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  • New item   Interface relay | 4CO | 7 A | coil 230 V AC | plug-in | Finder 55.34.8.230.0040

    Interface relay | 4CO | 7 A | coil 230 V AC | plug-in | Finder 55.34.8.230.0040

    Code: 55.34.8.230.0040
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    Price 4.77 € VAT incl.
    ( 3.94 € VAT excl. )

    Finder 55.34.8.230.0040 – interface relay with 4CO contacts (7 A) and 230 V AC coil. For control signal isolation, contact multiplication and control of contactor and valve coils in automation panels.

  • Product description

    Interface relay | 4CO | 7 A | coil 230 V AC | plug-in | Finder 55.34.8.230.0040

    Finder 55.34.8.230.0040 is an interface relay with a 230 V AC coil and 4CO changeover contacts rated 7 A. It receives a weak control signal and switches another circuit through a galvanically isolated contact.

    Key point:
    A relay with a 230 V AC coil takes its control signal straight from a mains circuit – a programmer, thermostat, timer or switch. It is the simplest way to multiply contacts or isolate circuits in residential and commercial panels.
    Contacts
    4CO (4PDT)
    Rated current
    7 A / 250 V AC
    Coil voltage
    230 V AC
    Indication
    lockable test button and mechanical indicator

    Operating principle

    The relay plugs into a suitable socket on a DIN rail (or is soldered to a PCB). The control voltage is applied to coil terminals A1–A2.

    When current flows through the coil, the electromagnet pulls the armature and switches the contacts: the common contact (COM) leaves NC and closes to NO. When the control voltage drops, a spring returns the contacts to their initial position.

    Coil and contact circuits are galvanically isolated, so a weak control signal safely controls a circuit at another voltage.

    Why choose Finder 55.34.8.230.0040?
    Finder 55.34 – four changeover contacts rated 7 A in one housing and a lockable test button with mechanical indicator: during commissioning the relay can be operated manually without changing the circuit.

    Technical specifications

    Product type Interface (control) relay
    Manufacturer / code Finder 55.34.8.230.0040
    Series Finder 55 (55.34)
    Coil voltage 230 V AC
    Coil power 1.5 VA; 17 000 Ω; 6 mA
    Operate / release voltage 184…253 V; drop-out 0.2 Un
    Contacts 4CO (4PDT)
    Contact material AgNi
    Rated current 7 A (peak 15 A)
    Max. switching voltage 250 V AC
    Rated load AC1 1750 VA
    Load AC15 350 VA (230 V AC)
    DC1 breaking capacity 7 A / 24 V · 0.5 A / 110 V · 0.25 A / 220 V
    Mechanical life 20 × 10⁶ cycles
    Electrical life 150 × 10³ cycles (AC1)
    Insulation coil–contacts 2000 V AC; 4 kV (EN 61810-1)
    Operate / release time 9 ms / 5 ms
    Operating temperature −40…+85 °C
    Mounting plug-in, socket-mounted
    Indication lockable test button and mechanical indicator
    Protection class RT I
    Compatible sockets Finder 94.04 / 94.P4 / 94.54 / 94.74 (DIN), 94.14 (PCB)
    Accessories 99.02, 86.30, 094.91.3, 094.71

    Main functions

    • Galvanic isolation – the control circuit is protected from load circuit disturbances.
    • 4CO contacts – one signal can control a load and return a status signal.
    • Signal amplification – a weak PLC or controller output switches a 7 A load.
    • Plug-in mounting – fast replacement without disconnecting wires.
    • Voltage conversion – control at one voltage, load at another (e.g. 24 V → 230 V).

    Where is it used?

    • Control from a 230 V programmer, thermostat or timer
    • Contact multiplication in residential and commercial panels
    • Contactor coil control
    • Control of lighting and ventilation groups
    • Interlocks between circuits
    • Control of pumps and heating equipment
    • Alarm and signalling circuits

    Use by need

    Electrician.
    Contact multiplication and circuit isolation without a separate control supply.
    Building manager.
    Control lighting, ventilation or pumps from an existing programmer.
    Panel assembler.
    Standard plug-in relay with widely available sockets.

    Practical application

    If a 230 V timer has to switch two separate circuits at once (e.g. ventilation and lighting), the timer output connects to the 230 V AC relay coil, and both circuits go through separate relay contacts that are galvanically isolated from each other.

    Pros

    • Galvanic isolation of control and load circuits
    • Plug-in mounting – fast replacement
    • Standard contact numbering
    • Wide choice of sockets and accessories
    • 4CO – four independent circuits from one signal
    • Lockable test button and mechanical indicator

    Cons / limitations

    • No LED – visual indication requires a 99.02 socket module
    • Limited DC breaking: 0.5 A at 110 V DC
    • Not a protective device – does not protect against overload or short circuit
    • Inductive loads need a suppression circuit (diode, RC or varistor)
    • Use a contactor for motors and large loads

    Safety and installation notes

    • Disconnect the supply before installation and verify absence of voltage.
    • Check coil voltage and type (AC/DC) – a wrong coil will not operate or will burn out.
    • Suppress inductive loads (coils, valves) with a diode (DC) or RC circuit / varistor (AC).
    • Protect the contact circuit with a circuit breaker or fuse.
    • Do not exceed rated current and voltage; in DC circuits allow for the lower breaking current.

    Quick selection guide

    4CO
    7 A / 250 V AC
    230 V AC
    socket Finder 94.04
    Suitable when you need:
    • control from a 230 V programmer, thermostat or timer
    • to multiply contacts in a residential panel
    • to build interlocks between circuits
    Check before use:
    • coil voltage and type (AC or DC)
    • load type and current (resistive, inductive, LED)
    • that you have a compatible socket: Finder 94.04 / 94.P4 / 94.54 / 94.74 (DIN), 94.14 (PCB)
    Important reminder: an interface relay is not a protective device. It does not protect against overload or short circuit, and motors and large loads require a contactor.

    FAQ

    Do I need a socket?
    Yes, a plug-in relay needs a socket for DIN rail mounting; compatible: Finder 94.04 / 94.P4 / 94.54 / 94.74 (DIN), 94.14 (PCB).
    Can the coil be powered at another voltage?
    No, the coil must match the control voltage and type – 230 V AC.
    Is it suitable for driving a contactor coil?
    Yes, that is one of the most common uses; a suppression circuit is recommended.
    Can a motor be connected directly?
    No, connect the motor through a contactor with thermal protection; the relay drives the contactor coil.
    What does 4CO mean?
    It is the number of changeover contact sets; each has COM, NC and NO.
    Do you help with selection?
    Yes, send us a diagram or equipment list – we will select relays, sockets and contactors.

    Interface relay | 4CO | 7 A | coil 230 V AC | plug-in | Finder 55.34.8.230.0040

    Finder 55.34.8.230.0040 – interface relay with 230 V AC coil and 4CO contacts 7 A, for signal isolation, contact multiplication and control of contactors and valves in automation and electrical panels.

    Published: 2026-11-05 · Data verified against the manufacturer datasheet: 2026-11-05

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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