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      X20DO4529

      Relay Output Module
      Ships by Sunday, November 8
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      B&R X20DO4529 is an X20 module with four individually isolated relay outputs and changeover contacts. It switches externally powered AC or DC loads within the specified contact ratings.
      • Manufacturer part number
        X20DO4529
      • Shipping
        Swift global dispatch
      • Condition
        New, original product
      • Shipping size (est.)
        9.5cm x 5.7cm x 1.2cm
      • Country of Origin
        Austria

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      What happens after you enquire

      • 0

        Review your reference

        Send the complete B&R X20DO4529 reference, label photographs and required quantity. Include AC/DC load requirements and the installed terminal and bus modules.

      • 1

        Confirm the offer

        Review the offered revision, condition, included items and documents against the confirmed installation.

      • 2

        Arrange dispatch

        Confirm quantity, dispatch date, lead-time start and delivery details in the quotation.

      • Match the complete marking

        Include the complete B&R X20DO4529 marking and any revision or assembly number visible on the item. Compare the changeover circuit, terminal voltage class and X20 accessory arrangement.

      • Check the offered item before ordering

        Request available label and connector photos. Have your maintenance team compare the offered X20DO4529 with the installed equipment and applicable B&R documentation.

      Technical specifications for X20DO4529

      • Manufacturer:
        B&R
      • Product Category:
        PLC Systems
      • Spare Part Number:
        X20DO4529
      • Weight:
        0.02 kg
      • Tariff Code:
        8537101190
      • Output channels:
        4
      • Contact arrangement:
        Relay changeover contacts
      • Isolation:
        Channel-to-channel, bus and I/O supply
      • DC nominal output:
        1 A at 30 VDC
      • AC nominal output:
        0.5 A at 115 VAC
      • Switching capacity:
        Maximum 30 W / 62.5 VA
      • Inrush current:
        Maximum 2 A per channel
      • Switching delay:
        ≤4 ms, ON and OFF
      • Bus power:
        0.8 W
      • Internal suppression:
        None
      • Minimum cycle:
        100 µs
      • Output register:
        USINT; bits 0–3
      • Horizontal operation:
        -25 to +60 °C
      • Vertical operation:
        -25 to +50 °C
      • Protection:
        IP20
      View as PDF Ask for Quote

      Information

      Overview Downloads Applications / Compatibility Product Precautions
      • B&R X20DO4529 gives the control application access to four changeover circuits while keeping each channel electrically isolated. Its relay contacts, external suppression and terminal voltage class must be selected together for the connected actuators.
      Contact arrangement: Four single-channel isolated changeover relays
      Nominal loads: 1 A at 30 VDC or 0.5 A at 115 VAC
      Output mapping: Four individual bits or one packed USINT
      Each channel provides NC, COM and NO terminals through the X20TB12 terminal block. The X20BM11 or X20BM15 bus module provides the supported X20 connection. Although channels are isolated, the terminal block must use either mains voltage or safety extra-low voltage; the two voltage classes must not be mixed.

      Nominal output current is 1 A at 30 VDC or 0.5 A at 115 VAC, with maximum switching capacity of 30 W or 62.5 VA. Contact resistance is 75 mΩ under the 6 VDC / 1 A test condition. Inrush current is limited to 2 A per channel. There is no internal suppression, so AC loads require an RC network or VDR and DC loads require a reverse diode, RC network or VDR as appropriate.

      The minimum bus cycle and I/O update time are 100 µs, while relay switching delay is up to 4 ms in either direction. The output state reaches the channels with a fixed offset below 60 µs relative to SyncOut; that bus timing does not remove the mechanical relay delay. Standard function model 0 supports individual output bits or a packed USINT value from 0 to 15.
      Controller platform reference: B&R X20 relay I/O. Match voltage class, contact load and output mapping.
      The original technical excerpt for B&R X20DO4529 covers contact ratings, terminal wiring, output registers and cycle limits. The separate installation guide covers voltage-class checks, suppression, contact mapping and actuator testing.
      Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
      System and supply context: The module requires an X20TB12 terminal block and a supported X20BM11 or X20BM15 bus module. Actuators use an external supply and any required load-suppression components.

      Application scope: Use changeover contacts for discrete loads within the DC or AC switching envelope. Observe the common terminal voltage-class rule even though each relay channel is isolated.
      Prepare B&R X20DO4529 for its configured installation using these checks.
      Do not mix voltage classes

      Use mains voltage or SELV on the terminal block, never a mixture.

      Remove external power

      The terminal block must not be inserted or removed while voltage is applied.

      Add suppression

      No internal protective circuit is provided; fit the appropriate AC or DC load protection.

      Check switching capacity

      Respect the voltage/current envelope, 2 A inrush limit and maximum switching power.

      Allow relay delay

      Do not treat the 100 µs bus update as the contact switching time.

      Verify all contact paths

      Test NC, COM and NO behavior for each affected channel before releasing its actuator.

      Alternative Names

      B&R X20DO4529

      Technical notes

      Engineering relationship: Electrical channel isolation does not permit mains and SELV voltage classes to be mixed on the terminal block. Isolate external actuator power before connecting or removing the terminal block.

      Installation boundary: A 100 µs bus update and a SyncOut offset below 60 µs describe data transfer. The relay contact itself has an ON/OFF switching delay up to 4 ms.

      Technical basis: B&R X20DO4529 Data Sheet, V3.20, September 2024. Values apply to X20DO4529 relay hardware under the stated load and mounting conditions. Bus cycle timing and mechanical contact response are separate specifications.

      FAQ View All FAQ

      • May X20DO4529 switch 115 VAC on one channel and SELV on another?
        No. Voltage classes must not be mixed on the terminal block. Use either the mains-voltage class or safety extra-low voltage, even though the individual channels are isolated.
      • Why is the 100 µs cycle of X20DO4529 not its relay response time?
        The cycle specifies communication and I/O updating. Mechanical contact switching can take up to 4 ms in either direction, so a fast bus cycle does not create microsecond relay operation.
      • Which protection components are needed when X20DO4529 drives inductive loads?
        There is no internal suppression. AC loads require an RC combination or VDR; DC loads can use an inverse diode, RC combination or VDR appropriate to the circuit.
      • How are the four output states packed by X20DO4529?
        With packed outputs enabled in standard function model 0, a USINT value from 0 to 15 uses bits 0–3 for channels 1–4. Otherwise the channels are individual data points.
      • Can the terminal block of X20DO4529 be disconnected with external load voltage present?
        No. Voltage may be applied only while the terminal block is connected. Remove the external supply before inserting or removing it.
      • What happens to the temperature limit when X20DO4529 is mounted vertically?
        The operating range changes from -25 to +60 °C for horizontal mounting to -25 to +50 °C for vertical mounting. Additional altitude derating applies above 2000 m.
      • Which separate connection parts are required for X20DO4529?
        Use an X20TB12 terminal block and the supported X20BM11 or X20BM15 bus module. These are separate accessories and must match the installed X20 configuration.
      • Does the 2 A inrush limit of X20DO4529 permit a continuous 2 A load?
        No. The nominal contact ratings remain 1 A at 30 VDC or 0.5 A at 115 VAC. The 2 A value is the per-channel inrush limit, not a continuous output rating.
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