Abstract:Magnetic latching relay are widely used in military and civilian electronic equipments, including aviation, aerospace, electronics, telecommunications and other fields. Its performance is vulnerable and easily being affected by external magnetic environment. The impacts from magnetic fields with different magnitudes and different directions on magnetic latching relay are analyzed. By studying the shielding effects of protective hoods with different thicknesses and different sizes, it is obtained that, increasing the thickness of shield or reducing its size can improve the shielding effect. This work can provide engineering implementation basis for electromagnetic protection of magnetic latching relay.