Product Details
Product Description
The GE Multilin SR750 Feeder Management Relay is a multifunctional protection and control device designed for electrical feeder applications in industrial and utility systems. The SR750 offers flexible configuration options for current inputs, power supply ranges, and analog outputs, making it adaptable to diverse installation requirements.
This relay provides comprehensive overcurrent, voltage, frequency, and directional protection functions, ensuring reliable feeder operation and system stability.
Technical Specifications
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Manufacturer: GE Multilin
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Model Options: SR750 or SR760
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Phase Current Inputs: 1 A or 5 A CT secondaries
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Ground Current Inputs: 1 A or 5 A
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Sensitive Ground Current Inputs: 1 A or 5 A
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Control Power (LO Range):
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DC: 20–60 V
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AC: 20–48 V @ 48–62 Hz
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Control Power (HI Range):
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DC: 88–300 V
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AC: 70–265 V @ 48–62 Hz
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Analog Outputs: Configurable (0–1 mA, 0–5 mA, 0–10 mA, 4–20 mA)
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Breaker Closed LED: Red or Green option
Protection Functions
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Phase timed overcurrent (51P) with voltage restraint (12 curves + 2 Flexcurves)
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Ground timed overcurrent (51N)
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Phase & ground low-set overcurrent (50PL, 50NL)
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Phase & ground high-set overcurrent (50PH, 50NH)
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Directional phase and ground control
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Zero sequence protection (67P)
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Negative sequence instantaneous (46/50) and time overcurrent (46/51)
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Voltage phase reversal (47)
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Negative sequence overvoltage (59Q)
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Under/overvoltage (27-1, 27-2, 59-1, 59-2)
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Under/overfrequency (81U-1, 81U-2, 81O-1, 81O-2)
Key Features
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Flexible input/output configuration for varied system requirements
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Wide-range power supply compatibility
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Advanced feeder protection with directional and sequence elements
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Designed for industrial-grade reliability
Application Scenarios
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Industrial feeder protection and monitoring
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Utility distribution systems requiring advanced relay functions
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Integration into SCADA and energy management platforms
FAQ
Q: Can the SR750 be configured for different CT ratings?
A: Yes, it supports both 1 A and 5 A CT secondaries.
Q: What power supply ranges are available?
A: LO range (20–60 VDC, 20–48 VAC) and HI range (88–300 VDC, 70–265 VAC).
Q: Does the SR750 provide frequency protection?
A: Yes, it includes both underfrequency and overfrequency elements.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Preventing Spurious Trips in Emergency Stop Systems: A Technical Guide
In industrial automation, the Emergency Stop (E-Stop) pushbutton is the ultimate safety line. However, relying on a single Normally-Closed (NC) contact can sometimes lead to unexpected spurious trips. As a control systems engineer, I have seen these nuisance trips halt entire production lines, causing significant downtime. Understanding why these components fail and how to implement robust architecture is essential for any reliable DCS or PLC-based safety system.
Sequencing Induction Motor Control with PLC Logic: Best Practices
In modern industrial automation, controlling a group of induction motors requires precision and safety. Uncontrolled simultaneous startup of multiple large motors often causes significant voltage dips, potentially triggering protective trips. Therefore, implementing a sequential startup and shutdown strategy is essential. This approach minimizes inrush current and ensures the system operates within established power constraints. A robust PLC program serves as the ideal engine for orchestrating these sequences.
Mastering PLC Programming: Best Practices for Robust Industrial Automation
Writing clean PLC code requires discipline, especially regarding memory management. Avoid overusing SET and RESET instructions, as they often complicate debugging. If multiple rungs control the same bit, troubleshooting becomes a nightmare. Instead, focus on energizing a bit in only one location. If your logic requires complex conditions, use branches within a single rung. This approach keeps your code readable, maintainable, and significantly easier to audit during downtime.