40.61.7.012.4321 Finder Miniature PCB relay 1pole 16A DC 12V

Finder 40.61.7.012.4321 – 12 V DC 16 A Miniature Power Relay, 1CO

The Finder 40.61.7.012.4321 belongs to the Finder 40 Series of miniature PCB and plug-in power relays, developed for electrical switching in industrial automation, electronic equipment and control systems. The 40.61 relay design combines a 16 A rated contact current, 12 V DC sensitive coil and compact construction suitable for space-conscious electrical assemblies.

Featuring a single changeover contact (1CO / SPDT), the Finder 40.61 relay family provides normally open and normally closed switching functions through one common contact. This arrangement enables a low-voltage control circuit to operate a separate electrical load or transfer a signal between two circuits.

The 12 V DC sensitive coil offers efficient electromagnetic operation, while the miniature housing supports integration into electronic control boards and compatible relay mounting systems. The 40.61 family is particularly useful where a relatively high contact current must be controlled using a compact relay.

The 40.61.7.012.4321 ordering suffix identifies a specific manufacturer configuration. Its exact contact material, environmental protection classification and terminal variant should be checked against the product-specific Finder documentation before substitution or production use.

Key Advantages

• 16 A rated contact current for compatible electrical loads.
• 12 V DC sensitive coil for low-voltage control circuits.
• One changeover contact (1CO / SPDT) for flexible switching.
• 500 mW nominal coil consumption for efficient operation.
• Monostable operation provides a defined de-energised contact position.
• Compact miniature housing helps minimise equipment space requirements.
• 250 V AC rated contact voltage for suitable AC applications.
• 4,000 VA AC-1 switching capacity within the published family rating.
• Reinforced coil-to-contact insulation supports electrical separation.
• 6 kV impulse withstand capability between coil and contacts.
• 8 mm coil-to-contact creepage and clearance design.
• Fast electromechanical operation for control applications.
• Compact PCB and plug-in relay format within the 40 Series.
• Wide operating temperature range for industrial environments.
• Suitable for automation, machinery and electronic control assemblies.

Key Features

• Finder 40 Series miniature power relay.
• Type 40.61 single-pole configuration.
• 12 V DC nominal coil voltage.
• Sensitive DC coil design.
• Approximately 500 mW coil power.
• Approximately 288 Ω nominal coil resistance.
• Approximately 41.7 mA calculated nominal coil current.
• One changeover contact (1CO).
• SPDT / Form C switching arrangement.
• 16 A rated contact current.
• 30 A maximum peak contact current for the standard 40.61 family configuration.
• 250 V AC rated switching voltage.
• 400 V AC maximum switching voltage.
• 4,000 VA rated AC-1 load.
• 750 VA AC-15 rating at 230 V AC.
• 0.55 kW single-phase motor rating at 230 V AC.
• Monostable, non-latching operation.
• Reinforced coil-to-contact insulation.
• 6 kV coil-to-contact impulse withstand.
• 5 mm contact terminal pitch.
• Compact approximately 29 × 12.4 × 25 mm housing.
• PCB or compatible socket integration, subject to the exact terminal configuration.

How the Finder 40.61.7.012.4321 Relay Works

The Finder 40.61.7.012.4321 uses an electromagnetic coil to operate a mechanical switching contact. The 12 V DC coil acts as the control input, while the relay contacts form a separate circuit for switching an appropriately rated electrical load.

In the standard 40.61 changeover arrangement, the common contact is connected to the normally closed terminal when the coil is de-energised. Applying the specified DC voltage energises the coil and moves the common contact to the normally open terminal.

When coil power is removed, the relay returns to its normal position. This monostable operating principle is useful for control circuits where the switching state must follow the presence or absence of the control voltage.

The relay's sensitive DC coil has a nominal power consumption of approximately 500 mW. At a nominal voltage of 12 V DC, its approximate 288 Ω resistance corresponds to a coil current of 41.7 mA.

Although the coil operates at low voltage, it should be driven using a control circuit capable of providing the required current. Where a microcontroller or PLC transistor output cannot directly supply the coil, a suitable relay driver, transistor or MOSFET arrangement can be used.

Appropriate coil transient suppression should be considered when switching the relay with semiconductor electronics. A flyback diode or another suitable suppression device can help protect the control circuit, although suppression components may affect the relay's release time.

16 A Switching Performance

The Finder 40.61 relay family is designed for electrical switching applications requiring a relatively high contact rating in a compact component. Its published specifications include a 16 A rated current and a 4,000 VA AC-1 switching capacity.

For industrial control loads, the permissible switching current depends on the relevant utilisation category. The standard family specifications include an AC-15 rating of 750 VA at 230 V AC, which is different from the resistive AC-1 rating.

DC switching also requires careful consideration because interrupting a DC circuit can be more demanding than switching an equivalent AC load. The published 40.61 DC-1 breaking capacities decrease as the switching voltage increases.

Loads such as LED drivers, electronic power supplies, transformers, motors and solenoids can generate high inrush currents or inductive switching transients. These characteristics must be checked against the relevant Finder load ratings and switching curves before selecting the relay.

The 400 V AC maximum switching voltage is an upper voltage limit, not a statement that the relay can switch its full 16 A rated current at 400 V AC.

PCB Mounting and Socket Integration

The Finder 40.61 family is designed for compact installation within electronic and industrial control assemblies. Its approximate 29 × 12.4 × 25 mm housing and 5 mm contact terminal pitch support space-efficient equipment design.

When installed directly onto a PCB, the circuit board must provide sufficient conductor width, copper thickness, electrical clearance and thermal performance for the intended load current.

Compatible Finder 95 Series sockets may provide alternative mounting arrangements, including certain DIN rail installations. However, the exact socket must be selected using the manufacturer's compatibility information for the 40.61.7.012.4321 terminal variant.

The 40.61 family incorporates reinforced coil-to-contact insulation, including a published 6 kV impulse withstand rating. The finished equipment must still meet the applicable electrical safety requirements, including suitable insulation, overcurrent protection and protection against accidental contact.

Before using this exact part number as a replacement, engineers should confirm the .4321 suffix-specific construction. Matching the coil voltage and rated current alone does not establish mechanical or electrical interchangeability.

Typical Applications

• Industrial automation control boards.
• 12 V DC relay control circuits.
• PCB-mounted power switching assemblies.
• Machine control equipment.
• Electrical signal changeover circuits.
• Building automation controllers.
• Industrial monitoring and alarm equipment.
• Electronic power management systems.
• Control of appropriately rated auxiliary loads.
• Remote electrical switching systems.
• Electronic instrumentation.
• Embedded control equipment.
• Electrical distribution control electronics.
• Industrial equipment maintenance.
• Professional PCB and control system manufacturing.