55.34.9.012.2040 Finder Miniature plugin relay 4 pole 7A DC 12V

Why Choose the Finder 55.34.9.012.2040 General Purpose Relay?

The Finder 55.34.9.012.2040 is a 12 V DC, 7 A industrial plug-in relay from the Finder 55 Series. Designed for industrial automation, machinery control and electrical panel applications, it combines four changeover contacts (4 CO / 4PDT) with a lockable test button and mechanical status indicator, providing flexible switching and convenient operational monitoring.

With a 12 V DC operating coil, the Finder 55.34.9.012.2040 allows one low-voltage control signal to operate four changeover contact sets simultaneously. Each set provides common, normally open and normally closed connections, making this relay suitable for auxiliary switching, equipment signalling, control logic and electrical interlocking.

The relay features silver cadmium oxide (AgCdO) contacts and a plug-in connection designed for a compatible Finder 94 Series socket. Its compact housing, approximately 20.7 mm wide, 37.2 mm high and 27.7 mm deep, makes it suitable for control cabinets where reliable switching, convenient replacement and visual indication are important.

Key Advantages

• 12 V DC coil for compatible low-voltage control systems.
• Four changeover contacts (4 CO / 4PDT) for flexible multi-circuit switching.
• 7 A rated contact current for appropriately specified electrical loads.
• Lockable test button for controlled manual operation during commissioning and maintenance.
• Mechanical status indicator for visual identification of relay contact operation.
• Silver cadmium oxide (AgCdO) contacts for the specified ordering variant.
• Plug-in construction supports straightforward installation and replacement.
• Compatible with appropriately selected Finder 94 Series sockets.
• Four contact sets can be operated by one relay coil.
• Monostable operation returns the contacts to their normal state when the coil is de-energised.
• Compact construction helps conserve control cabinet space.
• Suitable for industrial automation, machinery, signalling and auxiliary control.
• Part of Finder's established 55 Series general purpose relay range.

Key Features

• Finder 55.34 industrial electromechanical relay.
• Manufacturer part number: 55.34.9.012.2040.
• Alternative reference: 553490122040.
• Nominal coil voltage: 12 V DC.
• Contact arrangement: 4 CO / 4PDT.
• Rated contact current: 7 A.
• Rated contact voltage: 250 V AC.
• Maximum AC switching voltage: 400 V AC.
• Contact material: AgCdO.
• Lockable test button: Included.
• Mechanical indicator: Included.
• Mounting: Plug-in socket.
• Operating principle: Monostable.
• Environmental protection category: RT I.
• Nominal coil power: Approximately 1 W.
• Compact housing: Approximately 20.7 × 37.2 × 27.7 mm.

Four-Pole Switching with Lockable Test Button and Mechanical Indication

The Finder 55.34.9.012.2040 is designed for electrical systems requiring four separate changeover switching functions operated by one 12 V DC coil. Its 4PDT contact arrangement provides flexibility for control logic, equipment status circuits, auxiliary switching and electrical interlocking.

Each contact set has a common terminal, a normally open contact and a normally closed contact. Energising the relay coil changes the state of all four contact sets simultaneously. When the coil is de-energised, the relay returns to its normal position, providing conventional monostable switching behaviour.

A distinguishing feature of the .2040 variant is its lockable test button and mechanical indicator. The test button allows an authorised technician to operate the relay contacts manually for suitable commissioning and maintenance procedures, while the mechanical indicator provides a visual indication of the relay's operated state. The test button must be used in accordance with the manufacturer's safety instructions, particularly where manual operation could energise connected equipment.

The relay's 7 A contact rating offers useful switching capability for suitable electrical loads. However, this rating is not universal across all load types. Inductive loads, motors, contactor coils and equipment with high inrush currents can impose additional demands on relay contacts. Engineers should check the relevant AC1, AC15 and DC switching ratings before specifying the relay.

The 12 V DC coil requires a compatible DC power supply or controller output. The standard coil power is approximately 1 W, corresponding to a nominal current of around 86 mA. PLC outputs and other electronic switching devices should be checked for sufficient current capacity and appropriate protection against coil switching transients.

The plug-in design allows the Finder 55.34.9.012.2040 to be installed in a suitable Finder 94 Series relay socket. This modular arrangement is useful in control cabinets because it allows a relay to be removed or replaced without disturbing permanently wired socket terminals. The socket is selected separately and should not be assumed to be included.

The AgCdO contact material is an important feature of this exact ordering variant. Silver cadmium oxide contains cadmium, so environmental compliance requirements should be considered where relevant. Alternative contact materials may be available within the Finder 55 Series, but they should not be substituted without confirming electrical and mechanical compatibility.

When replacing an existing relay, the complete 55.34.9.012.2040 reference should be checked. The closely related 55.34.9.012.2000 shares the same nominal coil voltage, contact arrangement and contact material but does not have the same lockable test-button and mechanical-indicator option. These differences may be important for maintenance and operational requirements.

Typical Applications

• Industrial electrical control panels and automation cabinets.
• 12 V DC control and auxiliary switching circuits.
• Machinery and OEM equipment control systems.
• Four-pole changeover switching applications.
• Electrical interlocking and control logic.
• Equipment status and alarm signalling.
• Industrial process control installations.
• Building services and electrical control equipment.
• Socket-mounted relays requiring manual test functionality.
• Maintenance and replacement of compatible Finder 55.34 relays.