Audited Supplier
Protection relays
Numerical relays are based on the use of microprocessors. The first numerical relays were released in 1985.A big difference between conventional electromechanical and static relays is how the relays are wired. Electromechanical and static relays have fixed wiring and the setting is manual. Numeric relays, on the other hand, are programmable relays where the characteristics and behavior can be programmed. Most numerical relays are also multifunctional.
Feeder protection and control REF620 IEC
Technical data | |||
Dimensions | |||
| Description | Value | ||
| Width | Frame | 262.2 mm | |
| Case | 246 mm | ||
| Height | Frame | 177 mm (4U) | |
| Case | 160 mm | ||
| Depth | 201 mm | ||
| Weight | Complete protection relay | max. 5.5 kg | |
| Plug-in unit only | max. 3.0 kg | ||
Power supply | |||
| Description | Type 1 | Type 2 | |
| Nominal auxiliary voltage U n | 100, 110, 120, 220, 240 V AC, 50 and 60 Hz | 24, 30, 48, 60 V DC | |
| 48, 60, 110, 125, 220, 250 V DC | |||
| Maximum interruption time in the auxiliary DC voltage without resetting the relay | 50 ms at U n | ||
| Auxiliary voltage variation | 38...110% of U n (38...264 V AC) | 50...120% of U n (12...72 V DC) | |
| 80...120% of U n (38.4...300 V DC) | |||
| Start-up threshold | 19.2 V DC (24 V DC × 80%) | ||
| Burden of auxiliary voltage supply under quiescent (P q)/operating condition | DC <18.0 W (nominal _1)/<22.5 W (max. _2) | DC <18.5 W (nominal _1)/<22.5 W (max. _2) | |
| AC <19.0 W (nominal _1)/<23.0 W (max. _2) | |||
| Ripple in the DC auxiliary voltage | Max 15% of the DC value (at frequency of 100 Hz) | ||
| Fuse type | T4A/250 V | ||
| Energizing inputs | |||
| Description | Value | ||
| Rated frequency | 50/60 Hz | ||
| Current inputs | Rated current, In | 0.2/1 A _1, _2 | 1/5 A |
| Thermal withstand capability | |||
| 4 A | 20 A | |
| 100 A | 500 A | |
| Dynamic current withstand | |||
| 250 A | 1250 A | |
| Input impedance | <100 mΩ | <20 mΩ | |
| Voltage inputs | Rated voltage | 60...210 V AC | |
| Voltage withstand | |||
| 240 V AC | ||
| 360 V AC | ||
| Burden at rated voltage | <0.05 VA | ||
| 1 | Display | Default view can be selected from e.g. single line diagram (SLD), measurements, events |
| 2 | Self-supervision and protection indicator LEDs | Ready-LED steady: OK, Ready-LED flashing: Internal Relay Fault (IRF), Start-LED steady: protection started, Start-LED flashing: protection function blocked, Trip-LED: protection operated |
| 3 | Programmable LEDs | Can be programmed for alarming and indication as latched the signal. Flashing/steady features. |
| 4 | Control Circuit Breaker or disconnectors | Press open/close and confirm by pressing enter. If there is more than one controllable object select the object first with navigation buttons. Note: control has to be in Local mode |
| 5 | Escape / Cancel | Used for canceling actions and leaving setting mode without saving the values. Returns back to menu |
| 6 | Navigation | Left = go back, Right = go further, Up = scroll up, Down = scroll down. Up/down can also be used when selecting controllable objects like breakers and switches in single line diagram. |
| 7 | Enter / Select | Entering to parameter setting mode and confirming new values |
| 8 | Authorization | If authorization is used you can log in or log out using this button |
| 9 | Clear | Clearing events and indications, see next page for further details |
| 10 | Menu | Switch views in between the main menu, single line diagram and measurements |
| 11 | Local / Remote | Changes the control between Local/Remote |
| 12 | Help | View help messages |
| 13 | Function buttons | Can be configured as control buttons |
Our product packaging aims to provide functionality and aesthetic appeal. We understand the importance of creating a positive first impression and ensuring the safe delivery of products to customers. The following are the main features of our packaging:
Durable materials: We use high-quality materials that are sturdy and durable, and will not be damaged during transportation. This ensures that our products reach our customers in good condition.
Safe packaging: Our packaging design focuses on a safe outer shell. We use protective layers and liners to prevent any damage to the product caused by external impact or rough handling.
Clear labels: Our packaging includes clear and detailed labels. They provide necessary detailed information, such as product name, quantity, instructions for use, and any necessary warning labels. This helps customers easily identify and understand the product.
Attractive design: We believe that packaging should have visual appeal. Our design team has created a striking modern packaging design that reflects the essence of our brand. This helps our products stand out on store shelves and leave a positive impression.
Shanghai Zhongcheng Fengyuan Industrial Technology Co., Ltd. is an engineering company with a global network of engineering centers, providing high-performance and cost-effective services to global customers. We have established partnerships with most world-renowned brands and can provide components and equipment for the oil and gas, industrial, chemical, and energy industries.
The company's industrial control brand covers major global manufacturers, including but not limited to: Allen Bradley, Siemens, IFM, Beckhoff, Yaskawa, Pepperl+Fuchs, Sick, etc. The products include PLC/DCS modules, touch screens, drive inverters, industrial power supplies, I/O systems, industrial communication, low-voltage control equipment, low-voltage distribution equipment, medium voltage spare parts, protective relays, etc. We have rich industry experience, professional services, and good protective packaging.
We cooperate with various official express delivery companies to export to various parts of the world, such as South Asia, Europe, North America, South America, the Middle East, and Africa. Reducing customer costs helps to create more benefits for each of our customers
Zhongcheng Fengyuan has won the trust of a large number of customers. Our belief is to help our customer factories achieve digitization, intelligence, automation, and create maximum benefits for our customers. Looking forward to working with you! 
1. Question: How is the warranty?
Answer: All products we provide come with a 12 month warranty
2. Question: What about shipping?
Answer: They are in stock and can be shipped immediately. We can arrange shipments of DHL, FedEx, UPS, TNT, EMS at competitive prices, and of course, customers can also use their own freight forwarders.
3. Question: Why did you purchase from us?
Answer: We have over ten years of experience in the field of industrial automation. We have a team composed of qualified engineers and sales personnel, ready to meet customer needs with high-quality products at any time.
4. Question: Are other suppliers offering better prices than you?
Answer: Creating maximum benefits for customers is our belief. If you have a better price, please let us know. We will do our best to meet your price and provide support for you.
5: Q: What payment method do you accept?
Answer: Telegraphic transfer (bank transfer), Western Union transfer, credit card, PayPal, letter of credit, Alipay, cash, custody, etc.
