Finder 55.34.8.125.5040 – 55 Series Industrial relays

Why Choose the Finder 55.34.8.125.5040 125 V AC 7 A Industrial Plug-In Relay?

The Finder 55.34.8.125.5040 is a versatile four-pole industrial electromechanical relay from the Finder Series 55 range, designed for reliable auxiliary switching, industrial automation, machinery control and electrical panel applications. Featuring a 125 V AC operating coil, four changeover contacts (4 CO / 4PDT) and gold-plated silver-nickel contacts (AgNi + Au), this relay provides a practical switching solution for control circuits requiring multiple independently wired contacts.

The 55.34 configuration provides four changeover poles operated by a common electromagnetic coil. Each pole incorporates a common, normally open and normally closed connection, allowing one control signal to operate several switching or signalling circuits simultaneously. This arrangement is particularly useful for equipment status indication, auxiliary interlocking, control logic and multi-circuit automation interfaces.

As a plug-in relay, the Finder 55.34.8.125.5040 is designed for installation in a compatible Finder relay socket. Its removable construction simplifies servicing and replacement, while the gold-plated contact option makes it particularly suitable for applications where dependable low-level signal switching is important.

Key Advantages

• 125 V AC operating coil supports compatible AC industrial control circuits.
• Four changeover contacts allow multiple control and signalling functions from one relay.
• 7 A rated contact current supports appropriately rated electrical switching loads.
• Gold-plated silver-nickel contacts offer suitable contact characteristics for low-level switching applications.
• 4PDT contact arrangement provides normally open and normally closed switching on each pole.
• Plug-in construction enables convenient replacement without disconnecting the socket's fixed wiring.
• Compact industrial design supports efficient use of control-panel space.
• 250 V AC rated contact voltage supports a wide range of auxiliary control applications.
• Monostable operation returns the contacts to their normal state when the coil is de-energised.
• Socket compatibility enables integration into DIN rail-mounted relay assemblies using appropriate Finder accessories.
• Suitable for industrial automation, machinery control, signalling and electrical interlocking.

Key Features

• Finder Series 55 general-purpose industrial relay.
• Finder Type 55.34 four-pole configuration.
• 125 V AC nominal coil voltage.
• AC electromagnetic coil operation.
• Four changeover contacts (4 CO).
• Four-pole double-throw (4PDT) contact arrangement.
• 7 A rated contact current.
• 250 V AC rated contact voltage.
• Gold-plated silver-nickel contact material (AgNi + Au).
• Independent common, normally open and normally closed terminals for each pole.
• Plug-in terminals for compatible Finder relay sockets.
• Suitable for DIN rail mounting when installed in an appropriate socket.
• Electromechanical, non-latching switching operation.
• Suitable for low-level control signals and appropriately rated auxiliary loads.

Installation note: Select the appropriate Finder socket for the 55.34 relay configuration and verify the coil supply, load characteristics and switching requirements before installation. Gold-plated contacts are particularly useful for low-level circuits; switching higher electrical loads may alter the gold contact surface and affect subsequent low-level switching performance.

Reliable Four-Pole Switching with Gold-Plated Contacts

The Finder 55.34.8.125.5040 uses a 125 V AC electromagnetic coil to operate four changeover contacts simultaneously. When the coil is energised, the internal mechanism transfers each common contact from its normally closed terminal to its normally open terminal. When the control voltage is removed, the relay returns to its normal contact position.

The gold-plated AgNi contact system distinguishes this version from standard silver-nickel contact variants. Gold plating provides a contact surface suited to low-level switching, where stable contact behaviour is important for reliable signalling and monitoring. This makes the relay useful for industrial control systems incorporating auxiliary signals, control logic and equipment-status feedback.

Its four independent changeover poles allow several circuits to be switched by a single control signal. For example, the relay can simultaneously provide control outputs, equipment status signals and interlocking functions, provided the circuits remain within the applicable electrical and insulation ratings.

The relay's plug-in design also supports efficient maintenance. When installed in a compatible socket, the relay can be removed and replaced without disturbing the socket's permanent wiring, helping reduce servicing time in industrial control cabinets.

For inductive loads such as contactor coils, solenoids and motors, the designer should consider inrush current, electrical endurance, contact protection and switching transients. The applicable manufacturer ratings must always be observed.

Typical Applications

• Industrial automation and machinery control.
• Low-level signal switching and monitoring.
• Electrical control panels and relay cabinets.
• Auxiliary control and signalling circuits.
• Electrical interlocking arrangements.
• Equipment status indication and feedback.
• Building management and HVAC control equipment.
• Industrial alarm and monitoring systems.
• OEM machinery and electrical control assemblies.
• Maintenance and replacement of compatible industrial relays.