Products catalog

Home/Product Catalog/Automation and Control Systems/Automation and Electrical Control Components | Contactors | Relays | SSR | Accessories/Intermediate relays for automation | for PLC and electrical control panels
  • New item   Plug-in relay | 24 V DC coil | 1CO (SPDT) | 6 A | 250 V AC/DC | Phoenix Contact REL-MR-24DC/21 | 2961105

    Plug-in relay | 24 V DC coil | 1CO (SPDT) | 6 A | 250 V AC/DC | Phoenix Contact REL-MR-24DC/21 | 2961105

    Code: 2961105
    Inquire about this item
    Price 5.24 € VAT incl.
    ( 4.33 € VAT excl. )

    Phoenix Contact REL-MR-24DC/21 (2961105): plug-in miniature relay, 24 V DC coil, 1CO AgSnO 6 A, up to 250 V AC/DC.

  • Product description

    Plug-in relay | 24 V DC coil | 1CO (SPDT) | 6 A | 250 V AC/DC | Phoenix Contact REL-MR-24DC/21 | 2961105

    Phoenix Contact REL-MR-24DC/21 (2961105) is a plug-in miniature power relay with one changeover contact and a 24 V DC coil. It is designed for Phoenix Contact PLC series 6.2 mm relay bases and can also be mounted on a printed circuit board.

    Key point:
    This is a replaceable industrial interface relay element: when a relay fails in a PLC-BSC base, only the relay is replaced while the wiring stays connected. AgSnO contacts and a 6 A continuous current suit typical PLC output loads.
    Coil
    24 V DC, 7 mA
    Contact
    1CO (1 PDT), AgSnO
    Continuous current
    6 A
    Max. switching voltage
    250 V AC/DC

    Operating principle

    The relay plugs into a Phoenix Contact PLC series base (e.g. PLC-BSC-24DC/21) or is soldered onto a PCB. The base is mounted on a DIN rail and connected to the controller and the load.

    When 24 V DC is applied to the coil (typical current 7 mA), the contact changes over in about 5 ms: the common terminal connects to the NO output.

    Result: the PLC output is loaded only by the 7 mA coil current, while loads up to 6 A are switched by an isolated contact.

    Why choose the Phoenix Contact REL-MR-24DC/21?
    The low coil current does not strain PLC outputs, and the plug-in format with PLC bases allows the relay to be replaced without disconnecting wires.

    Technical specifications

    Product type Plug-in miniature electromechanical relay
    Manufacturer / code Phoenix Contact / 2961105
    Model REL-MR-24DC/21
    Rated coil voltage 24 V DC
    Typical coil current 7 mA
    Coil resistance 3390 Ω ± 10 % (20 °C)
    Typical operate time 5 ms
    Contact configuration 1CO (1 PDT)
    Contact material AgSnO
    Continuous contact current 6 A
    Max. switching voltage 250 V AC/DC
    Min. switching current 10 mA (at 12 V)
    Mechanical service life 2 × 10⁷ cycles
    Sealing class RT III
    Connection plug-in / solder
    Compatible bases Phoenix Contact PLC series bases, e.g. PLC-BSC-24DC/21
    Standards EN 61810-1; UL / cUL Recognized, VDE

    Key functions

    • Signal isolation – separates the PLC output from the load circuit.
    • Low coil current (7 mA) – minimal load on PLC outputs.
    • Plug-in format – the relay is replaced in the base without disconnecting wires.
    • AgSnO contacts – suitable for power switching up to 6 A.
    • Sealed RT III housing – also suitable for PCB soldering with washing.

    Where is it used?

    • PLC output interface modules (Phoenix Contact PLC-INTERFACE)
    • Control cabinets and machine automation
    • Replacement of a failed relay in a PLC-BSC base
    • Control of contactors and signalling devices
    • HVAC and building automation panels
    • Electronic boards with a power contact

    Use by need

    For maintenance electricians.
    Spare relay for PLC-BSC bases – repair without rewiring the panel.
    For automation integrators.
    Together with PLC bases, it forms a compact 6.2 mm interface system.
    For electronics manufacturers.
    Can be soldered directly onto a PCB; the RT III housing withstands washing.

    Practical application

    If one relay in a panel with Phoenix Contact PLC-BSC-24DC/21 bases no longer switches its load, pull out the faulty relay and insert a new REL-MR-24DC/21 – the wiring stays untouched and the equipment is back in operation within minutes.

    Pros

    • Genuine Phoenix Contact product
    • Low coil current – 7 mA
    • Replaceable in PLC bases without disconnecting wires
    • AgSnO contacts, 6 A continuous current
    • UL, cUL and VDE approvals
    • Sealed RT III housing

    Cons / limitations

    • Cannot be mounted on a DIN rail without a base – requires a PLC series base
    • One changeover contact
    • For low signal currents (< 10 mA) choose a relay with gold-plated contacts

    Safety and installation notes

    • Replace the relay only after disconnecting the load circuit voltage.
    • Coil voltage is 24 V DC; an incorrect voltage will damage the relay.
    • Use only compatible Phoenix Contact PLC series bases.
    • Do not exceed the 6 A continuous current and 250 V switching voltage.
    • Installation must be carried out by a qualified electrician.

    Quick selection guide

    Coil: 24 V DC
    1CO (SPDT)
    6 A
    ≤ 250 V AC/DC
    For PLC bases
    Suitable when you need to:
    • replace a relay in a Phoenix Contact PLC base
    • isolate a PLC output from the load
    • build a compact 6.2 mm interface solution
    Check before use:
    • whether the base is compatible with REL-MR-…/21 relays
    • control voltage – 24 V DC
    • load current and voltage
    Important reminder: A relay is not a protective device – it does not protect against overload or short circuit.

    FAQ

    Which base does this relay fit?
    Phoenix Contact PLC series bases, e.g. PLC-BSC-24DC/21.
    What is the coil current?
    The typical coil current at 24 V DC is 7 mA.
    What load can it switch?
    Continuous contact current is 6 A, max. switching voltage is 250 V AC/DC.
    Can it be soldered onto a PCB?
    Yes, the relay has plug-in and solder pins.
    Is it suitable for low-level signals?
    The minimum switching current is 10 mA at 12 V.
    Does the relay protect against overload?
    No, the circuit must be protected by a circuit breaker or fuse.

    Plug-in relay | 24 V DC coil | 1CO (SPDT) | 6 A | 250 V AC/DC | Phoenix Contact REL-MR-24DC/21 | 2961105

    Phoenix Contact REL-MR-24DC/21 (2961105) – plug-in 24 V DC relay with a 1CO AgSnO 6 A contact for PLC series 6.2 mm bases: low coil current, replacement without disconnecting wires, UL/VDE approvals.

    Published: 2026-11-05 · Data verified against the manufacturer's 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.

  • Alternative products

    Interface relay | 4CO | 7 A | coil 24 V AC | plug-in | Finder 55.34.8.024.0040 New item  
    Interface relay | 4CO | 7 A | coil 24 V AC | plug-in | Finder 55.34.8.024.0040
    Code: 55.34.8.024.0040

    Finder 55.34.8.024.0040 – interface relay with 4CO contacts (7 A) and 24 V AC coil. For control signal isolation, contact multiplication and control of contactor and valve coils in automation panels.

    Price 4.33 € VAT incl.
    ( 3.58 € VAT excl. )
    Add to cart 
    Interface relay | 2CO | 5 A | coil 24 V DC | plug-in | OMRON MY2N 24 V DC Interface relay | 2CO | 5 A | coil 24 V DC | plug-in | OMRON MY2N 24 V DC New item  
    Interface relay | 2CO | 5 A | coil 24 V DC | plug-in | OMRON MY2N 24 V DC
    Code: MY2N 24VDC

    OMRON MY2N 24 V DC – interface relay with 2CO contacts (5 A) and 24 V DC coil. For control signal isolation, contact multiplication and control of contactor and valve coils in automation panels.

    Price 6.05 € VAT incl.
    ( 5.00 € VAT excl. )
    Add to cart 
  • privacy policy

    Information