Bird Technologies 4331 - Manual (Page 17)

On diametrically opposite sides of the Plug-In Element body are contacts to
provide dc pickup in either direction of power flow, refer to figure 2. These
contacts make connection with the spring finger of the dc jack only when the
Plug-In Element is in the precise forward or reverse position, which occurs
only when the stop pin on the element is in the lower level of the stepped
line section casting face and against its respective stop.
The Model 43P Thruline Wattmeter has the same abilities as the Model 43
with the added feature of peak power measurement capabilities. A conversion
kit (P/N 4300-400) is available to convert any standard Bird Model 43 to
peak reading capabilities. This kit comes complete with all necessary parts
and easy to follow instructions for simple and quick conversion.
Raised Stop Edge
Stop Pin
Figure 1
Stop Pin
Stop Pin
Contact
Figure 2
Stop pin and
contact
Introduction
3