals, highly inductive loads and circuits with substantial inrush current may require different contact specifications or additional protective components.

For replacement applications, the contact material should be considered alongside the coil voltage, contact arrangement and mounting dimensions.

RT II Flux-Proof Construction for PCB Assembly

The 40.61.8.024.1000 has an RT II flux-proof enclosure classification.

Flux-proof construction is intended to help protect the relay's internal components against flux penetration during appropriate PCB soldering processes.

This is particularly useful in electronic manufacturing, where relays may be fitted to printed circuit boards alongside other through-hole components.

It is important to distinguish RT II flux-proof from RT III wash-tight construction.

An RT II relay should not automatically be subjected to PCB washing processes intended for wash-tight components. Manufacturers should follow Finder's current soldering and cleaning recommendations to avoid damaging the relay.

Compact PCB and Socket Mounting Options

The Finder 40.61.8.024.1000 is designed for through-hole PCB mounting and compatible plug-in socket arrangements.

Its approximate dimensions of 29 × 12.4 × 25 mm make it suitable for electronic assemblies where installation space is limited.

The relay uses a 5 mm contact pin pitch. The correct PCB footprint should be confirmed using the manufacturer's dimensional drawing before board manufacture.

Compatible Finder Series 95 sockets may also be used to provide plug-in installation and easier relay replacement.

Where a socket is used, its current rating, terminal capacity, insulation characteristics and mechanical compatibility must be checked. The permissible current through a socket may be lower than the relay's 16 A contact rating.

Typical Applications

• Industrial automation and machine control equipment.
• 24 V AC control circuits.
• Printed circuit board power switching.
• Building automation systems.
• Heating, ventilation and air-conditioning control equipment.
• Electrical control panels.
• Electronic appliance control boards.
• Industrial monitoring and signalling circuits.
• Compatible actuator and valve control systems.
• Load changeover and interlocking circuits.
• OEM electronic manufacturing.
• Power supply and load switching assemblies.
• Maintenance and repair of industrial electronic equipment.
• Replacement of matching Finder Series 40 relays.