300A High-Voltage DC Relay for EV Charger Applications

As a professional high quality 300A High-Voltage DC Relay for EV Charger Applications manufacture, you can rest assured to buy it from our factory and we will offer you the best after-sale service and timely delivery.

Features

■ The contact part is ceramic-sealed and can meet the IP67 protection rating.

■ The insulation resistance is up to 1000 M (1000 VDC), and the dielectric withstand voltage between the

■ contact and the coil is up to 4 kV, IEC 60664-1 compliant.

■ Used for the high-voltage DC switching circuit of charging piles.

Ordering Information

1 Part number NFG300

2 Load voltage(V) 1000:1000VDC 1500:1500VDC

3 Coil voltage(V) DC:12,24

4 Contact arrangement H:1 Form A

5 Aux contact type 1A:1 Form A

6 Coil terminal form L:Wire

7 Load terminal form 4:External thread 5:Intermal thread

Main Contact Data

Auxiliary Contact Data

Performance Specificating

Coil Parameter

Notes¹. Standards test condition :

           Temperature: (23±5)℃

            Humidity: (25%~75%)RH

            Direction of measurement: Terminalsup position is standard position

Characteristics

Notes². The product storage locationshall not be exposed to corrosive gas. Avoid direct sunlight on the products.

Precautions for use :

1.The relay is a high-voltageDC switching device. In the final fault state, it may not be able to connect or cut off. Once the product can not be cut off, may lead to abnormal heat and smoke, fire or other accidents. Therefore, please avoid the use of the above specifications

(including but not limited to coil rating, load ratings and electrical life, etc.) .Please use a circuit that can quickly cut off the load In an emergency; To ensure safety, the product should be replaced regularly.

2.When the relay is used in the charging circuit, the pre-charging circuit should be added to ensure that the impact current is kept below

the rated load current of therelay. As shown in the following figure, the charging time sequence is: firstly switch on the main negative relay, then switch on the pre-filled relay, and finally switch on the main positive relay. If there is no pre-charge circuit, a transient large current

will be generated at the moment of the main relay conduction, which will cause the contact bonding of the relay to be unable tobe cut off. Please pay attention to it.

3.Contacts rating is the value under resistive load. Please take measures of surge absorption device together with inductive load when using the L/R≥ 1ms inductive load (L load),otherwise it may lead to the decrease of electrical endurance and defective switch.

4. It is recommended to install the nonlinear resistance(recommend using variable resistance) in order to suppress the reverse electromotive force of coil. But please do not use diode, otherwise it will lead to the decline of relay performance.

5. It is strictly prohibited to place the relay for a long time in the environment beyond the operating temperature (-40 85) of the product.

6.To prevent loosening, please correctly use washers when installing the relay. Use M5 screws for the relay installation, with a tightening torque controlled between 3 N ·  m and 4 N ·  m; for the load-end M6 mounting nuts, the tightening torque should also be controlled

between 6 N · m and 8 N ·  m; during the load-end nut tightening process, the axial torque should be controlled at <1 N ·  m; for the

load-end M8 mounting nuts, the tightening torque should be controlled between 9 N ·  m and 11 N ·  m . If the torque exceeds these ranges, the product may be damaged.

7.Please avoid grease and other foreign matter attached to the terminals. Please use the connection wire above 185mm2   spec, otherwise it may lead to abnormal heating of the terminals.

8.Please pay attention to the thickness of copper bars and the value of the torque. If it goes beyond the recommended values in the below table, it will cause thread slide or installation is not tight. To avoid short circuit or fire, it, s not suggest fix two copper bus bar at same side.

9. In principle, please do not use it when the relay has fallen down.