Introduction
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The REA 101_ arc protection system is designed to provide fast trip commands to all circuit breakers (CB) that may feed an arc fault in low voltage or medium voltage air-insulated metal-clad switchgears.
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In case of an arc, the fault location can be quickly identified by checking the cover area of the sensor that detected the arc.
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Two sensor types are available:
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Patented long fiber sensor that detects light along its entire length.
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Light-collecting lens-type sensors, typically distributed one per compartment.
Features
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Fast, adjustable three-phase, or two-phase and neutral overcurrent condition to ensure tripping.
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Wide area automatic or manual backlight compensation.
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Loop-type or radial sensor fiber, or lens-type sensors for arc detection.
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Two high-speed solid-state (insulated gate bipolar transistor) outputs for tripping circuit breakers.
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One heavy-duty relay output for circuit breaker failure protection (CBFP) of an upstream breaker or as an alarm output.
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Two RJ-45 type ports for connecting extension units.
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Two opto-connectors for signal transfer between central units.
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Continuous self-supervision of sensor fiber loop, operating voltages, and cabling between central and extension units.
Use of the REA 101 Relay
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The central unit REA 101 can operate:
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Independently.
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With other REA 101 central units.
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With REA 103, REA 105, and REA 107 extension units.
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REA 101 is equipped with two extension ports.
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A maximum of five extension units can be daisy-chained to each port.
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Multiple REA 101 units can be interconnected via optolinks or through REA 105 units.
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Using REA 103, REA 105, and REA 107 provides selectivity and extends the protection area further.
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REA 105 is equipped with fast trip outputs capable of opening a bus coupler.
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REA 107 includes inputs for eight lens-type sensors.
Product Condition
Factory New: New, current-production products sourced directly from the manufacturer.
New in Sealed Package: Unused products supplied in their original, factory-sealed packaging.
New in Original Package: Unused products supplied in original manufacturer packaging that was not factory-sealed.
Warranty
Products are covered by a 12-month warranty unless otherwise specified in the quotation or product listing. If a product has a quality issue, it can be exchanged within 12 months or refunded in full in cash. Contact our sales team with your order details if you require warranty assistance.
Shipping Information
In-Stock Items: Same-day dispatch is available for most in-stock orders with cleared payment received before 2:00 PM (UTC+8).
Indent Items: Typical lead time is 1–3 weeks, depending on availability and product scarcity.
Customs & Documentation
International shipments are prepared with a commercial invoice, packing list and available supporting documents. Consignee details, declared value and shipping terms are confirmed before dispatch. Tracking information is provided after shipment.
Payment
Payment is accepted by bank wire transfer only, in USD, EUR, GBP or RMB/CNY. Credit cards and credit terms are not accepted. Cleared payment is required before dispatch unless otherwise agreed in writing.
30-Day Returns
We accept return requests within 30 days of delivery for international orders, subject to our return policy.
To qualify, products must be unused, in their original condition and packaging, with proof of purchase.
How to Request a Return
Contact our sales team with your order number, product details and reason for return. Please obtain return authorization and the correct return address before shipping any items back. Returns are made by mail. Return shipping is not free. It is charged at the actual international air-freight cost based on weight and volume.
Refunds are processed according to our published return and refund policy after the returned items have been reviewed.
Quality issues
Quality issues are covered by the 12-month warranty. Within 12 months, a quality issue can be exchanged or refunded in full in cash.
For full terms, please refer to our Refund Policy.
Frequently ask questions
Click Request a Quote on the product page and provide the part number, quantity, and destination country. Our sales team will reply with availability, pricing, and estimated delivery time.
We supply original industrial automation parts in different new-product conditions, including Factory New, New in Sealed Package, and New in Original Package. The condition of each item is specified in...
Yes. We source obsolete and hard-to-find PLC, DCS, and industrial control components. Send us the exact part number and required quantity so we can check availability.
Most in-stock orders with cleared payment received before 2:00 PM (UTC+8) qualify for same-day dispatch. Indent items typically require 1–3 weeks, depending on availability.
Yes. We ship industrial automation spare parts worldwide. Shipping costs and transit times depend on the destination, package weight, dimensions, and local import requirements.
We commonly ship through DHL, FedEx, UPS, and other international courier services. The carrier is selected based on the destination, shipment size, and delivery requirements.
We accept bank wire transfers in USD, EUR, GBP, and RMB/CNY. Full cleared payment is required before shipment unless otherwise agreed in the written quotation.
Products generally include a 12-month warranty unless otherwise stated in the quotation or product listing. Contact our team with your order details for warranty assistance.
Eligible products may be returned within 30 days of delivery, subject to our return policy. Contact our team for return authorization and instructions before sending any items back.
Yes. Tracking details are provided after dispatch. Commercial invoices, packing lists, and available supporting documents are prepared for international shipments.