American SEL-387L protection device, SEL current differential relay
LEHIY item code: LH-SEL-0018
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This page helps you check American SEL-387L protection device, SEL current differential relay before you ask for a quote.
Confirm the brand, model number, part number, and quantity. Share a clear nameplate photo when the old item has close variants.
LEHIY can check stock, lead time, packing, shipping documents, and safe replacement options for maintenance orders.
Utilizing a 64 kbps digital communication channel, it achieves complete phase and ground fault protection through simple setup. Easy installation—set up the relay in minutes!
Only the relay and terminal are labeled, providing addresses for sending and receiving communications. Connects to 1300 nm and 1550 nm single-mode fiber without repeaters, with transmission distances up to 120 km (74 miles). No additional transceivers are required.
Differential communication—use the SEL-387L line current differential relay with multiplexed communication systems using single-mode fiber or built-in IEEE C37.94 compatible connections. Connect to EIA-422 and G.703 multiplexers using the SEL-3094 interface converter.
Three-terminal and tap changer lines—Protect three-terminal lines using two SEL-387L relays and one SEL-311L line current differential system. The sensitivity and speed of tap load protection are coordinated by setting the SEL-311L to make all protection decisions.
No settings are required for the SEL-387L relays.
Simple backup protection—Select the SEL-387L as a simple solution for discrete backup protection. Coordinated with another local relay (eg, the SEL-551 overcurrent/reclosing relay), it provides circuit breaker failure, automatic reclosing, overcurrent, and ground fault protection in addition to current differential protection.
Simple protection is applied to both end-to-end transmission lines and tap changes, each using CTs with the same transformation ratio. A 64 Kb digital communication channel enables complete phase and ground fault protection without setup.
Simple installation: Connects to 1300 and 1550 nm single-mode fiber optic cables without repeaters, achieving transmission distances up to 120 km. No additional transceivers are required. Flexible communication: Uses the built-in IEEE C37.94 compatible connection to apply the SEL-387L to multiplexed communication systems.
Connects to EIA-422 and G.703 multiplexers using the SEL-3094 interface converter. Low-cost replacement of obsolete systems: Provides comprehensive protection for both ends of the line using the SEL-387L. Saves money through low equipment costs and no setup costs.
Replaces faulty control line relays with sensitive and safe fiber optic current differential relays.
Built-in communication monitoring and alarm system improves protection quality. acSELerator software allows offline development of relay settings, writing SELogic control equations, and analyzing post-fault event reports.
Our company has a strong advantage in supplying the American SEL-387L protection device and SEL current differential relay, directly sourced from the manufacturer to ensure genuine products.
Plain language sourcing guide for American SEL-387L protection device, SEL current differential relay
Start with the full model name. Check the brand name. Check the part number. Check the code on the old unit. These small checks help you avoid a wrong order.
Take one clear photo of the front label. Take one photo of the side label. If the part has a cable, plug, port, seal, coil, or screen, take a photo of that area too.
Tell us the quantity you need. Tell us your country. Tell us the date when the plant needs the part. We can then check stock, lead time, safe packing, and the best shipping plan.
If the exact model is no longer made, do not guess. Send the old model and the use case. LEHIY can compare close options and explain which choice is safer for repair work.
Use simple order notes. Write the model in one line. Write the quantity in one line. Write the delivery country in one line. This helps our team reply faster.
Check the old part before removal. Look at the label. Look at the connector. Look at the mounting size. Look at the voltage or pressure rating if it is shown.
Do not rely on a short nickname for a part. Many industrial items have close versions. A small suffix can change the plug, output, range, or software setting.
Ask for a stock check if the plant is stopped. Ask for a lead time if the order is planned. Ask for packing photos if the part is fragile or heavy.
For a replacement order, tell us what failed. Tell us where the part is used. Tell us if an equal model is acceptable. This makes the first answer more useful.
For repeat orders, send the last invoice, old label, or old packing photo. The same reference can help us match the correct product again.
For urgent service, keep the message simple. One model, one quantity, one photo, and one delivery target are enough for a fast first check.
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| Brand Name: | SEL | Certification: | ISO9001, CE |
|---|---|---|---|
| Place of Origin: | China | Condition: | New |
| Warranty: | 1 year | Customized sourcing: | available |
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Ans. LEHIY specializes in industrial automation and control components, offering fast sourcing, stable quality, and competitive prices for global customers.
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Ans. Most items ship within 3-7 days. Customized or rare models may take 10-30 working days.
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Ans. Our main products include PLCs, sensors, valves, solenoid valves, actuators, power modules, transmitters, and complete industrial automation solutions.
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American SEL-387L protection device, SEL current differential relay
Send the brand, model, part number, quantity, nameplate photos, and application requirements. LEHIY will check availability, suitable alternatives, packing details, and delivery options before quoting.
For discontinued, temporarily unavailable, or configuration-sensitive items, our team can compare the requested model with close variants or compatible replacements for maintenance and spare parts planning.
Use this page as a practical sourcing note for engineers, buyers, and maintenance teams comparing automation components. Check the model name, brand, LEHIY code, application, and replacement requirements before sending an inquiry.
Short, clear information helps our team confirm availability faster and reduce back-and-forth communication during urgent maintenance projects.
- Confirm the complete model number and any suffix printed on the nameplate.
- Share quantity, destination country, preferred shipping method, and target delivery date.
- Include photos, drawings, old purchase records, or datasheets when compatible alternatives are acceptable.
- Ask for stock checking, replacement comparison, packing details, and export documentation before ordering.
Useful details for a faster quote
- Complete model and part number
- Required quantity and target delivery date
- Nameplate photos, drawings, or old purchase records
- Voltage, signal range, dimensions, or accessory needs
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American SEL-387L protection device, SEL current differential relay verification notes
Please send the full model number, quantity, target delivery date, and nameplate photos. These details help us check the requested product or a close replacement.
LEHIY reviews product name, part number, series, label information, and application requirements before shipment.
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