American SEL-551 overcurrent protection device relay
LEHIY item code: LH-SEL-0029
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Confirm the brand, model number, part number, and quantity. Share a clear nameplate photo when the old item has close variants.
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We offer remote or on-site installation and commissioning services for the American SEL-551 overcurrent relay! SEL-551 Overcurrent Relay/Reclosing Relay is sourced directly from the American SEL factory, ensuring authenticity. Group purchases offer competitive pricing. Product model: SEL-551 055100CX531X.
The American SEL-551 overcurrent/reclosing relay replaces many electrical appliances, control switches, and wiring required for traditional distribution substation protection and control panels. This relay can also replace line reclosing control packages at a fraction of the cost.
Key features of the American SEL-551 055100CX531X include: ➤ Phase, ground, and negative sequence overcurrent protection ➤ US and IEC time-based overcurrent profiles ➤ Multiple closing relay with sequence coordination ➤ Enhanced SELOGIC® control equations for creating conventional or advanced solutions ➤ Local/remote control logic switching schemes for operating circuit breakers, etc.
➤ Sequential Event Recorder (SER) logs and event reports are stored in non-volatile memory. ➤ Hardware options for installation, termination, output contacts, and communication. ➤ Demand metering. ➤ Supports ASCII, SEL LMD, and Modbus RTU protocols. ➤ Utility distribution feeders.
➤ Industrial distribution feeders – including core balancing CT input. ➤ Transformer banks – including input of a separate neutral point current transformer. ➤ Capacitors, reactors, circuit breakers, etc. ➤ Panel-mount relays optional. manufacturer, guaranteeing authenticity and providing document verification.
The new SEL-551C relay includes all the same features as the SEL-551, plus the following: ➤ New digital I/O hybrid, 6 inputs and 3 outputs ➤ 8 programmable latching control switches ➤ Programmable alarm contacts.
Adaptive overcurrent element for safe operation when the CT is saturated. The SEL-551/SEL-551C phase transient overcurrent element typically operates using the output of a cosine filter algorithm.
When the relay detects a large fault current that causes severe CT saturation, the overcurrent element can operate using an adaptive current algorithm.
Based on the level of the "harmonic distortion index," the adaptive current is either the output of the cosine filter or the output of the bipolar peak detector. the adaptive current is the output of the cosine filter.
For product details regarding the American SEL-551 055100CX531X, please contact our sales department.
Plain language sourcing guide for American SEL-551 overcurrent protection device relay
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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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American SEL-551 overcurrent protection device 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.
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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.
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