Automotive Relay leadership PC792A

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Why our PC792A is the best Automotive Relay Product Highlight Automotive Relay History The ISO pin location that is the industry standard was pioneered in the latter half of the 1970s by Bosch of Germany. It is widely accepted that the original Bosch design still is the way to properly make a dependable high power automotive relay. An important part of this design is a hinged movable armature held in place and opened with a coil spring for long mechanical life. The second major part of the design is the braided copper strap that carries the power from the frame to the contacts. Many relay manufacturers have dropped the strap in favor of flat beryllium copper springs that both carry the load and operate the relay. It’s a more economical way of building the relay. Let’s look at some photos Shown at the right is the internal construction, of the accepted industry leader, Tyco’s 40/30 amp ISO automotive relay. About 4 years ago Tyco purchased the Bosch relay line. The photo shows the coil spring and braided strap. This sample happened to have an internal resistor, seen in the left view. The next photo is of the Panasonic (Aromat) CB1, 40/30 automotive relay. No braided strap and no coil spring. The power is carried by a flat beryllium copper spring and to make things even worse, the contacts are at the very top of the relay a very long way away from the relay socket. The power has to go all the way to the top of the relay and back down again.

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This next photo is of the Omron G8JN 40/30 automotive relay. The right hand view shows the two narrow beryllium copper springs that carry the entire power load. At least Omron put the relay contacts near the bottom of the relay. What is difficult to see is the narrow Strip of copper that goes from the normally open terminal up to the normally open contact. See the arrow . The next is the Song Chuan 896H. They stayed close to the Bosch design but did away with the coil spring and braided strap. Again the two narrow beryllium copper springs to carry the load. Finally, Picker’s PC792A relay. Looks a little bit like the Tyco (Bosch) design, doesn’t it. Below is the Tyco again for comparison. The only way to tell them apart, except for the resistor is that the Tyco terminals are unplated, while ours are nickel plated. Picker has sold over 4 million of these relays over the past few years and does not get any back. Why our PC792A is the best Automotive Relay (cont) Aromat and Omron terminals are plated. But if you look closely, you can see copper on the edges of their terminals. They plate the material in the flat, then punch out and form the terminals. We plate our terminals after they are formed.