PLC Program for Motor Starter with Low-Level Switch Interlock

Learn how to build a PLC-based motor starter with a low-level switch interlock to protect pumps from dry run. Includes ladder logic, wiring, and working principle.

2025 Jan 16

Emergency Stop Button Installation & Verification Checklist

The contactor connects to the power supply and load. When the circuit is active, the contactor supplies power to the load. When the E-stop or manual stop button is pressed,

2024 Jul 16

What are Dry Contact and Wet Contact and their differences?

A compressor contactor typically has a separate 24 V coil, and the power supply does not directly power the compressor contactor. Dry contacts are favored in such setups

2026 Feb 20

What is Auxiliary Contact and how it works with MCB?

Auxiliary contact, similar to main power contactor coils, which are rated for continuous duty throughout a plant, contain time delay elements that prevent arcing and

2024 Jan 31

What is Interposing Relay? & How it is used in PLC?

What is the difference between an Interposing Relay and a Contactor? The main utility of an interposing relay lies in controlling lower power loads within control circuits while

2024 Feb 17

What is DOL Starter?

Connection Diagram of DOL Starter 1. Main Contact A Contactor is used to connect Supply Voltage, Relay Coil, and Thermal Overload Relay.

2025 Jul 04

What is Contactor : Construction, Types and Applications

A contactor is an electromagnetic switch that is used to turn on and off an electrical circuit. Automationforum provide about contactor.

2024 Mar 10

What is Safety Relay? Why is a Normal

Operation of a Safety Relay with Master Control Contactor for 3-Phase Motor Here is an expanded step-by-step guide on the operation of a safety relay with a master control

2024 May 26

What is contactor? | Instrumentation and Control Engineering

The contactor is an electrical component that serves to connect or disconnect AC power. Contactor or often also called the relay contactor we can find on the electric control

2024 May 29

Difference Between NO and NC Contacts

Logic is constructed based on the open or closed state of switches, sensors, or relays in every control circuit and automation system. Thus, understanding the NO/NC notion

2024 Mar 09

View/Download Contactor configured for solar inverter [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.