Identify all the components of the Star Delta Auto & PB Starter.

A Star Delta starter is used to reduce the high starting current of a 3-phase induction motor. During startup, the motor windings are connected in a star ($\text{Y}$) configuration, which applies a reduced voltage across each winding, thus limiting the inrush current. After a set time, the starter automatically switches the motor windings to a delta ($\Delta$) configuration for normal running at full voltage and power.

The 3-phase power supply (2) enters the Main Switch (Isolator) (1). From there, it feeds the Main Contactor (4). The output of the Main Contactor (4) passes through the Overload Relay (7) to the primary windings (U1, V1, W1) of the 3-Phase Induction Motor (13).
Simultaneously, the output of the Main Contactor (4) also feeds the Delta Contactor (6). The output of the Delta Contactor (6) connects to the secondary windings (U2, V2, W2) of the motor. The Star Contactor (5) also connects to the secondary windings (U2, V2, W2) of the motor, and its output terminals are shorted together to create the star point.

The control circuit is powered via the Control Circuit MCB (Fuses) (3). Key components include:

• Stop Push Buttons (8, 10): Normally Closed (NC) contacts, used to stop the motor.
• Start Push Buttons (9, 11): Normally Open (NO) contacts, used to initiate the motor start sequence.
• Main Contactor (4), Star Contactor (5), Delta Contactor (6): Each has a coil (A1/A2) for activation and auxiliary contacts (NO/NC) for interlocking and holding.
• Timer Relay (Star-Delta Timer) (12): Controls the transition time from star to delta operation.

When a Start Push Button (9 or 11) is pressed, the Main Contactor (4) and Star Contactor (5) are energized simultaneously. The Main Contactor (4) connects the primary motor windings to the supply, while the Star Contactor (5) shorts the secondary windings, putting the motor in a star configuration. At the same time, the Timer Relay (12) starts counting.
After the set time, the Timer Relay (12) de-energizes the Star Contactor (5) and energizes the Delta Contactor (6). The Delta Contactor (6) then connects the secondary motor windings to the supply in a delta configuration, allowing the motor to run at full power. Interlocking contacts (NC contacts of Star Contactor in Delta Contactor circuit, and vice-versa) prevent both Star and Delta contactors from being energized simultaneously, ensuring safe operation. The Stop Push Buttons (8 or 10) de-energize the Main Contactor (4), which in turn stops the motor.