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Schweitzer Engineering SEL-551 Overcurrent and Reclosing Protection Relay
- Regular price
- $2,785.00
- Sale price
- $2,785.00
- Regular price
-
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Product Description P/N: SEL-551
Description
The Schweitzer Engineering SEL-551 is an overcurrent and reclosing relay designed to provide integrated feeder protection, monitoring, and control for electrical distribution systems. It combines multiple protective relay functions, control logic, and communication capabilities into a single compact device, reducing panel complexity and installation costs. The SEL-551 delivers dependable overcurrent protection, automatic reclosing, and advanced system monitoring for utility and industrial power applications.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Schweitzer Engineering |
| Category | Transmission Distribut. Relays |
| Part Number | SEL-551 |
| Subcategory | Phase/Voltage Loss Relay |
| Protective Relay Function | Overcurrent |
| Outputs | 5 |
| Inputs | 2 |
| Power Supply | 48/125 VDC or 125 VAC |
| Conventional Terminal Blocks | 5 A phase |
| Protection Functions | Phase, negative-sequence, residual ground, neutral overcurrent |
| Control Logic | SELogic programmable control equations |
| Communications | ASCII, Binary, Modbus RTU |
| Communication Ports | Front EIA-232, Rear EIA-232/EIA-485 |
| Event Recording | 20 oscillographic reports, 512 SER records |
| Metering | Instantaneous, peak, and demand metering |
| Configuration Software | acSELerator QuickSet SEL-5030 |
| Application | Distribution feeder protection and automatic reclosing |
| Weight | Approx. 2.3 kg |
Information About SEL-551
The SEL-551 is part of Schweitzer Engineering Laboratories' distribution protection relay portfolio, developed to replace conventional overcurrent relays, recloser controls, control switches, and associated wiring with a single intelligent device. It incorporates phase, negative-sequence, residual ground, and neutral overcurrent protection together with programmable SELogic control equations, allowing flexible protection and automation schemes. The relay supports event recording, oscillography, metering, and multiple serial communication protocols, enabling seamless integration into SCADA and substation automation systems. Typical applications include utility distribution feeders, substations, industrial power systems, distribution automation, and line recloser control where reliable protection and automatic restoration are required.
Key Features:
- Integrated overcurrent protection: Provides phase, negative-sequence, residual ground, and neutral overcurrent protection.
- Automatic reclosing: Replaces traditional line recloser control packages with an integrated solution.
- SELogic control equations: Supports programmable automation and custom protection schemes.
- Comprehensive event recording: Stores up to twenty 15-cycle oscillographic event reports and 512 SER records.
- Advanced metering: Measures instantaneous, peak, and demand electrical values.
- Multiple communication protocols: Supports ASCII, binary, and Modbus RTU communications.
- Dual serial interfaces: Includes front EIA-232 and rear EIA-232/EIA-485 communication ports.
- QuickSet software support: Compatible with acSELerator QuickSet SEL-5030 for offline configuration and analysis.
- Front-panel programmable controls: Allows customizable pushbutton operation and text displays.
- Compact relay design: Consolidates multiple protection and control functions into one device.
The SEL-551 delivers the reliability and precision required for feeder protection, automatic reclosing, and electrical distribution system control.
Description
The Schweitzer Engineering SEL-551 is an overcurrent and reclosing relay designed to provide integrated feeder protection, monitoring, and control for electrical distribution systems. It combines multiple protective relay functions, control logic, and communication capabilities into a single compact device, reducing panel complexity and installation costs. The SEL-551 delivers dependable overcurrent protection, automatic reclosing, and advanced system monitoring for utility and industrial power applications.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Schweitzer Engineering |
| Category | Transmission Distribut. Relays |
| Part Number | SEL-551 |
| Subcategory | Phase/Voltage Loss Relay |
| Protective Relay Function | Overcurrent |
| Outputs | 5 |
| Inputs | 2 |
| Power Supply | 48/125 VDC or 125 VAC |
| Conventional Terminal Blocks | 5 A phase |
| Protection Functions | Phase, negative-sequence, residual ground, neutral overcurrent |
| Control Logic | SELogic programmable control equations |
| Communications | ASCII, Binary, Modbus RTU |
| Communication Ports | Front EIA-232, Rear EIA-232/EIA-485 |
| Event Recording | 20 oscillographic reports, 512 SER records |
| Metering | Instantaneous, peak, and demand metering |
| Configuration Software | acSELerator QuickSet SEL-5030 |
| Application | Distribution feeder protection and automatic reclosing |
| Weight | Approx. 2.3 kg |
Information About SEL-551
The SEL-551 is part of Schweitzer Engineering Laboratories' distribution protection relay portfolio, developed to replace conventional overcurrent relays, recloser controls, control switches, and associated wiring with a single intelligent device. It incorporates phase, negative-sequence, residual ground, and neutral overcurrent protection together with programmable SELogic control equations, allowing flexible protection and automation schemes. The relay supports event recording, oscillography, metering, and multiple serial communication protocols, enabling seamless integration into SCADA and substation automation systems. Typical applications include utility distribution feeders, substations, industrial power systems, distribution automation, and line recloser control where reliable protection and automatic restoration are required.
Key Features:
- Integrated overcurrent protection: Provides phase, negative-sequence, residual ground, and neutral overcurrent protection.
- Automatic reclosing: Replaces traditional line recloser control packages with an integrated solution.
- SELogic control equations: Supports programmable automation and custom protection schemes.
- Comprehensive event recording: Stores up to twenty 15-cycle oscillographic event reports and 512 SER records.
- Advanced metering: Measures instantaneous, peak, and demand electrical values.
- Multiple communication protocols: Supports ASCII, binary, and Modbus RTU communications.
- Dual serial interfaces: Includes front EIA-232 and rear EIA-232/EIA-485 communication ports.
- QuickSet software support: Compatible with acSELerator QuickSet SEL-5030 for offline configuration and analysis.
- Front-panel programmable controls: Allows customizable pushbutton operation and text displays.
- Compact relay design: Consolidates multiple protection and control functions into one device.
The SEL-551 delivers the reliability and precision required for feeder protection, automatic reclosing, and electrical distribution system control.
