Frequently inquire Together

100% Genuine Stock, 24/7 Service


The RET670 offers comprehensive protection, monitoring, and control features for various types of transformers, including:

  • Two- and three-winding transformers
  • Autotransformers
  • Step-up transformers
  • Generator-transformer block units
  • Phase shifting transformers
  • Special railway transformers
  • Shunt reactors

Current Transformer Information:

  1. CT Ratio 1:

    • Ratio: 2000/5 A
    • CT Class: C800 (At max tap of 2000/5A)
    • Secondary Resistance: 0.5 Ohm (2000/5A tap)
    • Cable Loop Resistance: <2 Ohms
    • Max Fault Current: Equal to switchgear rated fault current 40 kA
  2. CT Ratio 2:

    • Ratio: 1200/5 A
    • CT Class: C800 (At max tap of 1200/5)
    • Secondary Resistance: 0.3 Ohms
    • Cable Loop Resistance: <0.1 Ohms
    • Max Fault Current: Use 15 x Irated for power transformer.
  3. CT Ratio 3:

    • Ratio: 2000/5 A
    • CT Class: C400 (At max tap of 2000/5)
    • Secondary Resistance: 0.5 Ohms (At 2000/5 Tap)
  4. CT Ratio 4:

    • Ratio: 100/5 A
    • CT Class: C200
    • Secondary Resistance: 0.1 Ohms (At 100/5 Tap)
    • Cable Loop Resistance: <0.1 Ohms
  5. CT Ratio 5:

    • Ratio: 600-300/5 A
    • CT Class: C200
    • Secondary Resistance: 0.66 ohms
    • Cable Loop Resistance: <0.1 Ohms
Is our price competitive?
Topbrands collaborates with over 50 countries worldwide. As a leading supplier in China, we can provide significant discounts to customers based on market demand.
What is the warranty period?
We offer a standard one-year warranty for all new and original items.
What payment methods do we accept?
We accept 100% T/T (Telegraphic Transfer) before shipping. For items with a lead time, a 30% deposit is required in advance, with the remaining 70% balance due before shipping. If you have an agent in China, please contact us for RMB transfer.
What is the warranty period?
We offer a standard one-year warranty for all new and original items.
What shipping methods do we use?
We primarily utilize carriers such as FedEx, DHL, UPS, BRE, etc. If you have an account with any of these carriers, you can arrange the shipping yourself. Additionally, we offer free shipping to China freight forwarders.
What is our delivery time?
Typically, delivery takes around 1-3 days after receiving the advance payment. For items with a quoted lead time, delivery will occur as per the specified lead time.
How do we package the goods?
Our packaging process involves multiple layers of protection. Initially, the product is placed in its original box, sealed with a label. Then, we add a layer of bubble wrap to safeguard against collisions during transportation. Finally, all products are securely packed in sturdy boxes for further protection.
How can customers contact us and request a quote?
Customers can inquire via email, WhatsApp, WeChat, Skype, or any preferred communication platform. Simply reach out to us, and we'll promptly provide a quote tailored to your needs.

Topbrands PLC Limited is a top supplier of genuine new PLC and DCS parts, serving over 50 countries globally. We offer high-quality products from renowned brands like Bently Nevada, Honeywell, ABB, and more. With our warehouse in China stocking up to 30,000 pieces, we ensure rapid delivery to meet urgent order needs while maintaining competitive pricing to save our customers' budgets. Learn more...

Contact Information

Maybe You Also Like

    Complementary products

      • Express Shipping

        Swift delivery to meet urgent needs.

      • Extensive Inventory

        Vast stock ensures immediate availability.

      • Quality Assurance

        Genuine, high-quality PLC & DCS parts.

      • Global Service

        Catering to clients worldwide with reliable support.