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  • New item   Interface relay | 2CO | 10 A | coil 24 V DC | plug-in | Releco C7-A20 24 V DC

    Interface relay | 2CO | 10 A | coil 24 V DC | plug-in | Releco C7-A20 24 V DC

    Code: C7-A20
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    Price 12.00 € VAT incl.
    ( 9.92 € VAT excl. )

    Releco C7-A20 24 V DC – interface relay with 2CO contacts (10 A) and 24 V DC coil. For control signal isolation, contact multiplication and control of contactor and valve coils in automation panels.

  • Product description

    Interface relay | 2CO | 10 A | coil 24 V DC | plug-in | Releco C7-A20 24 V DC

    Releco C7-A20 24 V DC is an interface relay with a 24 V DC coil and 2CO changeover contacts rated 10 A. It receives a weak control signal and switches another circuit through a galvanically isolated contact.

    Key point:
    24 V DC outputs of PLCs and controllers usually cannot drive a contactor coil, a valve or a 230 V circuit directly. A relay with a 24 V DC coil does it safely: the output only carries the coil current, while a separate contact switches the load.
    Contacts
    2CO (DPDT)
    Rated current
    10 A / 250 V AC
    Coil voltage
    24 V DC
    DC1 breaking capacity
    10 A / 30 V DC

    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 Releco C7-A20 24 V DC?
    Releco C7-A20 – a robust 2CO relay with 10 A AgNi contacts and flat (faston) terminals. Suits higher loads and DC circuits: 10 A at 30 V DC.

    Technical specifications

    Product type Interface (control) relay
    Manufacturer / code Releco C7-A20 (C7-A20/DC24V)
    Series Releco C7
    Coil voltage 24 V DC
    Coil power 1 W
    Operate / release voltage ≤0.8 Un / ≥0.1 Un
    Contacts 2CO (DPDT)
    Contact material AgNi
    Rated current 10 A (inrush current 30 A / 20 ms)
    Max. switching voltage 250 V AC
    Rated load AC1 2500 VA
    DC1 breaking capacity 10 A / 30 V · 0.5 A / 110 V · 0.2 A / 220 V
    Mechanical life ≥10 × 10⁶ cycles
    Insulation coil–contacts 2.5 kV (1 min)
    Operate / release time 16 ms / 8 ms
    Operating temperature −40…+60 °C
    Weight 43 g
    Mounting plug-in, socket-mounted (8 faston)
    Indication none (LED via socket module)
    Standards / approvals IEC/EN 61810, IEC/EN 60947
    Compatible sockets Releco S7-M, S7-I/O, S7-L, S7-P, S7-C, S7-PI

    Main functions

    • Galvanic isolation – the control circuit is protected from load circuit disturbances.
    • 2CO contacts – one signal can control a load and return a status signal.
    • Signal amplification – a weak PLC or controller output switches a 10 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?

    • Isolation and amplification of PLC outputs
    • Control of contactor and motor starter coils
    • Solenoid valve control
    • Signal transfer between systems with different voltages
    • Control panels of industrial machinery
    • Pumping stations, boiler rooms, ventilation units
    • Control of signal lamps and sirens

    Use by need

    Automation integrator.
    A reliable interface between PLC outputs and actuators, with standard numbering.
    Panel builder.
    Plug-in relay in a socket – fast installation and easy maintenance.
    Maintenance technician.
    Replace a faulty relay in seconds without disconnecting wires.

    Practical application

    If a PLC 24 V DC output has to switch on a contactor with a 230 V AC coil, the PLC output connects to relay coil A1–A2 and the contactor coil goes through the relay NO contact (11–14). A second contact set can return a status signal to a PLC input.

    Pros

    • Galvanic isolation of control and load circuits
    • Plug-in mounting – fast replacement
    • Standard contact numbering
    • Wide choice of sockets and accessories
    • AC1 load 2500 VA
    • 10 A DC1 at 30 V

    Cons / limitations

    • No LED (LED version – C7-A20X)
    • S7 series socket sold separately
    • 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

    2CO
    10 A / 250 V AC
    24 V DC
    Releco S7-M
    Suitable when you need:
    • to switch a 230 V load from a 24 V DC PLC output
    • to multiply control contacts
    • to isolate circuits at different voltages
    Check before use:
    • coil voltage and type (AC or DC)
    • load type and current (resistive, inductive, LED)
    • that you have a compatible socket: Releco S7-M, S7-I/O, S7-L, S7-P, S7-C, S7-PI
    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: Releco S7-M, S7-I/O, S7-L, S7-P, S7-C, S7-PI.
    Can the coil be powered at another voltage?
    No, the coil must match the control voltage and type – 24 V DC.
    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 2CO 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 | 2CO | 10 A | coil 24 V DC | plug-in | Releco C7-A20 24 V DC

    Releco C7-A20 24 V DC – interface relay with 24 V DC coil and 2CO contacts 10 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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