Relay installation and protection

Bolt specifications

M2.5

M3.0

M3.5

M4.0

M5.0

M6.0

Wiring

With head

0.40

0.50

0.80

1.20

2.00

2.5

Countersunk

0.20

0.25

0.40

0.70

0.8

For lead-out

0.40

0.50

1.14

2.28

4.00

8.00

For installation

-

1.00

2.00

4.20

-

9.2 Welding and cleaning
... Neutral rosin flux should be used for welding of relay terminals, and acid flux should not be used. After welding, it should be cleaned and dried in time. The circuit iron for welding should be 30~60W, the top temperature of the soldering iron should be 280~330℃, and the welding time should not exceed 3 seconds. During automatic welding, the solder temperature is 260℃ and the welding time is not more than 5 seconds. During the welding and cleaning process of non-sealed relays, do not let the flux and cleaning fluid contaminate the internal structure of the relay, while sealed relays and washable plastic-sealed relays can be immersed as a whole.

9.3 Prevent vibration amplification
... For relays with vibration resistance requirements, a reasonable choice of installation method can avoid or reduce vibration amplification. It is best to install the relay so that the direction of the impact and vibration on the relay is perpendicular to the movement direction of the relay armature. Try to avoid using relays installed with top screws or top brackets.

9 . 4. Centralized installation method of multiple relays
... When multiple relays are densely installed on the same printed circuit board or the same rack, they can generate abnormally high heat. Relays without magnetic shielding covers may also malfunction due to magnetic interference. This can be solved by reasonably designing the installation gap between each relay, or installing other components in the middle of each relay (but they must not be components that generate strong heat and strong magnetic fields, or components that are afraid of heat and magnetic interference).