Can be made into an SPST switch by simply leaving one of the throw pins unconnected.ĭPST (Double-Pole, Single-Throw): Essentially a doubled SPST. Ideal for selecting between two power sources or swapping inputs. SPDT (Single-Pole, Double-Throw): A switch utilizing three terminals: one common pin, two pins vying for connection to the common (only one can be connected at a time). SPST (Single-Pole, Single-Throw): A simple switch with one input and one output. Switch will be either closed or completely disconnected. Wattmeter: Device used to measure electric power.īell: Electric bell, makes a single tone or repeated ringing sound when activated.īuzzer: Similar to an electric bell, an electric buzzer makes a constant buzz when activated. Must be connected in parallel.Īmmeter: Zero resistance device used to measure electrical current. Voltmeter: Very high resistance device used to measure electrical voltage. Iron Core Inductor: Same as above, but with an iron core beneath the coiled wire.Ĭircuit Breaker: Automatically operated electrical switch that protects electrical circuits from damage caused by short circuits or overloads. Can also be used as a transducer to convert electrical energy into mechanical energy. Passive two-terminal electrical component used to store energy in the resulting magnetic field. Inductor: Coil of wire that generates a magnetic field when electrical current is passed through it. This symbol represents low power/low voltage fuses. Used with a resistor in a timing circuit.īattery: Generates constant voltage and supplies electrical energy.įuse: Sacrificial overcurrent protection device. Can be used to filter or block DC signals while passing AC signals. Used to provide electrical shock protection and for zero potential references.Ĭapacitor: Stores electric charge. Ground: Connection to the actual ground or other “grounding” structure. Used with a capacitor in a timing circuit. Resistor: Resistors restrict the flow of current.

Industrial Symbols for Transforms Industrial Symbols for Metering Partial Glossary for Selectors Industrial Symbols for Transforms Industrial Symbols for Metering Having trouble installing your newly purchased pump? Contact Pumping Solutions, we have a great customer service staff standing by to help. Bookmark this page as a handy reference for future electrical projects. offers this guide and glossary to common industrial electrical symbols to help you correctly identify components and spot potential hazards. MTH Pumps and Regenerative Turbine Pumps.

On off switch symbol