Automatic Features.—There are three methods of connecting the winding of the solenoid, or trip coil as it is called:
Figs. 2,259 to 2,262.—Elementary diagrams illustrating the various methods of electromagnetic control for circuit breakers. Fig. 2,259, overload trip; fig. 2,260, underload trip, fig. 2,261, low voltage trip; fig. 2,262, control from auxiliary circuit by means of a "relay."
- 1. In series with the main circuit;
- 2. In shunt with the main circuit;
- 3. In shunt with an auxiliary circuit.
Fig. 2,263.—Diagram of General Electric low voltage trip with tripping switch normally open.
The automatic controls arising from these connections give various kinds of protection to the circuit and are known as
- 1. Overload trip;
- 2. Underload trip;
- 3. Low voltage trip;
- 4. Auxiliary circuit trip.
