* M5 nut (for 80A type): 3 to 4 N*m * M6 nut (for 120A type): 6 to 8 N*m * M8 nut (for 300A type): 10 to 12 N*m 3. The coils (300 A type) and contacts (all type) of the relay are polarized, so follow the connection schematic when connecting the coils and contacts. Type 300 A contains a reverse surge voltage absorption circuit; therefore a surge protector is not needed. We recommend installing a surge protector varistor (ZNR) for the 10A, 20A, 80A and 120A types. Amount of proof energy: Min. 1 J Varistor voltage: 1.5 to 2.0 times of nominal voltage Avoid using a diode as this may result in decreased cut-off capability. 4. As a general rule, do not use a relay if it has been dropped. 5. Avoid mounting the relay in strong magnetic fields (near a transformer or magnet) or close to an object that radiates heat. 6. Electrical life This relay is a high-voltage direct-current switch. In its final breakdown mode, it may lose the ability to provide the proper cut-off. Therefore, do not exceed the indicated switching capacity and life. (Please treat the relay as a product with limited life and replace it when necessary.) In the event that the relay loses cut-off ability, there is a possibility that burning may spread to surrounding parts, so configure the layout so that the power is turned off within one second. 7. Permeation life of internal gas This relay uses a hermetically encased contact (capsule contact) with gas inside. The gas has a permeation life that is affected by the temperature inside the capsule contact (ambient temperature + temperature rise due to flow of electrical current). For this reason, make sure the ambient operating temperature is between -40 and 80C -40 and +176F (300A type is Max. 85C 185F), and the ambient storage temperature is between -40 and 85C -40 and +185F. 8. If the power is turned off and then immediately on after applying the rated voltage (current) continuously to the relay's coil and contact, the resistance of the coil will increase due to a rise in the coil temperature. This causes the pick-up voltage to rise, and possibly exceed the rated pick-up voltage. In these circumstances, take measures such as reducing the load current, limiting the duration of current flow, and applying a coil voltage higher than the rated operating voltage. 9. Main contact ratings in the ratings apply to when there is a resistive load. If you are using an inductive load (L load) such that L/R > 1 ms, add surge protection in parallel with the inductive load. If this is not done, the electrical life will decrease and cut-off failure may occur. 12. As a guide, the insertion strength of the plug-in terminal into the relay tab terminal should be 40 to 70N (10A type), 40 to 80N (20A type). Please select a plug-in terminal (flat connection terminal) which comply with JIS C2809-1992. 10A type: for plate thickness 0.5mm and #187 tab terminal 20A type: for plate thickness 0.8mm and #250 tab terminal 13. Avoid excessive load applied to the terminal in case of installing such as a bus bar etc., Because it might adversely affect the opening and closing performance. 14. Use the specified connector for the connector terminal connection (80A, 120A and 300A) Yazaki Corporation 7283 - 1020 or equivalent 15. After the ON signal enters the 300A type, automatic coil current switching occurs after approximately 0.1 seconds. Do not repeatedly turn it OFF within that 0.1 seconds interval, as doing so may damage the relay. 10. For the 300 A type, drive the coil with a quick startup. (Built-in one-shot pulse generator circuit) 11. Be careful that foreign matter and oils and fats kind don't stick to the main terminal parts because it is likely to cause terminal parts to give off unusual heat. Also, please use the following materials for connected harnesses and bus bars. 10A type: Min. 2 mm2 nominal crosssectional area 20A type: Min. 3 mm2 nominal crosssectional area 80A type: Min. 15 mm2 nominal crosssectional area 120A type: Min. 38 mm2 nominal crosssectional area 300A type: Min. 100 mm2 nominal crosssectional area For Cautions for Use. ASCTB233E 201201-T Panasonic Corporation Automation Controls Business Unit industrial.panasonic.com/ac/e