# Low-side power switch

Canonical URL: https://eloragrid.ai/symbols/low-side-power-switch
Publisher: Elora Grid
Updated: 2026-10-27
Lookup label: LS SW
Drawing use: Schematic
Reference families: Manufacturer

A low-side switch controls the return-side connection of a load in its specified circuit.

## In plain English

### What does Low-side power switch mean?

A low-side switch controls the return-side connection of a load in its specified circuit.

### A simple example

A load can remain connected to its supply while its return path is switched by a suitable device.

### What the drawings help you do

Place the switch between the load and its defined return reference. The load may remain connected to the supply even while this switch is open. Show the complete current loop so a reader does not mistake return-path switching for disconnection of every supply conductor.

### Before using this reference

- Identify the load’s permanent supply connection.
- Show the switched return path and reference.
- Reference control-drive and load-transient requirements.

### Does an open low-side switch isolate the load from the positive supply?

Not necessarily. The positive connection can remain present. The drawing must show the actual conductors being interrupted and any separate isolation arrangement.

### Terms

- Return path: The conducting path completing the selected load circuit.
- Low side: The return-side position of the switching function.

Concept diagram: Load return connection → Controlled low-side switch → Defined circuit return
Original functional explanation. Arrows show information or energy roles; two-headed arrows identify two-way interfaces. This is not a pinout, certified standards graphic or complete circuit.

- [Low-side power switching](https://www.ti.com/product-category/power-management/low-side-switches/overview.html)


## What it represents

A low-side switch controls the return-side connection of a load in its specified circuit.
A load can remain connected to its supply while its return path is switched by a suitable device.
Place the switch between the load and its defined return reference. The load may remain connected to the supply even while this switch is open. Show the complete current loop so a reader does not mistake return-path switching for disconnection of every supply conductor. This is original functional artwork, not a certified standard graphic or device pinout.

## How to read it

- Identify the load’s permanent supply connection.
- Show the switched return path and reference.
- Reference control-drive and load-transient requirements.
- Low-side switching does not necessarily isolate the load from the supply conductor.

## Information to show or reference

- Identify the load’s permanent supply connection.
- Show the switched return path and reference.
- Reference control-drive and load-transient requirements.

## Important distinction

Low-side switching does not necessarily isolate the load from the supply conductor.

## Facts

- Representation type: Original functional block; not a certified IEC or IEEE graphic
- Concept input: Load return connection
- Concept output: Defined circuit return

## Public references

- [Low-side power switching](https://www.ti.com/product-category/power-management/low-side-switches/overview.html) — Texas Instruments. Low-side power switching: public technical context for the named function. Product and compliance details remain with the publisher.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.