Why Choose the Finder 55.34.9.048.0000T Industrial Plug-In Relay?
The Finder 55.34.9.048.0000T is a versatile 7 A, four-pole industrial electromechanical relay designed for electrical control panels, industrial automation, machinery and general-purpose switching applications. Part of the established Finder 55 Series, this miniature plug-in relay combines a 48 V DC coil, four independent changeover contacts and convenient socket-mounted construction.
Featuring a 4PDT (four-pole double-throw / 4 CO) contact configuration, the Finder 55.34.9.048.0000T allows four separate electrical circuits to be switched using a single control signal. Each contact set provides normally open, normally closed and common connections, making the relay particularly useful for auxiliary control, status signalling, equipment interlocking and multi-circuit switching.
This version is identified with an integrated LED indicator, helping technicians recognise when the relay's control supply is present. Its silver nickel (AgNi) contacts, 7 A rated switching current and compact 20.7 × 37.2 × 27.7 mm housing make it a practical choice for industrial electricians, control panel builders, maintenance engineers and OEM equipment manufacturers.
Key Advantages
- Four changeover contacts (4PDT / 4 CO) enable simultaneous switching of multiple electrical circuits.
- 48 V DC nominal coil for compatible industrial DC control systems.
- 7 A rated contact current supports appropriately rated industrial switching applications.
- 250 V AC rated contact voltage makes the relay suitable for a wide range of control loads.
- Integrated LED indication provides convenient visual confirmation of the control supply.
- Silver nickel (AgNi) contacts offer dependable general-purpose switching performance.
- Plug-in construction allows straightforward installation and replacement using a compatible relay socket.
- Four independent contact sets reduce the need for multiple separate switching relays.
- Compact miniature housing helps conserve space in electrical control cabinets.
- Monostable operation automatically returns the contacts to their normal positions when coil power is removed.
- 2.4 kΩ nominal coil resistance supports predictable DC control operation.
- Approximately 1 W coil consumption provides efficient electromagnetic switching.
- −40 to +85 °C operating temperature range supports demanding industrial environments.
- Compatible socket mounting simplifies maintenance and control panel servicing.
- Established Finder 55 Series design provides a practical solution for industrial automation and electrical equipment.
Key Features
- Finder 55 Series industrial relay.
- Type 55.34 four-pole plug-in relay.
- 48 V DC nominal coil voltage.
- 4PDT / 4 CO contact configuration.
- Four independent changeover contact sets.
- 7 A rated contact current.
- 250 V AC rated contact voltage.
- Silver nickel (AgNi) contact material.
- Integrated LED control supply indicator.
- 2,400 Ω nominal coil resistance.
- 20 mA nominal coil current.
- Approximately 1 W nominal coil consumption.
- 38.4–52.8 V DC standard coil operating range.
- Plug-in electrical connections.
- 14-pin relay arrangement.
- Monostable electromechanical operation.
- Polarity-free DC control arrangement.
- RT I environmental protection category.
- −40 to +85 °C operating ambient temperature.
- 20.7 mm housing width.
- 37.2 mm housing height.
- 27.7 mm housing depth.
- Compatible Finder 94 Series relay sockets, subject to socket selection.
Four-Pole Changeover Switching for Industrial Control
The Finder 55.34.9.048.0000T provides four independent changeover contact sets operated by a single 48 V DC electromagnetic coil. This arrangement is particularly useful where multiple control functions need to respond to the same switching signal.
Each contact set includes a common terminal, a normally closed terminal and a normally open terminal. When the relay coil is energised, each common contact transfers from its normally closed connection to its normally open connection. When coil power is removed, the contacts return to their normal positions.
The 4PDT configuration allows designers to control several circuits simultaneously. For example, one contact may be used for auxiliary load switching, another for status signalling and additional contacts for electrical control functions. All contact sets must remain within their specified voltage, current and load-category ratings.
Using a single four-pole relay can simplify control panel wiring compared with using multiple single-pole relays, while providing coordinated switching from one control input.
Integrated LED Indication for Easier Fault Diagnosis
The 55.34.9.048.0000T version includes an LED indicator, providing a convenient visual reference for the relay's control supply. This can be particularly useful during electrical panel commissioning, routine inspection and troubleshooting.
When checking an industrial control circuit, the LED helps technicians determine whether the relay is receiving its intended control signal. This can assist with identifying issues such as missing control voltage, incorrect wiring or faults elsewhere in the control system.
The LED indicates the electrical control condition and should not be treated as independent confirmation that the relay contacts have physically changed state. Where contact-state verification is required, suitable feedback circuitry and testing procedures should be used.
The 48 V DC coil is designed for compatible industrial DC control systems. Its nominal resistance of 2.4 kΩ results in a rated current of approximately 20 mA, corresponding to approximately 1 W of coil consumption.
The standard operating range for the 48 V DC coil is approximately 38.4–52.8 V DC, subject to the manufacturer's specified operating conditions. This range should be considered when selecting a control power supply and assessing voltage variations within the installation.
The relay uses monostable operation, meaning the contacts return to their normal positions when the coil is de-energised. This makes the Finder 55.34.9.048.0000T suitable for general-purpose switching, signalling and auxiliary control functions where predictable contact operation is required.
Convenient Plug-In Mounting and Maintenance
The Finder 55.34.9.048.0000T is designed for plug-in socket mounting, allowing the relay to be installed in a compatible socket without direct soldering. This arrangement is especially useful in industrial control panels where relays may require inspection, testing or replacement during maintenance.
Compatible Finder 94 Series sockets provide options for electrical panel installation, depending on the selected socket and mounting arrangement. Engineers should verify the socket's compatibility with the 55.34 relay, including its contact rating, terminal arrangement and intended installation method.
The compact 20.7 × 37.2 × 27.7 mm housing helps reduce the space required for four-pole switching. The plug-in construction also supports faster replacement of a compatible relay without rewiring the entire control circuit, provided the equipment has been safely isolated.
Typical Applications
- Industrial automation and machinery control systems.
- Electrical control panels and switchgear assemblies.
- 48 V DC auxiliary control circuits.
- Multi-circuit switching and changeover control.
- PLC interface and control relay applications using compatible outputs.
- Industrial equipment status signalling.
- Building management and automation systems.
- Heating, ventilation and air conditioning controls.
- Lighting control and auxiliary switching.
- Pump and fan control interfaces.
- Motor starter auxiliary control circuits.
- Process control and monitoring equipment.
- Electrical interlocking and signalling circuits.
- OEM machinery and electrical equipment.
- Maintenance and replacement of compatible Finder 55.34 relays.
