Magetic latching relay

A magnetic latching relay, comprising:

• a yoke assembly;
• a magnetic steel assembly;
• a contact system, comprising a movable contact spring assembly having back contact springs, an immovable contact spring assembly and a pusher pad;
• and
• a shell, comprising a bottom case having clip-shaped bosses, and an upper cover;
• wherein
• said clip-shaped bosses are formed outside two side walls of said bottom case to fasten extension ends of said movable contact springs and immovable contact springs of said immovable contact spring assembly;
• said clip-shaped bosses are supported with bolts to clamp the springs extending out of said clip-shaped bosses;
• said back contact springs are arc-shaped;
• said movable contact spring assembly stacked on one side of each movable contact spring;
• and
• each back contact spring is 59.5 mm long, 20 mm wide and 0.3±0.02 thick;
• one section of 7.6 mm longitudinal length on a root of each back contact spring constitutes a riveting part connected to a curved surface of 42 mm length;
• a distance between a center of an outer arc of the main part of each back contact spring and a corresponding chord is 1.2 mm;
• three Φ2.6 mm rivet holes are arranged on a center line 3.5 mm below a lower root of each back contact spring;
• one Φ3.5 mm rivet hole is arranged 51±0.05 mm apart from center lines of the three rivet holes of the back contact spring for riveting the contact with the movable contact spring.

A magnetic latching relay, comprising:

• a yoke assembly;
• a magnetic steel assembly;
• a contact system, comprising a movable contact spring assembly having back contact springs, an immovable contact spring assembly and a pusher pad;
• and
• a shell, comprising a bottom case having clip-shaped bosses, and an upper cover;
• wherein
• said clip-shaped bosses are formed outside two side walls of said bottom case to fasten extension ends of said movable contact springs and immovable contact springs of said immovable contact spring assembly;
• said clip-shaped bosses are supported with bolts to clamp the springs extending out of said clip-shaped bosses;
• said movable contact spring and a main part of a movable contact spring seat are connected in the shape of turnback or right angle;
• and
• each back contact spring is 59.5 mm long, 20 mm wide and 0.3±0.02 thick;
• one section of 7.6 mm longitudinal length on a root of each back contact spring constitutes a riveting part connected to a curved surface of 42 mm length;
• a distance between a center of an outer arc of the main part of each back contact spring and acorresponding chord is 1.2 mm;
• three Φ2.6 mm rivet holes are arranged on a center line 3.5 mm below a lower root of each back contact spring;
• one Φ3.5 mm rivet hole is arranged 51±0.05 mm apart from center lines of the three rivet holes of the back contact spring for riveting the contactwith the movable contact spring.