Finder 55.33.8.400.0000 – 55 Series Industrial relays

Why Choose the Finder 55.33.8.400.0000 Industrial Relay?

The Finder 55.33.8.400.0000 is a general-purpose electromechanical relay from the Finder 55 Series, designed for reliable switching in industrial automation, machinery control and electrical panel applications. Featuring a 400 V AC operating coil and three changeover contacts (3 CO / 3PDT), this relay provides flexible control of multiple electrical circuits from a single control signal.

The Finder 55.33 relay family is recognised for its compact plug-in construction, versatile contact arrangement and suitability for industrial control systems. Its three independent changeover contact sets allow normally open and normally closed switching functions to be combined within one relay, making it useful for auxiliary control, signalling, interlocking and equipment automation.

With a 10 A rated contact current, 250 V AC rated contact voltage and compatibility with suitable Finder 94 Series sockets, the Finder 55.33.8.400.0000 offers a practical solution for professional control panel builders, electrical engineers and industrial maintenance teams requiring a high-voltage AC-operated relay.

Key Advantages

• 400 V AC operating coil for compatible high-voltage AC control circuits.
• Three changeover contacts (3 CO / 3PDT) for versatile multi-circuit switching.
• 10 A rated contact current for appropriately rated electrical loads.
• 250 V AC rated contact voltage for industrial switching applications.
• Three independent contact sets allow multiple control functions from one relay.
• Plug-in construction supports convenient installation and replacement.
• Finder 94 Series socket compatibility provides flexible panel mounting options.
• Monostable operation returns contacts to their normal positions when the coil is de-energised.
• Compact industrial housing helps conserve space in electrical control cabinets.
• Electromechanical isolation separates the coil circuit from the switched contact circuits.
• Versatile switching arrangement supports control, indication and interlocking duties.
• Established Finder 55 Series design supports industrial maintenance and replacement applications.

Key Features

• Finder 55 Series general-purpose industrial relay.
• 55.33 three-pole changeover relay configuration.
• 400 V AC nominal operating coil.
• AC coil operation at 50/60 Hz.
• Three changeover contacts (3 CO / 3PDT).
• Three normally open and three normally closed contact paths.
• 10 A rated contact current.
• 250 V AC rated contact voltage.
• Electromechanical switching mechanism.
• Monostable, non-latching relay operation.
• Standard plug-in terminal arrangement.
• Compatible with appropriate Finder 94 Series relay sockets.
• Suitable for socket-mounted DIN-rail assemblies.
• Multiple switching functions from a single coil.
• Suitable for industrial automation and auxiliary control applications.
• Replaceable relay construction for simplified servicing.

Reliable Three-Pole Changeover Switching

The Finder 55.33.8.400.0000 uses a 400 V AC electromagnetic coil to operate three changeover contact sets simultaneously. When the coil is energised, each common contact transfers from its normally closed terminal to its normally open terminal. When the coil is de-energised, the contacts return to their normal positions.

This 3 CO / 3PDT configuration enables a single relay to perform several related switching functions. For example, one contact set may control an auxiliary circuit while the other two provide signalling, interlocking or additional equipment control.

The arrangement is particularly useful in electrical control panels where several circuits must respond to the same control signal. The relay provides electrical separation between its operating coil and switched contact circuits, allowing different control functions to be coordinated through one electromechanical device.

When selecting the relay, engineers should verify the connected load type, switching current, operating voltage and relevant utilisation category. Inductive loads, motors and DC circuits may require lower switching currents than the nominal resistive contact rating.

400 V AC Coil for Industrial Control Systems

The 400 V AC coil distinguishes this variant from the more common low-voltage Finder 55 Series relays. It is intended for control systems designed to supply the specified alternating-current coil voltage and frequency.

Because the relay uses an AC-operated coil, it must not be substituted directly for a DC-coil version. The supply voltage, operating frequency and control circuit protection should be checked before installation.

For reliable operation, the relay should be installed in an appropriately rated socket and enclosure, with wiring and protective devices selected according to the applicable electrical installation requirements.

Plug-in Installation and Maintenance

The Finder 55.33.8.400.0000 features a plug-in terminal arrangement designed for use with compatible Finder 94 Series sockets. This construction allows the relay to be removed and replaced without disconnecting the socket wiring, reducing maintenance time in industrial control installations.

Suitable sockets provide the required electrical terminals and may support mounting on a standard DIN rail. Socket selection must account for the three-pole relay configuration, coil voltage, terminal arrangement and intended installation conditions.

The relay's compact construction and three changeover contacts make it a practical choice for control cabinets where multiple switching functions are required but available mounting space is limited.

Typical Applications

• Industrial automation and machinery control systems.
• Electrical control cabinets and relay panels.
• High-voltage AC auxiliary control circuits.
• Motor starter and contactor auxiliary switching.
• Industrial signalling and status indication.
• Control circuit sequencing and interlocking.
• Building services and HVAC control equipment.
• Manufacturing machinery and production systems.
• Electrical distribution control assemblies.
• Industrial equipment monitoring circuits.
• OEM machinery and electrical equipment.
• Replacement of compatible Finder 55.33 relays.