html{display:none} SEL-7250 Digital Direct-Replacement Assemblies | Schweitzer Engineering Laboratories

SEL-7250

Digital Direct-Replacement Assemblies

Streamline retrofit projects with SEL digital direct-replacement assemblies for motor, generator, transformer, feeder, and metering protection applications. These complete, preassembled retrofit kits are designed to closely match the features, form factor, and terminal blocks of specific legacy products. They combine field-proven SEL devices with specialized mounting plates, interposing terminal blocks, and other hardware to ensure quick, seamless, and cost-effective upgrades.


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Upgrade Devices Across Applications—We offer digital direct-replacement assemblies for motor, generator, transformer, feeder, and metering applications.

Strengthen Systems With All-New Hardware—Legacy hardware is prone to degradation and wear that reduces the reliability of your equipment. SEL digital direct-replacement assemblies do not repurpose any existing hardware.

Simplify Installation and Configuration—Digital direct-replacement assemblies deliver an installation experience that is easy, fast, and error-free. The physical installation work for each unit can be completed within an hour—without any power tools. Panel cuts and drilling are not required; instead, each assembly fits the existing panel opening and mounting holes. Terminal block arrangements and wiring designations closely match legacy products, and SEL provides wiring marking labels with all retrofit kits.

Minimize Engineering Work—Eliminate time-intensive and costly engineering tasks, such as revising drawings and diagrams. All assembly kits include wiring diagrams, so existing documentation for your system is not required for installation.

Partner With SEL on a Turnkey Solution—We offer complete design, installation, and commissioning services for retrofit projects, saving you time and reducing costs.

Receive Comprehensive Support—All SEL products are backed by a worldwide, ten-year warranty; no-charge diagnostic and repair services; and local technical support.

Related Materials

Purpose-Built Replacements

The following assemblies are now available, providing direct replacements for a range of legacy devices. SEL Engineering Services also accommodates requests for custom assembly designs to meet specific protection, communications, and mounting requirements.

Features

    1. 1

      Local access port

    2. 2

      Mounting plate

    3. 3

      SEL-3421 Motor Relay HMI

    4. 4

      Control terminal blocks

    5. 5

      SEL-849 Motor Management Relay

    6. 6

      CT and PT terminal block

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-710 Motor Protection Relay

    2. 2

      Front mounting plate

    3. 3

      Control and RTD terminal blocks

    4. 4

      Rear mounting plate

    5. 5

      CT and PT terminal block

    6. 6

      24 Vdc power supply

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-710 Motor Protection Relay

    2. 2

      Mounting plate

    3. 3

      Preassembled frame

    4. 4

      Control and RTD terminal blocks

    5. 5

      CT and PT terminal block

    6. 6

      24 Vdc power supply

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-3421 Relay HMI

    2. 2

      Local access port

    3. 3

      Mounting plate

    4. 4

      CT terminal block

    5. 5

      SEL-849 Motor Management Relay

    6. 6

      Control and PT terminal block

    1
    2
    3
    4
    5
    6
    1. 1

      Local access port

    2. 2

      Mounting plate

    3. 3

      SEL-3421 Motor Relay HMI

    4. 4

      CT and PT terminal blocks

    5. 5

      Control terminal blocks

    6. 6

      SEL-849 Motor Management Relay

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-735 Power Quality and Revenue Meter

    2. 2

      45mm-90mm projection meter mount

    3. 3

      Mounting plate

    4. 4

      Communications terminal blocks

    5. 5

      CT and PT terminal blocks

    6. 6

      Supply terminal blocks

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-351S

    2. 2

      Reversible mounting brackets

    3. 3

      Terminal block adapter bracket

    4. 4

      Fully accessible communication ports

    1
    2
    3
    4
    1. 1

      90mm projection mount

    2. 2

      SEL-710

    3. 3

      Mounting plate

    4. 4

      Control terminal blocks

    5. 5

      24V power supply

    6. 6

      CT and PT terminal blocks

    1
    2
    3
    4
    5
    6
    1. 1

      Control terminal block

    2. 2

      SEL-751

    3. 3

      Mounting plate

    4. 4

      Control terminal blocks

    5. 5

      PT terminal blocks

    6. 6

      CT terminal blocks

    1
    2
    3
    4
    5
    6
    1. 1

      SEL-751

    2. 2

      Mounting plate

    3. 3

      Control terminal blocks

    4. 4

      CT and PT terminal blocks

    1
    2
    3
    4
    1. 1

      SEL-751

    2. 2

      Mounting plate

    3. 3

      Control terminal blocks

    4. 4

      CT and PT terminal blocks

    1
    2
    3
    4

Direct-Replacement Assembly Models

Digital Direct-Replacement Assembly Models

Details

SEL direct-replacement assemblies embody SEL best-known engineering methods and field-tested expertise in mechanical design, cable management, protection, precise time, automation, communications, and metering.

The SEL Difference

SEL uses the same world-class manufacturing principles for our direct-replacement assemblies that we use for all our industry-leading products. This allows us to design, manufacture, test, and deliver high-quality and comprehensive solutions.

Vertical integration and standardized application designs help us maintain competitive prices and quality while still meeting the highest functionality requirements and delivery within weeks—not months.

Design Validation That Guarantees Expected Performance

We build a prototype and test each application module design to ensure it meets functional specifications. This process allows our manufacturing facility to properly document processes and test manufacturing equipment for production.

Quality

We engineer, manufacture, and test our direct-replacement assemblies to ensure adequate operation before delivery.

Warranty and Support

SEL direct-replacement assemblies are supported by an unmatched ten-year warranty and the industry’s best customer service.

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.


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Common Replacements

Replacement for GE Multilin 169, 269, and 369 Relays Without RTDs

Replacement for GE Multilin 169, 269, and 369 Relays Without RTD

This assembly is equipped with the SEL-849 Motor Management Relay and the SEL-3421 Motor Relay HMI for motor applications without resistance temperature detectors (RTDs). The front of the mounting plate contains the SEL-3421 HMI and an Ethernet port for local access. The back of the plate contains the SEL-849 relay and the CT, PT, and control terminal blocks. All connections between the SEL relay and interposing terminal blocks are prewired.

Replacement for GE Multilin 169, 269, and 369 Relays With RTDs

Replacement for GE Multilin 169, 269, and 369 Relays With RTD

This assembly is equipped with the SEL-710 Motor Protection Relay for motor applications with up to ten RTDs. It consists of two components: a front mounting plate and a rear mounting plate. The front mounting plate contains the SEL-710 relay and the CT and PT terminal block. The rear mounting plate contains the control and RTD terminal blocks and a 24 Vdc power supply to provide wetting voltage. All connections between the SEL relay and interposing terminal blocks are prewired. For shallow compartment applications, two extension rings are available to projection-mount the SEL-710.

Replacement for GE Miltillin SR469 Relays

Replacement for GE Multilin SR469 Relays

This assembly is equipped with the SEL-710 Motor Protection Relay for motor applications with up to 12 RTDs. It consists of a mounting plate, frame, and terminal blocks, which all come preassembled as a single unit. The front of the mounting plate contains the SEL-710 relay. The back of the plate and the adjoining frame contain the CT, PT, control, and RTD terminal blocks and a 24 Vdc power supply to provide wetting voltage. All connections between the SEL relay and interposing terminal blocks are prewired.

Replacement for Westinghouse/CutlerHammer/Eaton IQ-1000, IQ-1000II, MP-3000, and MP-4000 Relays

Replacement for Westinghouse/CutlerHammer/Eaton IQ-1000, IQ-1000II, MP-3000, and MP-4000 Relays

This assembly is equipped with the SEL-849 Motor Management Relay and the SEL-3421 Motor Relay HMI for motor applications without RTDs. The front of the mounting plate contains the SEL-3421 HMI and an Ethernet port for local access. The back of the plate contains the SEL-849 relay and the CT, PT, and control terminal blocks. All connections between the SEL relay and interposing terminal blocks are prewired.